Faculty Profiles - SATO BUNEI

写真a

SATO BUNEI

Organization

School of Science Professor

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Degree

Doctor of Science ( The University of Tokyo )

Research Interests

Stellar Physics
Extrasolar Planet
恒星物理学
系外惑星

Research Areas

Natural Science / Astronomy

Education

The University of Tokyo Graduate School, Division of Science Department of Astronomy

- 2003

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The University of Tokyo

- 2003

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Country： Japan

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Research History

-:Tokyo Institute of Technology Global Edge Institute Assistant Professor

2007

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-:東京工業大学グローバルエッジ研究院特任助教

2007

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2005 - 2007

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:国立天文台岡山天体物理観測所研究員

2005 - 2007

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2004 - 2005

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:神戸大学大学院自然科学研究科 COE研究員

2004 - 2005

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:国立天文台研究員

2003 - 2004

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2003 - 2004

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Professional Memberships

日本天文学会

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Astronomical Society of Japan

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Papers

Direct Imaging Explorations for Companions from the Subaru/IRD Strategic Program II; Discovery of a Brown-dwarf Companion around a Nearby Mid-M-dwarf LSPM J1446+4633

Taichi Uyama, Masayuki Kuzuhara, Charles Beichman, Teruyuki Hirano, Takayuki Kotani, Qier An, Timothy D. Brandt, Markus Janson, Dimitri Mawet, Mayuko Mori, Bun'ei Sato, Denitza Stoeva, Motohide Tamura, Masataka Aizawa, Bryson Cale, Thomas Henning, Hiroyuki Tako Ishikawa, Norio Narita, Masahiro Ogihara, Aniket Sanghi, Trifon Trifonov, Jerry Xuan, Eiji Akiyama, Hiroki Harakawa, Klaus Hodapp, Masato Ishizuka, Shane Jacobson, Eiichiro Kokubo, Mihoko Konishi, Tomoyuki Kudo, Takashi Kurokawa, Jungmi Kwon, Jun Nishikawa, Masashi Omiya, Takuma Serizawa, Huan-Yu Teng, Akitoshi Ueda, Sebastien Vievard

ASTRONOMICAL JOURNAL 170 ( 5 ) 2025.11

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.3847/1538-3881/ae08b6

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High-time-cadence Spectroscopy and Photometry of Stellar Flares on M-dwarf YZ Canis Minoris with Seimei Telescope and TESS. II. Statistical Properties of Blue/Red Asymmetries in the Hα Line

Yuto Kajikiya, Kosuke Namekata, Yuta Notsu, Kai Ikuta, Hiroyuki Maehara, Bunei Sato, Daisaku Nogami

The Astrophysical Journal 985 ( 1 ) 136 - 136 2025.5

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Publishing type：Research paper (scientific journal) Publisher：American Astronomical Society

Abstract

M-dwarfs frequently produce flares, and their associated coronal mass ejections (CMEs) may threaten the habitability of close-in exoplanets. M-dwarf flares sometimes show prominence eruption signatures, observed as blue/red asymmetries in the Hα line. In Paper I, we reported four candidates of prominence eruptions, which show large diversity in their durations and velocities. In this study, we statistically investigate how blue/red asymmetries are related to their flare and starspot properties, using the data set from 27 Hα flares in Paper I and previously reported 8 Hα flares on an M-dwarf, YZ Canis Minoris. We found that these asymmetry events tend to show larger Hα flare energies compared to nonasymmetry events. In particular, five out of six blue asymmetry events are not associated with white-light flares, whereas all seven red asymmetry events are associated with white-light flares. Furthermore, their starspot distributions estimated from the Transiting Exoplanet Survey Satellite light curve show that all prominence eruption candidates occurred when starspots were located on the stellar disk center as well as on the stellar limb. These results suggest that flares with lower heating rates may have a higher association rate with prominence eruptions and/or the possibility that prominence eruptions are more detectable on the limb than on the disk center on M-dwarfs. These results provide significant insights into CMEs that can affect the habitable world around M-dwarfs.

DOI： 10.3847/1538-4357/adce7d

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Other Link： https://iopscience.iop.org/article/10.3847/1538-4357/adce7d/pdf
GAOES-RV: a high-dispersion echelle spectrograph for radial velocimetry with the 3.8 m Seimei Telescope

Bun'ei Sato, Osamu Hashimoto, Masashi Omiya, Akito Tajitsu, Hideyuki Izumiura, Satoshi Honda, Kazuya Matsubayashi, Eiji Kambe, Takuya Takarada, Hiroki Harakawa, Norio Narita, Yasunori Hori, Masanobu Kunitomo, Yuya Hayashi

Ground-based and Airborne Instrumentation for Astronomy X 157 - 157 2024.7

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Publishing type：Research paper (international conference proceedings) Publisher：SPIE

DOI： 10.1117/12.3019538

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Six-year progress of the InfraRed Doppler (IRD) instrument for the Subaru Telescope

Masayuki Kuzuhara, Takayuki Kotani, Motohide Tamura, Teruyuki Hirano, Bun'ei Sato, Masashi Omiya, Wako Aoki, Akihiko Fukui, Norio Narita, Stevanus Nugroho, Masaomi Tanaka, Hajime Kawahara, Hiroki Harakawa, Yui Kasagi, Tomoyuki Kudo, Sébastien Vievard, Takashi Kurokawa, Takuma Serizawa, Takuya Takrada, Jun Nishikawa, Akitoshi Ueda, Nobuhiko Kusakabe

Ground-based and Airborne Instrumentation for Astronomy X 84 - 84 2024.7

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Publishing type：Research paper (international conference proceedings) Publisher：SPIE

DOI： 10.1117/12.3018629

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Gliese 12 b: A Temperate Earth-sized Planet at 12 pc Ideal for Atmospheric Transmission Spectroscopy

Masayuki Kuzuhara, Akihiko Fukui, John H. Livingston, José A. Caballero, Jerome P. de Leon, Teruyuki Hirano, Yui Kasagi, Felipe Murgas, Norio Narita, Masashi Omiya, Jaume Orell-Miquel, Enric Palle, Quentin Changeat, Emma Esparza-Borges, Hiroki Harakawa, Coel Hellier, Yasunori Hori, Kai Ikuta, Hiroyuki Tako Ishikawa, Takanori Kodama, Takayuki Kotani, Tomoyuki Kudo, Juan C. Morales, Mayuko Mori, Evangelos Nagel, Hannu Parviainen, Volker Perdelwitz, Ansgar Reiners, Ignasi Ribas, Jorge Sanz-Forcada, Bun’ei Sato, Andreas Schweitzer, Hugo M. Tabernero, Takuya Takarada, Taichi Uyama, Noriharu Watanabe, Mathias Zechmeister, Néstor Abreu García, Wako Aoki, Charles Beichman, Víctor J. S. Béjar, Timothy D. Brandt, Yéssica Calatayud-Borras, Ilaria Carleo, David Charbonneau, Karen A. Collins, Thayne Currie, John P. Doty, Stefan Dreizler, Gareb Fernández-Rodríguez, Izuru Fukuda, Daniel Galán, Samuel Geraldía-González, Josafat González-Rodríguez, Yuya Hayashi, Christina Hedges, Thomas Henning, Klaus Hodapp, Masahiro Ikoma, Keisuke Isogai, Shane Jacobson, Markus Janson, Jon M. Jenkins, Taiki Kagetani, Eiji Kambe, Yugo Kawai, Kiyoe Kawauchi, Eiichiro Kokubo, Mihoko Konishi, Judith Korth, Vigneshwaran Krishnamurthy, Takashi Kurokawa, Nobuhiko Kusakabe, Jungmi Kwon, Andrés Laza-Ramos, Florence Libotte, Rafael Luque, Alberto Madrigal-Aguado, Yuji Matsumoto, Dimitri Mawet, Michael W. McElwain, Pedro Pablo Meni Gallardo, Giuseppe Morello, Sara Muñoz Torres, Jun Nishikawa, Stevanus K. Nugroho, Masahiro Ogihara, Alberto Peláez-Torres, David Rapetti, Manuel Sánchez-Benavente, Martin Schlecker, Sara Seager, Eugene Serabyn, Takuma Serizawa, Monika Stangret, Aoi Takahashi, Huan-Yu Teng, Motohide Tamura, Yuka Terada, Akitoshi Ueda, Tomonori Usuda, Roland Vanderspek, Sébastien Vievard, David Watanabe, Joshua N. Winn, Maria Rosa Zapatero Osorio

The Astrophysical Journal Letters 967 ( 2 ) L21 - L21 2024.5

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Publishing type：Research paper (scientific journal) Publisher：American Astronomical Society

Abstract

Recent discoveries of Earth-sized planets transiting nearby M dwarfs have made it possible to characterize the atmospheres of terrestrial planets via follow-up spectroscopic observations. However, the number of such planets receiving low insolation is still small, limiting our ability to understand the diversity of the atmospheric composition and climates of temperate terrestrial planets. We report the discovery of an Earth-sized planet transiting the nearby (12 pc) inactive M3.0 dwarf Gliese 12 (TOI-6251) with an orbital period (P _orb) of 12.76 days. The planet, Gliese 12 b, was initially identified as a candidate with an ambiguous P _orb from TESS data. We confirmed the transit signal and P _orb using ground-based photometry with MuSCAT2 and MuSCAT3, and validated the planetary nature of the signal using high-resolution images from Gemini/NIRI and Keck/NIRC2 as well as radial velocity (RV) measurements from the InfraRed Doppler instrument on the Subaru 8.2 m telescope and from CARMENES on the CAHA 3.5 m telescope. X-ray observations with XMM-Newton showed the host star is inactive, with an X-ray-to-bolometric luminosity ratio of . Joint analysis of the light curves and RV measurements revealed that Gliese 12 b has a radius of 0.96 ± 0.05 R _⊕, a 3σ mass upper limit of 3.9 M _⊕, and an equilibrium temperature of 315 ± 6 K assuming zero albedo. The transmission spectroscopy metric (TSM) value of Gliese 12 b is close to the TSM values of the TRAPPIST-1 planets, adding Gliese 12 b to the small list of potentially terrestrial, temperate planets amenable to atmospheric characterization with JWST.

DOI： 10.3847/2041-8213/ad3642

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Other Link： https://iopscience.iop.org/article/10.3847/2041-8213/ad3642/pdf
Revisiting planetary systems in the Okayama Planet Search Program: A new long-period planet, RV astrometry joint analysis, and a multiplicity-metallicity trend around evolved stars

Huan-Yu Teng, Bun’ei Sato, Masayuki Kuzuhara, Takuya Takarada, Masashi Omiya, Hiroki Harakawa, Hideyuki Izumiura, Eiji Kambe, Mesut Yilmaz, Ilfan Bikmaev, Selim O Selam, Timothy D Brandt, Guang-Yao Xiao, Michitoshi Yoshida, Yoichi Itoh, Hiroyasu Ando, Eiichiro Kokubo, Shigeru Ida

Publications of the Astronomical Society of Japan 2023.9

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Publishing type：Research paper (scientific journal) Publisher：Oxford University Press (OUP)

Abstract

In this study, we revisit 32 planetary systems around evolved stars observed within the framework of the Okayama Planet Search Program (OPSP) and its collaborative framework of the East Asian Planet Search Network to search for additional companions and investigate the properties of stars and giant planets in multiple-planet systems. With our latest radial velocities obtained from Okayama Astrophysical Observatory, we confirm an additional giant planet in the wide orbit of the 75 Cet system ($P_{\rm {c } } = 2051.62_{-40.47}^{+45.98}\ \rm {d}$, $M_{\rm {c } }\sin i=0.912_{-0.090}^{+0.088}\,\,M_{\rm {J } }$, and $a_{\rm {c } }=3.929_{-0.058}^{+0.052}\ \rm {au}$), along with five stars exhibiting long-term radial velocity accelerations, which indicates massive companions in the wide orbits. We also find that the radial velocity variations of several planet-harboring stars may indicate additional planet candidates, stellar activities, or other understudied sources. These stars include ϵ Tau, 11 Com, 24 Boo, 41 Lyn, 14 And, HD 32518, and ω Ser. We further constrain the orbital configuration of the HD 5608, HD 14067, HD 120084, and HD 175679 systems by combining radial velocities with astrometry, as their host central stars exhibit significant astrometric accelerations. For other systems, we simply refine their orbital parameters. Moreover, our study indicates that the OPSP planet-harboring stars are more metal poor compared to the currently known planet-harboring stars, and this is likely due to the B − V color upper limit at 1.0 for star selection in the beginning of the survey. Finally, by investigating the less massive giant planets (&lt;5 MJ) around currently known planet-harboring evolved stars, we find that metallicity positively correlates with the multiplicity and total planet mass of the system, which can be evidence for the core-accretion planet formation model.

DOI： 10.1093/pasj/psad056

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Direct Imaging Explorations for Companions around Mid–Late M Stars from the Subaru/IRD Strategic Program

Taichi Uyama, Charles Beichman, Masayuki Kuzuhara, Markus Janson, Takayuki Kotani, Dimitri Mawet, Bun’ei Sato, Motohide Tamura, Hiroyuki Tako Ishikawa, Bryson Cale, Thayne Currie, Hiroki Harakawa, Thomas Henning, Teruyuki Hirano, Klaus Hodapp, Yasunori Hori, Masato Ishizuka, Shane Jacobson, Yui Kasagi, Eiichiro Kokubo, Mihoko Konishi, Tomoyuki Kudo, Takashi Kurokawa, Nobuhiko Kusakabe, Jungmi Kwon, Masahiro Machida, Takao Nakagawa, Norio Narita, Jun Nishikawa, Masahiro Ogihara, Masashi Omiya, Takuma Serizawa, Akitoshi Ueda, Sébastien Vievard, Ji Wang

The Astronomical Journal 165 ( 4 ) 162 - 162 2023.3

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Publishing type：Research paper (scientific journal) Publisher：American Astronomical Society

Abstract

The Subaru telescope is currently performing a strategic program (SSP) using the high-precision near-infrared (NIR) spectrometer IRD to search for exoplanets around nearby mid/late M dwarfs via radial velocity (RV) monitoring. As part of the observing strategy for the exoplanet survey, signatures of massive companions such as RV trends are used to reduce the priority of those stars. However, this RV information remains useful for studying the stellar multiplicity of nearby M dwarfs. To search for companions around such “deprioritized” M dwarfs, we observed 14 IRD-SSP targets using Keck/NIRC2 with pyramid wave-front sensing at NIR wavelengths, leading to high sensitivity to substellar-mass companions within a few arcseconds. We detected two new companions (LSPM J1002+1459 B and LSPM J2204+1505 B) and two new candidates that are likely companions (LSPM J0825+6902 B and LSPM J1645+0444 B), as well as one known companion. Including two known companions resolved by the IRD fiber injection module camera, we detected seven (four new) companions at projected separations between ∼2 and 20 au in total. A comparison of the colors with the spectral library suggests that LSPM J2204+1505 B and LSPM J0825+6902 B are located at the boundary between late M and early L spectral types. Our deep high-contrast imaging for targets where no bright companions were resolved did not reveal any additional companion candidates. The NIRC2 detection limits could constrain potential substellar-mass companions (∼10–75 M_Jup) at 10 au or further. The failure with Keck/NIRC2 around the IRD-SSP stars having significant RV trends makes these objects promising targets for further RV monitoring or deeper imaging with the James Webb Space Telescope to search for smaller-mass companions below the NIRC2 detection limits.

DOI： 10.3847/1538-3881/acbf37

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Other Link： https://iopscience.iop.org/article/10.3847/1538-3881/acbf37/pdf
Absence of extended atmospheres in low-mass star radius-gap planets

Vigneshwaran Krishnamurthy, Teruyuki Hirano, Eric Gaidos, Bunei Sato, Ravi Kopparapu, Thomas Barclay, Katherine Garcia-Sage, Hiroki Harakawa, Klaus Hodapp, Shane Jacobson, Mihoko Konishi, Takayuki Kotani, Tomoyuki Kudo, Takashi Kurokawa, Masayuki Kuzuhara, Eric Lopez, Jun Nishikawa, Masashi Omiya, Joshua E Schlieder, Takuma Serizawa, Motohide Tamura, Akitoshi Ueda, Sebastien Vievard

Monthly Notices of the Royal Astronomical Society 521 ( 1 ) 1210 - 1220 2023.2

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Publishing type：Research paper (scientific journal) Publisher：Oxford University Press (OUP)

ABSTRACT

Kepler showed a paucity of planets with radii of 1.5–2 R⊕ around solar mass stars but this radius-gap has not been well studied for low-mass star planets. Energy-driven escape models like photoevaporation and core-powered mass-loss predict opposing transition regimes between rocky and non-rocky planets when compared to models depicting planets forming in gas-poor environments. Here, we present transit observations of three super-Earth sized planets in the radius-gap around low-mass stars using high-dispersion InfraRed Doppler spectrograph on the Subaru 8.2 m telescope. The planets GJ 9827 b and d orbit around a K6V star and TOI-1235 b orbits a M0.5 star. We limit any planet-related absorption in the 1083.3 nm lines of triplet He i by placing an upper-limit on the equivalent width of 14.71, 18.39, and 1.44 mÅ for GJ 9827 b (99 per cent confidence), GJ 9827 d (99 per cent confidence), and TOI-1235 b (95 per cent confidence), respectively. Using a Parker wind model, we cap the mass-loss at &gt;0.25 M⊕ Gyr−1 and &gt;0.2 M⊕ Gyr−1 for GJ 9827 b and d, respectively (99 per cent confidence), and &gt;0.05 M⊕ Gyr−1 for TOI-1235 b (95 per cent confidence) for a representative wind temperature of 5000 K. Our observed results for the three planets are more consistent with the predictions from photoevaporation and/or core-powered mass-loss models than the gas-poor formation models. However, more planets in the radius-gap regime around the low-mass stars are needed to robustly predict the atmospheric evolution in planets around low-mass stars.

DOI： 10.1093/mnras/stad404

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Other Link： https://academic.oup.com/mnras/article-pdf/521/1/1210/49503239/stad404.pdf
A close-in planet orbiting giant star HD 167768

Huan-Yu Teng, Bun'ei Sato, Masanobu Kunitomo, Takuya Takarada, Masashi Omiya, Hiroki Harakawa, Guang-Yao Xiao, Yu-Juan Liu, Hideyuki Izumiura, Eiji Kambe, Michitoshi Yoshida, Yoichi Itoh, Hiroyasu Ando, Eiichiro Kokubo, Shigeru Ida

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 75 ( 1 ) 169 - 176 2023.2

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1093/pasj/psac097

Web of Science

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A trio of giant planets orbiting evolved star HD 184010

Huan-Yu Teng, Bun'ei Sato, Takuya Takarada, Masashi Omiya, Hiroki Harakawa, Makiko Nagasawa, Ryo Hasegawa, Hideyuki Izumiura, Eiji Kambe, Michitoshi Yoshida, Yoichi Itoh, Hiroyasu Ando, Eiichiro Kokubo, Shigeru Ida

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 74 ( 6 ) 1309 - 1328 2022.12

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1093/pasj/psac070

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A super-Earth orbiting near the inner edge of the habitable zone around the M4.5 dwarf Ross 508

Hiroki Harakawa, Takuya Takarada, Yui Kasagi, Teruyuki Hirano, Takayuki Kotani, Masayuki Kuzuhara, Masashi Omiya, Hajime Kawahara, Akihiko Fukui, Yasunori Hori, Hiroyuki Tako Ishikawa, Masahiro Ogihara, John Livingston, Timothy D. Brandt, Thayne Currie, Wako Aoki, Charles A. Beichman, Thomas Henning, Klaus Hodapp, Masato Ishizuka, Hideyuki Izumiura, Shane Jacobson, Markus Janson, Eiji Kambe, Takanori Kodama, Eiichiro Kokubo, Mihoko Konishi, Vigneshwaran Krishnamurthy, Tomoyuki Kudo, Takashi Kurokawa, Nobuhiko Kusakabe, Jungmi Kwon, Yuji Matsumoto, Michael W. McElwain, Koyu Mitsui, Takao Nakagawa, Norio Narita, Jun Nishikawa, Stevanus K. Nugroho, Eugene Serabyn, Takuma Serizawa, Aoi Takahashi, Akitoshi Ueda, Taichi Uyama, Sebastien Vievard, Ji Wang, John Wisniewski, Motohide Tamura, Bun'ei Sato

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 74 ( 4 ) 904 - 922 2022.8

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1093/pasj/psac044

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Direct-imaging Discovery and Dynamical Mass of a Substellar Companion Orbiting an Accelerating Hyades Sun-like Star with SCExAO/CHARIS* Reviewed

Masayuki Kuzuhara, Thayne Currie, Takuya Takarada, Timothy D. Brandt, Bun’ei Sato, Taichi Uyama, Markus Janson, Jeffrey Chilcote, Taylor Tobin, Kellen Lawson, Yasunori Hori, Olivier Guyon, Tyler D. Groff, Julien Lozi, Sebastien Vievard, Ananya Sahoo, Vincent Deo, Nemanja Jovanovic, Kyohoon Ahn, Frantz Martinache, Nour Skaf, Eiji Akiyama, Barnaby R. Norris, Mickaël Bonnefoy, Krzysztof G. Hełminiak, Tomoyuki Kudo, Michael W. McElwain, Matthias Samland, Kevin Wagner, John Wisniewski, Gillian R. Knapp, Jungmi Kwon, Jun Nishikawa, Eugene Serabyn, Masahiko Hayashi, Motohide Tamura

The Astrophysical Journal Letters 934 ( 2 ) L18 - L18 2022.7

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Astronomical Society

Abstract

We present the direct-imaging discovery of a substellar companion in orbit around a Sun-like star member of the Hyades open cluster. So far, no other substellar companions have been unambiguously confirmed via direct imaging around main-sequence stars in Hyades. The star HIP 21152 is an accelerating star as identified by the astrometry from the Gaia and Hipparcos satellites. We detected the companion, HIP 21152 B, in multiple epochs using the high-contrast imaging from SCExAO/CHARIS and Keck/NIRC2. We also obtained the stellar radial-velocity data from the Okayama 188 cm telescope. The CHARIS spectroscopy reveals that HIP 21152 B’s spectrum is consistent with the L/T transition, best fit by an early T dwarf. Our orbit modeling determines the semimajor axis and the dynamical mass of HIP 21152 B to be 17.5${}_{-3.8}^{+7.2}$ au and 27.8${}_{-5.4}^{+8.4}$M_Jup, respectively. The mass ratio of HIP 21152 B relative to its host is ≈2%, near the planet/brown dwarf boundary suggested by recent surveys. Mass estimates inferred from luminosity-evolution models are slightly higher (33–42 M_Jup). With a dynamical mass and a well-constrained age due to the system’s Hyades membership, HIP 21152 B will become a critical benchmark in understanding the formation, evolution, and atmosphere of a substellar object as a function of mass and age. Our discovery is yet another key proof of concept for using precision astrometry to select direct-imaging targets.

DOI： 10.3847/2041-8213/ac772f

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Other Link： https://iopscience.iop.org/article/10.3847/2041-8213/ac772f/pdf
Regular radial velocity variations in nine G- and K-type giant stars: Eight planets and one planet candidate

Huan-Yu Teng, Bun'ei Sato, Takuya Takarada, Masashi Omiya, Hiroki Harakawa, Hideyuki Izumiura, Eiji Kambe, Yoichi Takeda, Michitoshi Yoshida, Yoichi Itoh, Hiroyasu Ando, Eiichiro Kokubo

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 74 ( 1 ) 92 - 127 2022.2

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1093/pasj/psab112

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Elemental Abundances of nearby M Dwarfs Based on High-resolution Near-infrared Spectra Obtained by the Subaru/IRD Survey: Proof of Concept

Hiroyuki Tako Ishikawa, Wako Aoki, Teruyuki Hirano, Takayuki Kotani, Masayuki Kuzuhara, Masashi Omiya, Yasunori Hori, Eiichiro Kokubo, Tomoyuki Kudo, Takashi Kurokawa, Nobuhiko Kusakabe, Norio Narita, Jun Nishikawa, Masahiro Ogihara, Akitoshi Ueda, Thayne Currie, Thomas Henning, Yui Kasagi, Jared R. Kolecki, Jungmi Kwon, Masahiro N. Machida, Michael W. McElwain, Takao Nakagawa, Sebastien Vievard, Ji Wang, Motohide Tamura, Bun'ei Sato

ASTRONOMICAL JOURNAL 163 ( 2 ) 2022.2

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.3847/1538-3881/ac3ee0

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Nondetection of Helium in the Upper Atmospheres of TRAPPIST-1b, e, and f*

Vigneshwaran Krishnamurthy, Teruyuki Hirano, Gumundur Stefánsson, Joe P. Ninan, Suvrath Mahadevan, Eric Gaidos, Ravi Kopparapu, Bunei Sato, Yasunori Hori, Chad F. Bender, Caleb I. Cañas, Scott A. Diddams, Samuel Halverson, Hiroki Harakawa, Suzanne Hawley, Fred Hearty, Leslie Hebb, Klaus Hodapp, Shane Jacobson, Shubham Kanodia, Mihoko Konishi, Takayuki Kotani, Adam Kowalski, Tomoyuki Kudo, Takashi Kurokawa, Masayuki Kuzuhara, Andrea Lin, Marissa Maney, Andrew J. Metcalf, Brett Morris, Jun Nishikawa, Masashi Omiya, Paul Robertson, Arpita Roy, Christian Schwab, Takuma Serizawa, Motohide Tamura, Akitoshi Ueda, Sébastien Vievard, John Wisniewski

The Astronomical Journal 162 ( 3 ) 82 - 82 2021.9

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Publishing type：Research paper (scientific journal) Publisher：American Astronomical Society

DOI： 10.3847/1538-3881/ac0d57

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Other Link： https://iopscience.iop.org/article/10.3847/1538-3881/ac0d57/pdf
The South Africa Near-Infrared Doppler (SAND) instrument: concept and instrument design Reviewed

Aoi Takahashi, Takayuki Kotani, Jun Nishikawa, Akitoshi Ueda, Masayuki Kuzuhara, Motohide Tamura, Takahiro Nagayama, Mikio Kurita, Takahiro Sumi, Tomoyasu Yamamuro, Bun'ei Sato, Teruyuki Hirano, Masashi Omiya

Ground-based and Airborne Instrumentation for Astronomy VIII 2020.12

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Publishing type：Research paper (international conference proceedings) Publisher：SPIE

DOI： 10.1117/12.2560342

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Precision radial velocity measurements by the forward-modeling technique in the near-infrared†

Teruyuki Hirano, Masayuki Kuzuhara, Takayuki Kotani, Masashi Omiya, Tomoyuki Kudo, Hiroki Harakawa, Sébastien Vievard, Takashi Kurokawa, Jun Nishikawa, Motohide Tamura, Klaus Hodapp, Masato Ishizuka, Shane Jacobson, Mihoko Konishi, Takuma Serizawa, Akitoshi Ueda, Eric Gaidos, Bun’ei Sato

Publications of the Astronomical Society of Japan 72 ( 6 ) 93 2020.9

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Publisher：Oxford University Press (OUP)

<jats:title>Abstract</jats:title>
<jats:p>Precision radial velocity (RV) measurements in the near-infrared are a powerful tool to detect and characterize exoplanets around low-mass stars or young stars with higher magnetic activity. However, the presence of strong telluric absorption lines and emission lines in the near-infrared that significantly vary in time can prevent extraction of RV information from these spectra by classical techniques, which ignore or mask the telluric lines. We present a methodology and pipeline to derive precision RVs from near-infrared spectra using a forward-modeling technique. We applied this to spectra with a wide wavelength coverage (Y, J, and H bands, simultaneously), taken by the InfraRed Doppler (IRD) spectrograph on the Subaru 8.2 m telescope. Our pipeline extracts the instantaneous instrumental profile of the spectrograph for each spectral segment, based on a reference spectrum of the laser-frequency comb that is injected into the spectrograph simultaneously with the stellar light. These profiles are used to derive the intrinsic stellar template spectrum, which is free from instrumental broadening and telluric features, as well as model and fit individual observed spectra in the RV analysis. Implementing a series of numerical simulations using theoretical spectra that mimic IRD data, we test the pipeline and show that IRD can achieve <2 m s−1 precision for slowly rotating mid-to-late M dwarfs with a signal-to-noise ratio ≳100 per pixel at 1000 nm. Dependences of RV precision on various stellar parameters (e.g., Teff, vsin i, [Fe/H]) and the impact of telluric-line blendings on the RV accuracy are discussed through the mock spectra analyses. We also apply the RV-analysis pipeline to the observed spectra of GJ 699 and TRAPPIST-1, demonstrating that the spectrograph and the pipeline are capable of an RV accuracy of <3 m s−1 at least on a time-scale of a few months.</jats:p>

DOI： 10.1093/pasj/psaa085

DOI： 10.3847/2041-8213/abec71_references_DOI_TxcFCVzMr1a1zfPprKbTBDuRyKu

CiNii Research

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Other Link： https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19K14783/
Earth's atmosphere's lowest layers probed during a lunar eclipse

Kiyoe Kawauchi, Norio Narita, Bun'ei Sato, Teruyuki Hirano, Yui Kawashima, Taishi Nakamoto, Takuya Yamashita, Motohide Tamura

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 70 ( 5 ) 2018.10

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DOI： 10.1093/pasj/psy079

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Planets around the evolved stars 24 Boötis and $γ$ Libra: A 30 d-period planet and a double giant-planet system in possible 7:3 MMR Reviewed

Takarada} T, Sato} B, Omiya} M, Harakawa} H, Nagasawa} M, Izumiura} H, Kambe} E, Takeda} Y, Yoshida} M, Itoh} Y, Ando} H, Kokubo} E, Ida} S

\pasj 70 59 2018.8

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DOI： 10.1093/pasj/psy052

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Search for companions in visual binary systems using precise radial-velocity measurements

Noriyuki Katoh, Yoichi Itoh, Bun’ei Sato

Publications of the Astronomical Society of Japan 70 ( 4 ) 60 2018.5

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Publishing type：Research paper (scientific journal) Publisher：Oxford University Press (OUP)

<jats:title>Abstract</jats:title>
<jats:p>The frequency of triple and quadruple systems is considered to be high in the early phase of star formation. Some multiple systems decay in the pre-main-sequence phase. The multiplicity of main-sequence stars provides clues about the evolution of binary systems. This work searched for companions of five components of visual binary systems using precise radial-velocity measurements. Their radial velocities were monitored from 2007 to 2012 using the HIgh Dispersion Echelle Spectrograph (HIDES) installed on the Okayama Astrophysical Observatory (OAO) 1.88 m reflector. In combination with previous work, this work searched for companions with an orbital period of less than 9 yr for the five bodies. We found periodic variations in the radial velocities for ADS 6190 A and BDS 10966A. The radial velocities of ADS 7311 A, 31 Dra A, and 31 Dra B show significant trends. ADS 6190 A is an SB1 binary with an orbital period of 366.2 d. The minimum mass of the secondary star is 0.5$^{+0.7}_{-0.2}\,M_{\odot }$. The radial velocity of ADS 7311 A was monitored for an observational span of 3200 d. We rejected a planetary-mass companion as the cause of a decreasing trend in the radial velocity of ADS 7311 A. This work confirmed that the periodic variation in the radial velocity of BDS 10966 A is 771.1 d. Bisector analysis did not reveal a correlation between the asymmetry of a spectral line and the radial velocity of BDS 10966 A. We rejected nonradial oscillation of the photosphere as the source of the radial velocity variation. The variation may be caused by the rotational modulation owing to surface inhomogeneity. The orbital elements of 31 Dra A derived in this paper are consistent with those in a previous paper. 31 Dra A system is an SB1 binary with a minimum mass ratio of 0.30 ± 0.08. 31 Dra B exhibits a periodic variation in radial velocity. The orbital elements derived in this work are consistent with those reported previously by others. The variation is caused by a circumstellar planet.</jats:p>

DOI： 10.1093/pasj/psy054

DOI： 10.1093/pasj/psaa107_references_DOI_aIzuUeiDp8ChR3l5qQa0FQHVyo9

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Other Link： https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17K05390/
Exoplanets around Low-mass Stars Unveiled by K2

Teruyuki Hirano, Fei Dai, Davide Gandolfi, Akihiko Fukui, John H. Livingston, Kohei Miyakawa, Michael Endl, William D. Cochran, Francisco J. Alonso-Floriano, Masayuki Kuzuhara, David Montes, Tsuguru Ryu, Simon Albrecht, Oscar Barragan, Juan Cabrera, Szilard Csizmadia, Hans Deeg, Philipp Eigmueller, Anders Erikson, Malcolm Fridlund, Sascha Grziwa, Eike W. Guenther, Artie P. Hatzes, Judith Korth, Tomoyuki Kudo, Nobuhiko Kusakabe, Norio Narita, David Nespral, Grzegorz Nowak, Martin Paetzold, Enric Palle, Carina M. Persson, Jorge Prieto-Arranz, Heike Rauer, Ignasi Ribas, Bun'ei Sato, Alexis M. S. Smith, Motohide Tamura, Yusuke Tanaka, Vincent Van Eylen, Joshua N. Winn

ASTRONOMICAL JOURNAL 155 ( 3 ) 2018.3

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DOI： 10.3847/1538-3881/aaa9c1

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A Jupiter-mass planet around the K0 giant HD 208897 Reviewed

M. Yilmaz, B. Sato, I. Bikmaev, S. O. Selam, H. Izumiura, V. Keskin, E. Kambe, S. S. Melnikov, A. Galeev, I. Ozavci, E. N. Irtuganov, R. Ya. Zhuchkov

ASTRONOMY & ASTROPHYSICS 608 2017.11

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DOI： 10.1051/0004-6361/201731184

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The K2-ESPRINT project. VI. K2-105 b, a hot Neptune around a metal-rich G-dwarf Reviewed

Norio Narita, Teruyuki Hirano, Akihiko Fukui, Yasunori Hori, Fei Dai, Liang Yu, John Livingston, Tsuguru Ryu, Grzegorz Nowak, Masayuki Kuzuhara, Bun'ei Sato, Yoichi Takeda, Simon Albrecht, Tomoyuki Kudo, Nobuhiko Kusakabe, Enric Palle, Ignasi Ribas, Motohide Tamura, Vincent Van Eylen, Joshua N. Winn

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 69 ( 2 ) 2017.4

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DOI： 10.1093/pasj/psx002

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THE K2-ESPRINT PROJECT IV. A HOT JUPITER IN A PROGRADE ORBIT WITH A POSSIBLE STELLAR COMPANION Reviewed

Teruyuki Hirano, Grzegorz Nowak, Masayuki Kuzuhara, Enric Palle, Fei Dai, Liang Yu, Vincent Van Eylen, Yoichi Takeda, Timothy D. Brandt, Norio Narita, Sergio Velasco, Jorge Prieto Arranz, Roberto Sanchis-Ojeda, Joshua N. Winn, Tomoyuki Kudo, Nobuhiko Kusakabe, Akihiko Fukui, Bun'ei Sato, Simon Albrecht, Ignasi Ribas, Tsuguru Ryu, Motohide Tamura

ASTROPHYSICAL JOURNAL 825 ( 1 ) 2016.7

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DOI： 10.3847/0004-637X/825/1/53

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HIGH-CONTRAST IMAGING OF INTERMEDIATE-MASS GIANTS WITH LONG-TERM RADIAL VELOCITY TRENDS Reviewed

Tsuguru Ryu, Bun'ei Sato, Masayuki Kuzuhara, Norio Narita, Yasuhiro H. Takahashi, Taichi Uyama, Tomoyuki Kudo, Nobuhiko Kusakabe, Jun Hashimoto, Masashi Omiya, Hiroki Harakawa, Lyu Abe, Hiroyasu Ando, Wolfgang Brandner, Timothy D. Brandt, Joseph C. Carson, Thayne Currie, Sebastian Egner, Markus Feldt, Miwa Goto, Carol A. Grady, Olivier Guyon, Yutaka Hayano, Masahiko Hayashi, Saeko S. Hayashi, Krzysztof G. Helminiak, Thomas Henning, Klaus W. Hodapp, Shigeru Ida, Miki Ishii, Yoichi Itoh, Masanori Iye, Hideyuki Izumiura, Markus Janson, Eiji Kambe, Ryo Kandori, Gillian R. Knapp, Eiichiro Kokubo, Jungmi Kwon, Taro Matsuo, Satoshi Mayama, Michael W. McElwain, Kyle Mede, Shoken Miyama, Jun-Ichi Morino, Amaya Moro-Martin, Tetsuo Nishimura, Tae-Soo Pyo, Eugene Serabyn, Takuya Suenaga, Hiroshi Suto, Ryuji Suzuki, Michihiro Takami, Naruhisa Takato, Yoichi Takeda, Hiroshi Terada, Christian Thalmann, Edwin L. Turner, Makoto Watanabe, John Wisniewski, Toru Yamada, Michitoshi Yoshida, Hideki Takami, Tomonori Usuda, Motohide Tamura

ASTROPHYSICAL JOURNAL 825 ( 2 ) 2016.7

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DOI： 10.3847/0004-637X/825/2/127

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A PAIR OF GIANT PLANETS AROUND THE EVOLVED INTERMEDIATE-MASS STAR HD 47366: MULTIPLE CIRCULAR ORBITS OR A MUTUALLY RETROGRADE CONFIGURATION Reviewed

Bun'ei Sato, Liang Wang, Yu-Juan Liu, Gang Zhao, Masashi Omiya, Hiroki Harakawa, Makiko Nagasawa, Robert A. Wittenmyer, Paul Butler, Nan Song, Wei He, Fei Zhao, Eiji Kambe, Kunio Noguchi, Hiroyasu Ando, Hideyuki Izumiura, Norio Okada, Michitoshi Yoshida, Yoichi Takeda, Yoichi Itoh, Eiichiro Kokubo, Shigeru Ida

ASTROPHYSICAL JOURNAL 819 ( 1 ) 2016.3

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DOI： 10.3847/0004-637X/819/1/59

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A PAIR OF GIANT PLANETS AROUND THE EVOLVED INTERMEDIATE-MASS STAR HD 47366: MULTIPLE CIRCULAR ORBITS OR A MUTUALLY RETROGRADE CONFIGURATION Reviewed

Bun'ei Sato, Liang Wang, Yu-Juan Liu, Gang Zhao, Masashi Omiya, Hiroki Harakawa, Makiko Nagasawa, Robert A. Wittenmyer, Paul Butler, Nan Song, Wei He, Fei Zhao, Eiji Kambe, Kunio Noguchi, Hiroyasu Ando, Hideyuki Izumiura, Norio Okada, Michitoshi Yoshida, Yoichi Takeda, Yoichi Itoh, Eiichiro Kokubo, Shigeru Ida

The Astrophysical Journal 819 ( 1 ) 59 2016.2

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DOI： 10.3847/0004-637x/819/1/59

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SODIUM ABSORPTION SYSTEMS TOWARD SN Ia 2014J ORIGINATE ON INTERSTELLAR SCALES Reviewed

K. Maeda, A. Tajitsu, K. S. Kawabata, R. J. Foley, S. Honda, Y. Moritani, M. Tanaka, O. Hashimoto, M. Ishigaki, J. D. Simon, M. M. Phillips, M. Yamanaka, D. Nogami, A. Arai, W. Aoki, K. Nomoto, D. Milisavljevic, P. A. Mazzali, A. M. Soderberg, M. Schramm, B. Sato, H. Harakawa, N. Morrell, N. Arimoto

ASTROPHYSICAL JOURNAL 816 ( 2 ) 57 2016.1

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DOI： 10.3847/0004-637X/816/2/57

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FIVE NEW EXOPLANETS ORBITING THREE METAL-RICH, MASSIVE STARS: TWO-PLANET SYSTEMS INCLUDING LONG-PERIOD PLANETS AND AN ECCENTRIC PLANET Reviewed

Hiroki Harakawa, Bun'ei Sato, Masashi Omiya, Debra A. Fischer, Yasunori Hori, Shigeru Ida, Eiji Kambe, Michitoshi Yoshida, Hideyuki Izumiura, Hisashi Koyano, Shogo Nagayama, Yasuhiro Shimizu, Norio Okada, Kiichi Okita, Akihiro Sakamoto, Tomoyasu Yamamuro

ASTROPHYSICAL JOURNAL 806 ( 1 ) 2015.6

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DOI： 10.1088/0004-637X/806/1/5

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PRECISE RADIAL VELOCITY MEASUREMENTS FOR KEPLER GIANTS HOSTING PLANETARY CANDIDATES: KEPLER-91 AND KOI-1894 Reviewed

Bun'ei Sato, Teruyuki Hirano, Masashi Omiya, Hiroki Harakawa, Atsushi Kobayashi, Ryo Hasegawa, Takuya Takarada, Kiyoe Kawauchi, Kento Masuda

ASTROPHYSICAL JOURNAL 802 ( 1 ) 2015.3

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DOI： 10.1088/0004-637X/802/1/57

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Detection of solar-like oscillations in the bright red giant stars gamma Piscium and theta(1) Tauri from a 190-day high-precision spectroscopic multi-site campaign Reviewed

P. G. Beck, E. Kambe, M. Hillen, E. Corsaro, H. VanWinckel, E. Moravveji, J. De Ridder, S. Bloemen, S. Saesen, P. Mathias, P. Degroote, T. Kallinger, T. Verhoelst, H. Ando, F. Carrier, B. Acke, R. Oreiro, A. Miglio, P. Eggenberger, B. Sato, K. Zwintz, P. I. Papics, P. Marcos-Arenal, S. A. Sans Fuentes, V. S. Schmid, C. Waelkens, R. Ostensen, J. M. Matthews, M. Yoshida, H. Izumiura, H. Koyano, S. Nagayama, Y. Shimizu, N. Okada, K. Okita, A. Sakamoto, T. Yamamuro, C. Aerts

ASTRONOMY & ASTROPHYSICS 573 2015.1

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DOI： 10.1051/0004-6361/201323019

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Transiting Exoplanet Survey Satellite

George R. Ricker, Joshua N. Winn, Roland Vanderspek, David W. Latham, Gaspar A. Bakos, Jacob L. Bean, Zachory K. Berta-Thompson, Timothy M. Brown, Lars Buchhave, Nathaniel R. Butler, R. Paul Butler, William J. Chaplin, David Charbonneau, Jorgen Christensen-Dalsgaard, Mark Clampin, Drake Deming, John Doty, Nathan De Lee, Courtney Dressing, Edward W. Dunham, Michael Endl, Francois Fressin, Jian Ge, Thomas Henning, Matthew J. Holman, Andrew W. Howard, Shigeru Ida, Jon M. Jenkins, Garrett Jernigan, John Asher Johnson, Lisa Kaltenegger, Nobuyuki Kawai, Hans Kjeldsen, Gregory Laughlin, Alan M. Levine, Douglas Lin, Jack J. Lissauer, Phillip MacQueen, Geoffrey Marcy, Peter R. McCullough, Timothy D. Morton, Norio Narita, Martin Paegert, Enric Palle, Francesco Pepe, Joshua Pepper, Andreas Quirrenbach, Stephen A. Rinehart, Dimitar Sasselov, Bun'ei Sato, Sara Seager, Alessandro Sozzetti, Keivan G. Stassun, Peter Sullivan, Andrew Szentgyorgyi, Guillermo Torres, Stephane Udry, Joel Villasenor

JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS 1 ( 1 ) 2015.1

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DOI： 10.1117/1.JATIS.1.1.014003

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Extra-solar planets exploration using frequency comb: Infrared Doppler instrument for the Subaru telescope (IRD) Reviewed

Motohide Tamura, Takayuki Kotani, Jun Nishikawa, Takashi Kurokawa, Ken Kashiwagi, Hiroshi Suto, Bun'ei Sato, Wak Aoki, Tomonori Usuda, Shogo Nishiyama, Yuji Ikeda, Donald B. Hall, Klaus W. Hodapp, Shane Jacobson, Jun-Ichi Morino, Yasushi Okuyama, Yoichi Tanaka, Shoya Suzuki, Sadahiro Inoue, Jungmi Kwon, Dehyun Oh, Haruka Baba, Jun Hashimoto, Tomoyuki Kudo, Nobuhiko Kusakabe, Masashi Omiya, Tomoyasu Yamamuro

2015 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC) 2015

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A long-period eccentric substellar companion to the evolved intermediate-mass star HD 14067 Reviewed

Liang Wang, Bun'ei Sato, Masashi Omiya, Hiroki Harakawa, Yujuan Liu, Nan Song, Wei He, Xiaoshu Wu, Hideyuki Izumiura, Eiji Kambe, Yoichi Takeda, Michitoshi Yoshida, Yoichi Itoh, Hiroyasu Ando, Eiichiro Kokubo, Shigeru Ida, Gang Zhao

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 66 ( 6 ) 118 2014.12

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1093/pasj/psu113

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Infrared Doppler instrument (IRD) for the Subaru telescope to search for Earth-like planets around nearby M-dwarfs Reviewed

Takayuki Kotani, Motohide Tamura, Hiroshi Suto, Jun Nishikawa, Bun'ei Sato, Wak Aoki, Tomonori Usuda, Takashi Kurokawa, Ken Kashiwagi, Shogo Nishiyama, Yuji Ikeda, Donald B. Hall, Klaus W. Hodapp, Shane Jacobson, Jun Hashimoto, Jun-Ichi Morino, Yasushi Okuyama, Yoichi Tanaka, Shota Suzuki, Sadahiro Inoue, Jungmi Kwon, Takuya Suenaga, Dehyun Oh, Haruka Baba, Norio Narita, Eiichiro Kokubo, Yutaka Hayano, Hideyuki Izumiura, Eiji Kambe, Tomoyuki Kudo, Nobuhiko Kusakabe, Masahiro Ikoma, Yasunori Hori, Masashi Omiya, Hidenori Genda, Akihiko Fukui, Yuka Fujii, Olivier Guyon, Hiroki Harakawa, Masahiko Hayashi, Masahide Hidai, Teruyuki Hirano, Masayuki Kuzuhara, Masahiro Machida, Taro Matsuo, Tetsuya Nagata, Hirohi Onuki, Masahiro Ogihara, Hideki Takami, Naruhisa Takato, Yasuhiro H. Takahashi, Chihiro Tachinami, Hiroshi Terada, Hajime Kawahara, Tomoyasu Yamamuro

GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V 9147 2014

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Language：English Publishing type：Research paper (international conference proceedings)

DOI： 10.1117/12.2055075

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The Transiting Exoplanet Survey Satellite

George R. Ricker, Joshua N. Winn, Roland Vanderspek, David W. Latham, Gaspar A. Bakos, Jacob L. Bean, Zachory K. Berta-Thompson, Timothy M. Brown, Lars Buchhave, Nathaniel R. Butler, R. Paul Butler, William J. Chaplin, David Charbonneau, Jorgen Christensen-Dalsgaard, Mark Clampin, Drake Deming, John Doty, Nathan De Lee, Courtney Dressing, E. W. Dunham, Michael Endl, Francois Fressin, Jian Ge, Thomas Henning, Matthew J. Holman, Andrew W. Howard, Shigeru Ida, Jon Jenkins, Garrett Jernigan, John Asher Johnson, Lisa Kaltenegger, Nobuyuki Kawai, Hans Kjeldsen, Gregory Laughlin, Alan M. Levine, Douglas Lin, Jack J. Lissauer, Phillip MacQueen, Geoffrey Marcy, P. R. McCullough, Timothy D. Morton, Norio Narita, Martin Paegert, Enric Palle, Francesco Pepe, Joshua Pepper, Andreas Quirrenbach, S. A. Rinehart, Dimitar Sasselov, Bun'ei Sato, Sara Seager, Alessandro Sozzetti, Keivan G. Stassun, Peter Sullivan, Andrew Szentgyorgyi, Guillermo Torres, Stephane Udry, Joel Villasenor

SPACE TELESCOPES AND INSTRUMENTATION 2014: OPTICAL, INFRARED, AND MILLIMETER WAVE 9143 2014

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DOI： 10.1117/12.2063489

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Planetary Companions to Three Evolved Intermediate-Mass Stars: HD 2952, HD 120084, and ω Serpentis Reviewed

SATO, Bun'ei

Publications of the Astronomical Society of Japan 65 ( 4 ) 85 2013.8

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Language：English Publishing type：Research paper (scientific journal) Publisher：Oxford University Press ({OUP})

DOI： 10.1093/pasj/65.4.85

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Disk Origin Narrow Metallic Absortion Lines Observed during the 2009-2011 Eclipse of epsilon Aurigae Reviewed

Kozo Sadakane, Eiji Kambe, Osamu Hashimoto, Satoshi Honda, Bun'ei Sato

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 65 ( 2 ) 2013.4

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DOI： 10.1093/pasj/65.2.L1

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A DOUBLE PLANETARY SYSTEM AROUND THE EVOLVED INTERMEDIATE-MASS STAR HD 4732 Reviewed

Bun'ei Sato, Masashi Omiya, Robert A. Wittenmyer, Hiroki Harakawa, Makiko Nagasawa, Hideyuki Izumiura, Eiji Kambe, Yoichi Takeda, Michitoshi Yoshida, Yoichi Itoh, Hiroyasu Ando, Eiichiro Kokubo, Shigeru Ida

ASTROPHYSICAL JOURNAL 762 ( 1 ) 2013.1

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DOI： 10.1088/0004-637X/762/1/9

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Substellar Companions to Seven Evolved Intermediate-Mass Stars Reviewed

Bun'ei Sato, Masashi Omiya, Hiroki Harakawa, Hideyuki Izumiura, Eiji Kambe, Yoichi Takeda, Michitoshi Yoshida, Yoichi Itoh, Hiroyasu Ando, Eiichiro Kokubo, Shigeru Ida

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 64 ( 6 ) 2012.12

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DOI： 10.1093/pasj/64.6.135

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A Common Proper Motion Stellar Companion to HAT-P-7 Reviewed

Norio Narita, Yasuhiro H. Takahashi, Masayuki Kuzuhara, Teruyuki Hirano, Takuya Suenaga, Ryo Kandori, Tomoyuki Kuo, Bun'ei Sato, Ryuji Suzuki, Shigeru Ida, Makiko Nagasawa, Lyu Abe, Wolfgang Brandner, Timothy D. Brandt, Joseph Carson, Sebastian E. Egner, Markus Feldt, Miwa Goto, Carol A. Grady, Olivier Guyon, Jun Hashimoto, Yutaka Hayano, Masahiko Hayashi, Saeko S. Hayashi, Thomas Henning, Klaus W. Hodapp, Miki Ishii, Masanori Iye, Markus Janson, Gillian R. Knapp, Nobuhiko Kusakabe, Jungmi Kwon, Taro Matsu, Satoshi Mayama, Michael W. McElwain, Shoken M. Miyama, Jun-Ichi Morino, Amaya Moro-Martin, Tetsuo Nishimura, Tae-Soo Pyo, Eugene Serabyn, Hiroshi Suto, Michihiro Takami, Naruhisa Takato, Hiroshi Terada, Christian Thalmann, Daigo Tomono, Edwin L. Turner, Makoto Watanabe, John P. Wisniewski, Toru Yamada, Hideki Takami, Tomonori Usuda, Motohide Tamura

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 64 ( 6 ) 2012.12

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DOI： 10.1093/pasj/64.6.L7

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PLANET-PLANET ECLIPSE AND THE ROSSITER-McLAUGHLIN EFFECT OF A MULTIPLE TRANSITING SYSTEM: JOINT ANALYSIS OF THE SUBARU SPECTROSCOPY AND THE KEPLER PHOTOMETRY Reviewed

Teruyuki Hirano, Norio Narita, Bun'ei Sato, Yasuhiro H. Takahashi, Kento Masuda, Yoichi Takeda, Wako Aoki, Motohide Tamura, Yasushi Suto

ASTROPHYSICAL JOURNAL LETTERS 759 ( 2 ) 2012.11

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DOI： 10.1088/2041-8205/759/2/L36

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A Planetary Companion to the Intermediate-Mass Giant HD 100655 Reviewed

Masashi Omiya, Inwoo Han, Hideyuki Izumiura, Byeong-Cheol Lee, Bun'ei Sato, Kang-Min Kim, Tae Seog Yoon, Eiji Kambe, Michitoshi Yoshida, Seiji Masuda, Eri Toyota, Seitaro Urakawa, Masahide Takada-Hidai

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 64 ( 2 ) 34 2012.4

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DOI： 10.1093/pasj/64.2.34

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A possible substellar companion to the intermediate-mass giant HD 175679 Reviewed

Liang Wang, Bun'ei Sato, Gang Zhao, Yu-Juan Liu, Kunio Noguchi, Hiroyasu Ando, Hideyuki Izumiura, Eiji Kambe, Masashi Omiya, Hiroki Harakawa, Fan Liu, Xiao-Shu Wu, Yoichi Takeda, Michitoshi Yoshida, Eiichiro Kokubo

RESEARCH IN ASTRONOMY AND ASTROPHYSICS 12 ( 1 ) 84 - 92 2012.1

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Infrared Doppler Instrument for the Subaru Telescope (IRD) Reviewed

M. Tamura, H. Suto, J. Nishikawa, T. Kotani, B. Sato, W. Aoki, T. Usuda, T. Kurokawa, K. Kashiwagi, S. Nishiyama, Y. Ikeda, D. Hall, K. Hodapp, J. Hashimoto, J. Morino, S. Inoue, Y. Mizuno, Y. Washizaki, Y. Tanaka, S. Suzuki, J. Kwon, T. Suenaga, D. Oh, N. Narita, E. Kokubo, Y. Hayano, H. Izumiura, E. Kambe, T. Kudo, N. Kusakabe, M. Ikoma, Y. Hori, M. Omiya, H. Genda, A. Fukui, Y. Fujii, O. Guyon, H. Harakawa, M. Hayashi, M. Hidai, T. Hirano, M. Kuzuhara, M. Machida, T. Matsuo, T. Nagata, Y. Ohnuki, M. Ogihara, S. Oshino, R. Suzuki, H. Takami, N. Takato, Y. Takahashi, C. Tachinami, H. Terada

GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY IV 8446 2012

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DOI： 10.1117/12.925885

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Further Observations of the Tilted Planet XO-3: A New Determination of Spin Orbit Misalignment, and Limits on Differential Rotation Reviewed

Teruyuki Hirano, Norio Narita, Bun'ei Sato, Joshua N. Winn, Wako Aoki, Motohide Tamura, Atsushi Taruya, Yasushi Suto

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 63 ( 6 ) L57 - L61 2011.12

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DOI： 10.1093/pasj/63.6.L57

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Stellar Parameters and Chemical Abundances of G Giants Reviewed

Liang Wang, Yujuan Liu, Gang Zhao, Bun'ei Sato

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 63 ( 5 ) 1035 - 1046 2011.10

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DOI： 10.1093/pasj/63.5.1035

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A Possible Tilted Orbit of the Super-Neptune HAT-P-11b

Teruyuki Hirano, Norio Narita, Avi Shporer, Bun'ei Sato, Wako Aoki, Motohide Tamura

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 63 S531 - S536 2011.3

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DOI： 10.1093/pasj/63.sp2.S531

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Korean-Japanese Planet Search Program: Substellar Companions around Intermediate-Mass Giants Reviewed

Masashi Omiya, Inwoo Han, Hideyuki Izumiura, Byeong-Cheol Lee, Bun'ei Sato, Kang-Min Kim, Tae Seog Yoon, Eiji Kambe, Michitoshi Yoshida, Seiji Masuda, Eri Toyota, Seitaro Urakawa, Masahide Takada-Hidai

PLANETARY SYSTEMS BEYOND THE MAIN SEQUENCE 1331 122 - + 2011

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DOI： 10.1063/1.3556192

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Orbital Evolution of Planets around Intermediate-Mass Giants Reviewed

Masanobu Kunitomo, Masahiro Ikoma, Bun'ei Sato, Yutaka Katsuta, Shigeru Ida

PLANETARY SYSTEMS BEYOND THE MAIN SEQUENCE 1331 314 - + 2011

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DOI： 10.1063/1.3556218

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An Abundance Analysis of the Primary Star of the Peculiar Eclipsing Binary epsilon Aurigae out of the Eclipsing Phase Reviewed

Kozo Sadakane, Eiji Kambe, Bun'ei Sato, Satoshi Honda, Osamu Hashimoto

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 62 ( 6 ) 1381 - 1390 2010.12

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DOI： 10.1093/pasj/62.6.1381

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Substellar Companions to Evolved Intermediate-Mass Stars: HD 145457 and HD 180314 Reviewed

Bun'ei Sato, Masashi Omiya, Yujuan Liu, Hiroki Harakawa, Hideyuki Izumiura, Eiji Kambe, Eri Toyota, Daisuke Murata, Byeong-Cheol Lee, Seiji Masuda, Yoichi Takeda, Michitoshi Yoshida, Yoichi Itoh, Hiroyasu Ando, Eiichiro Kokubo, Shigeru Ida, Gang Zhao, Inwoo Han

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 62 ( 4 ) 1063 - 1069 2010.8

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DOI： 10.1093/pasj/62.4.1063

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Search for Outer Massive Bodies around Transiting Planetary Systems: Candidates of Faint Stellar Companions around HAT-P-7 Reviewed

Norio Narita, Tomoyuki Kudo, Carolina Bergfors, Makiko Nagasawa, Christian Thalmann, Bunei Sato, Ryuji Suzuki, Ryo Kandori, Markus Janson, Miwa Goto, Wolfgang Brandner, Shigeru Ida, Lyu Abe, Joseph Carson, Sebastian E. Egner, Markus Feldt, Taras Golota, Olivier Guyon, Jun Hashimoto, Yutaka Hayano, Masahiko Hayashi, Saeko S. Hayashi, Thomas Henning, Klaus W. Hodapp, Miki Ishii, Gillian R. Knapp, Nobuhiko Kusakabe, Masayuki Kuzuhara, Taro Matsuo, Michael W. McElwain, Shoken M. Miyama, Jun-Ichi Morino, Amaya Moro-Martin, Tetsuo Nshimura, Tae-Soo Pyo, Eugene Serabyn, Takuya Suenaga, Hiroshi Suto, Yasuhiro Haruhi Takahashi, Michihiro Takami, Naruhisa Takato, Hiroshi Terada, Daigo Tomono, Edwin L. Turner, Makoto Watanabe, Toru Yamada, Hideki Takami, Tomonori Usuda, Motohide Tamura

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 62 ( 3 ) 779 - 786 2010.6

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DOI： 10.1093/pasj/62.3.779

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Improved Measurement of the Rossiter-McLaughlin Effect in the Exoplanetary System HD 17156

Norio Narita, Teruyuki Hirano, Bun'ei Sato, Joshua N. Winn, Yasushi Suto, Edwin L. Turner, Wako Aoki, Motohide Tamura, Toru Yamada

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 61 ( 5 ) 991 - 997 2009.10

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DOI： 10.1093/pasj/61.5.991

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THE NEW DETECTIONS OF Li-7/Li-6 ISOTOPIC RATIO IN THE INTERSTELLAR MEDIA Reviewed

S. Kawanomoto, T. Kajino, W. Aoki, M. Bessell, T. K. Suzuki, H. Ando, K. Noguchi, S. Honda, H. Izumiura, E. Kambe, K. Okita, K. Sadakane, B. Sato, A. Tajitsu, M. Takada-Hidai, W. Tanaka, E. Watanabe, M. Yoshida

ASTROPHYSICAL JOURNAL 701 ( 2 ) 1506 - 1518 2009.8

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DOI： 10.1088/0004-637X/701/2/1506

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A Massive Substellar Companion to the Massive Giant HD 119445 Reviewed

Masashi Omiya, Hideyuki Izumiura, Inwoo Han, Byeong-Cheol Lee, Bun'ei Sato, Eiji Kambe, Kang-Min Kim, Tae Seog Yoon, Michitoshi Yoshida, Seiji Masuda, Eri Toyota, Seitaro Urakawa, Masahide Takada-Hidai

Publications of the Astronomical Society of Japan 61 ( 4 ) 825 2009.8

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DOI： 10.1093/pasj/61.4.825

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Radial Velocity Search for Extrasolar Planets in Visual Binary Systems Reviewed

Eri Toyota, Yoichi Itoh, Shinichiro Ishiguma, Seitaro Urakawa, Daisuke Murata, Yumiko Oasa, Hiroko Matsuyama, Hitoshi Funayama, Bun'ei Sato, Tadashi Mukai

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 61 ( 1 ) 19 - 28 2009.2

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DOI： 10.1093/pasj/61.1.19

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The Detection of a Large-mass Planet Around a K0 IV Subgiant With an Almost-circular Orbit Reviewed

Hiroki Harakawa, Bun'ei Sato, Debra A. Fischer, Shigeru Ida, Masashi Omiya, John A. Johnson, Geoffrey W. Marcy, Eri Toyota, Yasunori Hori, Howard Isaacson, Andrew W. Howard, Kathryn M. G. Peek

EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY 1158 245 - + 2009

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Selection of Nearby Star Targets for the Subaru Strategic Exploration of Exoplanets and Disks Reviewed

R. Kandori, M. Tamura, J. Morino, M. Ishii, R. Suzuki, J. Hashimoto, N. Kusakabe, N. Narita, B. Sato, T. Yamada, K. Enya, M. Goto, J. Carson, C. Thalmann, M. McElwain, A. Moro-Martin, J. Knapp, E. L. Turner

EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY 1158 251 - + 2009

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Planetary Companions to Evolved Intermediate-Mass Stars: 14 Andromedae, 81 Ceti, 6 Lyncis, and HD 167042 Reviewed

Bun'ei Sato, Eri Toyota, Masashi Omiya, Hideyuki Izumiura, Eiji Kambe, Seiji Masuda, Yoichi Takeda, Yoichi Itoh, Hiroyasu Ando, Michitoshi Yoshida, Eiichiro Kokubo, Shigeru Ida

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 60 ( 6 ) 1317 - 1326 2008.12

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DOI： 10.1093/pasj/60.6.1317

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Measurement of the spin-orbit angle of exoplanet HAT-P-1b

John Asher Johnson, Joshua N. Winn, Norio Narita, Keigo Enya, Peter K. G. Williams, Geoffrey W. Marcy, Bun'ei Sato, Yasuhiro Ohta, Atsushi Taruya, Yasushi Suto, Edwin L. Turner, Gaspar Bakos, R. Paul Butler, Steven S. Vogt, Wako Aoki, Motohide Tamura, Toru Yamada, Yuzuru Yoshii, Marton Hidas

ASTROPHYSICAL JOURNAL 686 ( 1 ) 649 - 657 2008.10

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DOI： 10.1086/591078

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Evidence for a companion to BM Gem, a silicate carbon star Reviewed

Izumiura, H, Noguchi, K, Aoki, W, Honda, S, Ando, H, Takada-Hidai, M, Kambe, E, Kawanomoto, S, Sadakane, K, Sato, B, Tajitsu, A, Tanaka, W, Okita, K, Watanabe, E, Yoshida, M

The Astrophysical Journal 682 499 2008.7

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Development of iodine cells for Subaru HDS and Okayama HIDES. III. An improvement on the radial-velocity measurement technique Reviewed

Eiji Kambe, Hiroyasu Ando, Bun'ei Sato, Hideyuki Izumiura, Takashi Sekii, Diane B. Paulson, Kenshi Yanagisawa, Seiji Masuda, Hiromoto Shibahashi, Artie P. Hatzes, Milena Martic, Jean-Claude Lebrun, David E. Mkrtichian, Laszlo L. Kiss, Hans Bruntt, Simon J. O'Toole, Timothy R. Bedding

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 60 ( 1 ) 45 - 53 2008.2

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DOI： 10.1093/pasj/60.1.45

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Planetary Companions around Three Intermediate-Mass G and K Giants: 18 Del, xi Aql, and HD 81688

Sato, B, Izumiura, H, Toyota, E, Kambe, E, Ikoma, M, Omiya, M, Masuda, S, Takeda, Y, Murata, D, Itoh, Y, Ando, H, Yoshida, M, Kokubo, E, Ida, S

Publications of the Astronomical Society of Japan 60 539 2008

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A Substellar Companion to the Intermediate-Mass Giant 11 Com

Liu, Y. J, Sato, B, Zhao, G, Noguchi, K, Wang, H, Kambe, E, Ando, H, Izumiura, H, Chen, Y. Q, Okada, N, Toyota, E, Omiya, M, Masuda, S, Takeda, Y, Murata, D, Itoh, Y, Yoshida, M, Kokubo, E, Ida, S

The Astrophysical Journal 672 553 2008

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A Korea-Japan planet search program: Current status and discovery of a brown dwarf candidate Reviewed

Masashi Omiya, Hideyuki Izumiura, Bun'Ei Sato, Michitoshi Yoshida, Eiji Kambe, Eri Toyota, Seitaro Urakawa, Seiji Masuda, Masahide Takada-Hidai, Inwoo Han, Kang-Min Kim, Byeong-Cheol Lee, Tae Seog Yoon

Proceedings of the International Astronomical Union 3 ( 249 ) 53 - 56 2007.10

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DOI： 10.1017/S1743921308016360

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Measurement of the Rossiter-McLaughlin effect in the transiting exoplanetary system TrES-1 Reviewed

Norio Narita, Keigo Enya, Bun'ei Sato, Yasuhiro Ohta, Joshua N. Winn, Yasushi Suto, Atsushi Taruya, Edwin L. Turner, Wako Aoki, Motohide Tamura, Toru Yamada, Yuzuru Yoshii

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 59 ( 4 ) 763 - 770 2007.8

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DOI： 10.1093/pasj/59.4.763

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HAT-P-1b: A large-radius, low-density exoplanet transiting one member of a stellar binary

G. A. . Bakos, R. W. Noyes, G. Kovacs, D. W. Latham, D. D. Sasselov, G. Torres, D. A. Fischer, R. P. Stefanik, B. Sato, J. A. Johnson, A. Pal, G. W. Marcy, R. P. Butler, G. A. Esquerdo, K. Z. Stanek, J. Lazar, I. Papp, P. Sari, B. Sipocz

ASTROPHYSICAL JOURNAL 656 ( 1 ) 552 - 559 2007.2

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DOI： 10.1086/509874

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A Planetary Companion to the Hyades Giant ε Tauri

Sato, B, Izumiura, H, Toyota, E, Kambe, E, Takeda, Y, Masuda, S, Omiya, M, Murata, D, Itoh, Y, Ando, H, Yoshida, M, Ikoma, M, Kokubo, E, Ida, S

The Astrophysical Journal 661 527 2007

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The N2K consortium. III. Short-period planets orbiting HD 149143 and HD 109749

DA Fischer, G Laughlin, GW Marcy, RP Butler, SS Vogt, JA Johnson, GW Henry, C McCarthy, M Ammons, S Robinson, J Strader, JA Valenti, PR McCullough, D Charbonneau, J Haislip, HA Knutson, DE Reichart, P McGee, B Monard, JT Wright, S Ida, B Sato, D Minniti

ASTROPHYSICAL JOURNAL 637 ( 2 ) 1094 - 1101 2006.2

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DOI： 10.1086/498557

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The N2K consortium. II. A transiting hot Saturn around HD 149026 with a large dense core

B Sato, DA Fischer, GW Henry, G Laughlin, RP Butler, GW Marcy, SS Vogt, P Bodenheimer, S Ida, E Toyota, A Wolf, JA Valenti, LJ Boyd, JA Johnson, JT Wright, M Ammons, S Robinson, J Strader, C McCarthy, KL Tah, D Minniti

ASTROPHYSICAL JOURNAL 633 ( 1 ) 465 - 473 2005.11

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DOI： 10.1086/449306

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Subaru HDS transmission spectroscopy of the transiting extrasolar planet HD 209458b

N Narita, Y Suto, JN Winn, EL Turner, W Aoki, CJ Leigh, B Sato, M Tamura, T Yamada

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 57 ( 3 ) 471 - 480 2005.6

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DOI： 10.1093/pasj/57.3.471

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High-dispersion spectra collection of nearby F-K stars at Okayama Astrophysical Observatory: A basis for spectroscopic abundance standards

Y Takeda, B Sato, E Kambe, S Masuda, H Izumiura, E Watanabe, M Ohkubo, K Yanagisawa, Y Yasaka, S Honda, S Kawanomoto, W Aoki, H Ando, K Sadakane, M Takada-Hidai, SM Miyama

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 57 ( 1 ) 13 - 25 2005.2

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DOI： 10.1093/pasj/57.1.13

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Stellar parameters and photospheric abundances of late-G giants: Properties of the targets of the Okayama Planet Search Program

Y Takeda, B Sato, E Kambe, H Izumiura, S Masuda, H Ando

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 57 ( 1 ) 109 - 125 2005.2

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DOI： 10.1093/pasj/57.1.109

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Spectroscopic study on the atmospheric parameters of nearby F-K dwarfs and subgiants

Y Takeda, M Ohkubo, B Sato, E Kambe, K Sadakane

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 57 ( 1 ) 27 - 43 2005.2

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DOI： 10.1093/pasj/57.1.27

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Radial-velocity variability of G-type giants: First three years of the Okayama Planet Search Program

B Sato, E Kambe, Y Takeda, H Izumiura, S Masuda, H Ando

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 57 ( 1 ) 97 - 107 2005.2

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DOI： 10.1093/pasj/57.1.97

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The N2K consortium. I. A hot Saturn planet orbiting HD 88133

DA Fischer, G Laughlin, P Butler, G Marcy, J Johnson, G Henry, J Valenti, S Vogt, M Ammons, S Robinson, G Spear, J Strader, P Driscoll, A Fuller, T Johnson, E Manrao, C McCarthy, M Munoz, KL Tah, J Wright, S Ida, B Sato, E Toyota, D Minniti

ASTROPHYSICAL JOURNAL 620 ( 1 ) 481 - 486 2005.2

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DOI： 10.1086/426810

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A Search for H alpha Absorption in the Exosphere of the Transiting Extrasolar Planet HD 209458b

JN Winn, Y Suto, EL Turner, N Narita, BL Frye, W Aoki, B Sato, T Yamada

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 56 ( 4 ) 655 - 662 2004.8

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DOI： 10.1093/pasj/56.4.655

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Spectroscopic studies of extremely metal-poor stars with the Subaru High Dispersion Spectrograph. I. Observational data

S Honda, W Aoki, H Ando, H Izumiura, T Kajino, E Kambe, S Kawanomoto, K Noguchi, K Okita, K Sadakane, B Sato, M Takada-Hidai, Y Takeda, E Watanabe, TC Beers, JE Norris, SG Ryan

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 152 ( 1 ) 113 - 128 2004.5

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DOI： 10.1086/383201

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A planetary companion to the G-type giant star HD 104985 Reviewed

B Sato, H Ando, E Kambe, Y Takeda, H Izumiura, S Masuda, E Watanabe, K Noguchi, S Wada, N Okada, H Koyano, H Maehara, Y Norimoto, T Okada, Y Shimizu, F Uraguchi, K Yanagisawa, M Yoshida

ASTROPHYSICAL JOURNAL 597 ( 2 ) L157 - L160 2003.11

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DOI： 10.1086/379967

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High Dispersion Spectrograph (HDS) for the Subaru Telescope

K Noguchi, W Aoki, S Kawanomoto, H Ando, S Honda, H Izumiura, E Kambe, K Okita, K Sadakane, B Sato, A Tajitsu, M Takada-Hidai, W Tanaka, E Watanabe, M Yoshida

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 54 ( 6 ) 855 - 864 2002.12

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DOI： 10.1093/pasj/54.6.855

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Abundance analyses of 12 parent stars of extrasolar planets observed with the SUBARU/HDS

K Sadakane, M Ohkubo, Y Takeda, B Sato, E Kambe, W Aoki

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 54 ( 6 ) 911 - 931 2002.12

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DOI： 10.1093/pasj/54.6.911

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Spectroscopic determination of stellar atmospheric parameters: Application to mid-F through early-K dwarfs and subgiants

Y Takeda, BE Sato, E Kambe, K Sadakane, M Ohkubo

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 54 ( 6 ) 1041 - 1056 2002.12

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DOI： 10.1093/pasj/54.6.1041

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Development of iodine cells for the Subaru HDS and the Okayama HIDES: I. Instrumentation and performance of the spectrographs

E Kambe, B Sato, Y Takeda, H Ando, K Noguchi, W Aoki, H Izumiura, S Wada, S Masuda, N Okada, Y Shimizu, E Watanabe, M Yoshida, S Honda, S Kawanomoto

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 54 ( 6 ) 865 - 871 2002.12

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DOI： 10.1093/pasj/54.6.865

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Development of iodine cells for the Subaru HDS and the Okayama HIDES: II. New software for precise radial velocity measurements

B Sato, E Kambe, Y Takeda, H Izumiura, H Ando

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 54 ( 6 ) 873 - 882 2002.12

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DOI： 10.1093/pasj/54.6.873

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Detection of zinc in the very metal-poor post-AGB star HR 4049

Y Takeda, M Parthasarathy, W Aoki, Y Ita, Y Nakada, H Izumiura, K Noguchi, M Takada-Hidai, B Sato, A Tajitsu, S Honda, S Kawanomoto, H Ando, H Karoji

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 54 ( 5 ) 765 - 773 2002.10

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DOI： 10.1093/pasj/54.5.765

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Chemical composition of carbon-rich, very metal-poor subgiant LP 625-44 observed with the Subaru/HDS

W Aoki, H Ando, S Honda, M Iye, H Izumiura, T Kajino, E Kambe, S Kawanomoto, K Noguchi, K Okita, K Sadakane, B Sato, Shelton, I, M Takada-Hidai, Y Takeda, E Watanabe, M Yoshida

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 54 ( 3 ) 427 - 449 2002.6

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DOI： 10.1093/pasj/54.3.427

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Iodine-cell spectroscopy at Okayama Astrophysical Observatory: First results

Y Takeda, B Sato, E Kambe, E Watanabe, H Miyazaki, S Wada, H Ando, S Masuda, H Izumiura, H Koyano, H Maehara, Y Norimoto, T Okada, Y Shimizu, F Uraguchi, K Yanagisawa, M Yoshida, N Okada, S Kawanomoto, SM Miyama

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 54 ( 1 ) 113 - 120 2002.2

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DOI： 10.1093/pasj/54.1.113

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An abundance study in the Hg-Mn star 46 Aquilae (HD 186122) with the SUBARU/HDS

K Sadakane, M Takada-Hidai, Y Takeda, H Ando, W Aoki, S Honda, H Izumiura, T Kajino, E Kambe, S Kawanomoto, K Noguchi, K Okita, B Sato, E Watanabe

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 53 ( 6 ) 1223 - 1230 2001.12

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DOI： 10.1093/pasj/53.6.1223

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Photospheric abundances of volatile and refractory elements in planet-harboring stars

Y Takeda, B Sato, E Kambe, W Aoki, S Honda, S Kawanomoto, S Masuda, H Izumiura, E Watanabe, H Koyano, H Maehara, Y Norimoto, T Okada, Y Shimizu, F Uraguchi, K Yanagisawa, M Yoshida, SM Miyama, H Ando

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 53 ( 6 ) 1211 - 1221 2001.12

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DOI： 10.1093/pasj/53.6.1211

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The spin temperature of NH3 in Comet C/1999S4 (LINEAR)

H Kawakita, J Watanabe, H Ando, W Aoki, T Fuse, S Honda, H Izumiura, T Kajino, E Kambe, S Kawanomoto, K Noguchi, K Okita, K Sadakane, B Sato, M Takada-Hidai, Y Takeda, T Usuda, E Watanabe, M Yoshida

SCIENCE 294 ( 5544 ) 1089 - 1091 2001.11

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DOI： 10.1126/science.1064339

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葛原昌幸, 福井暁彦, LIVINGSTON John, CABALLERO Jose A., DE LEON Jerome P., 平野照幸, 笠木結, MURGAS Felipe, 成田憲保, 大宮正士, ORELL-MIQUEL Jaume, PALLE Enric, CHANGEAT Quentin, ESPARZA-BORGES Emma, 原川紘季, HELLIER Coel, 堀安範, 幾田佳, 石川裕之, 小玉貴則, 小谷隆行, 工藤智幸, MORALES Juan C., 森万由子, NAGEL Evangelos, PARVIAINEN Hannu, PERDELWITZ Volker, REINERS Ansgar, RIBAS Ignasi, SANZ-FORCADA Jorge, 佐藤文衛, SCHWEITZER Andreas, TABERNERO Hugo M., 宝田拓也, 鵜山太智, 渡辺紀治, ZECHMEISTER Mathias

日本地球惑星科学連合大会予稿集(Web) 2024 2024

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岡山188cm望遠鏡とドップラー振動撮像装置JOVIALによる木星自由振動観測

花山秀和, 生駒大洋, 泉浦秀行, 佐藤文衛, 小玉貴則, 中山陽史, 川内紀代恵, 青山雄彦, 堀内貴史

日本天文学会年会講演予稿集 2024 2024

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太陽近傍M型星Gliese12を公転する大気分光に適した地球サイズ惑星の発見

葛原昌幸, 福井暁彦, LIVINGSTON John, 平野照幸, 大宮正士, 堀安範, 小谷隆行, 森万由子, 寳田拓也, 鵜山太智, DE LEON Jerome, 成田憲保, 幾田佳, 渡辺紀治, 笠木結, 原川紘季, 工藤智幸, 石川裕之, 佐藤文衛, 小玉貴則, CABALLERO J., SANZ-FORCADA J., MURGAS F., ORELL-MIQUEL J., PALLE E., ESPARZA-BORGES E., Parviainen H., CHANGEAT Q., HELLIER C., MORALES J., RIBAS I., Nagel E., REINERS A., ZECHMEISTER M., PERDELWITZ V., SCHWEITZER A., TABERNERO H.

日本天文学会年会講演予稿集 2024 2024

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視線速度法を用いたプレアデス星団内における短周期惑星の探索 II

宝田拓也, 佐藤文衛, 大宮正士, 堀安範, 藤井通子

日本天文学会年会講演予稿集 2024 2024

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せいめい望遠鏡に搭載する系外惑星探索専用高分散分光器GAOES-RV:初期性能評価

佐藤文衛, 橋本修, 大宮正士, 泉浦秀行, 田實晃人, 神戸栄治, 原川紘季, 松林和也, 本田敏志, 寶田拓也, 堀安範, 成田憲保, 國友正信

日本天文学会年会講演予稿集 2023 2023

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せいめい望遠鏡に搭載する系外惑星探索専用高分散分光器GAOES-RV

佐藤文衛, 橋本修, 大宮正士, 泉浦秀行, 田實晃人, 神戸栄治, 原川紘季, 松林和也, 本田敏志, 寶田拓也, 堀安範, 成田憲保, 國友正信

日本天文学会年会講演予稿集 2022 2022

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視線速度法を用いたプレアデス星団内における短周期惑星の探索

宝田拓也, 佐藤文衛, 大宮正士, 堀安範, 藤井通子

日本天文学会年会講演予稿集 2019 2019

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G型巨星における惑星系の日韓共同探査.VIII:中質量巨星HD100655を周回する惑星の発見

大宮正士, 泉浦秀行, 神戸栄治, 佐藤文衛, 吉田道利, 豊田英里, 浦川聖太郎, 増田盛治, 比田井昌英, HAN Inwoo, KIM Kang‐Min, LEE Byeong‐Cheol, YOON Tae Seog

日本天文学会年会講演予稿集 2012 183 2012.2

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G型巨星における惑星系の日韓共同探査.VII

大宮正士, 泉浦秀行, 神戸栄治, 佐藤文衛, 吉田道利, 豊田英里, 浦川聖太郎, 増田盛治, 比田井昌英, HAN Inwoo, KIM Kang‐Min, LEE Byeong‐Cheol, YOON Tae Seog

日本天文学会年会講演予稿集 2011 145 2011.2

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Spin-Orbit Alignment of the TrES-4 Transiting Planetary System and Possible Additional Radial-Velocity Variation

Norio Narita, Bunei Sato, Teruyuki Hirano, Joshua N. Winn, Wako Aoki, Motohide Tamura

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 62 ( 3 ) 653 - 660 2010.6

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DOI： 10.1093/pasj/62.3.653

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G型巨星における惑星系の日韓共同探査.VI

大宮正士, 泉浦秀行, 吉田道利, 神戸栄治, 佐藤文衛, 豊田英里, 浦川聖太郎, 増田盛治, 比田井昌英, HAN Inwoo, KIM Kang‐Min, LEE Byeong‐Cheol, YOON Tae Seog

日本天文学会年会講演予稿集 2010 151 2010.2

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First Evidence of a Retrograde Orbit of a Transiting Exoplanet HAT-P-7b

Norio Narita, Bun'ei Sato, Teruyuki Hirano, Motohide Tamura

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 61 ( 5 ) L35 - L40 2009.10

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DOI： 10.1093/pasj/61.5.L35

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G型巨星における惑星系の日韓共同探査.V

大宮正士, 泉浦秀行, 吉田道利, 神戸栄治, 佐藤文衛, 豊田英里, 浦川聖太郎, 増田盛治, 比田井昌秀, HAN Inwoo, KIM Kang‐Min, LEE Byeong‐Cheol, YOON Tae Seog

日本天文学会年会講演予稿集 2009 147 2009.2

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G型巨星における惑星系の日韓共同探査.IV

大宮正士, 泉浦秀行, 吉田道利, 神戸栄治, 佐藤文衛, 豊田英里, 浦川聖太郎, 増田盛治, 比田井昌英, HAN Inwoo, KIM Kang‐Min, LEE Byeong‐Cheol, YOON Tae Seog

日本天文学会年会講演予稿集 2008 135 2008.2

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木曽シュミット望遠鏡による系外惑星のトランジットサーベイ

石隈慎一郎, 浦川聖太郎, 豊田英里, 佐藤文衛, 山田亨, 伊藤洋一

日本惑星科学会秋季講演会予稿集 2007 98 - 98 2007

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Language：Japanese Publisher：THE JAPANESE SOCIETY FOR PLANETARY SCIENCES

A transit of an extrasolar planet is a phenomenon that it cut across in front of its parent star. The detections of the phenomenon tell about the planet, such as its mass and density. We have been searching for the extrasolar planet candidates by transit method with the Kiso-Schmidt telescope from 2005. Wide field accurate photometric monitoring is necessary for successful planets detection using the transit method. The Kiso-Schmidt telescope has enough prerequisite because it has a wide field view (50'x 50'). We got about 3,000 lightcurves so far and detected near 50 variable star candidates. We present details and results of this observation.

DOI： 10.14909/jsps.2007f.0.98.0

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G型巨星における惑星系の日韓共同探査.II

泉浦秀行, 吉田道利, 佐藤文衛, 増田盛治, 豊田英里, 浦川聖太郎, HAN Inwoo

日本天文学会年会講演予稿集 2006 127 2006.2

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Errata: Subaru HDS transmission spectroscopy of the transiting extrasolar planet HD 209458b (vol 57, pg 471, 2005)

N Narita, Y Suto, JN Winn, EL Turner, W Aoki, CJ Leigh, B Sato, M Tamura, T Yamada

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 57 ( 4 ) 705 - 705 2005.8

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DOI： 10.1093/pasj/57.4.705

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G型巨星における惑星系の日韓共同探査.I

泉浦秀行, 吉田道利, 増田盛治, 佐藤文衛, 豊田英里, 浦川聖太郎, HAN Inwoo

日本天文学会年会講演予稿集 2005 131 2005.2

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西はりま天文台60cm望遠鏡を用いたトランジット法による太陽系外惑星探査

木村真二, 藤田健太, 石隈慎一郎, 白岩真弥, 豊田英里, 浦川聖太郎, 佐藤文衛, 伊藤洋一, 時政典孝, 向井正

日本惑星科学会秋季講演会予稿集 2005 88 - 88 2005

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Since the first announcement of a planet orbiting another solar-type star in 1995,160 extra solar planets have been detected to date. Search methods for extra solar planets involve Doppler shift method and transit method. We aim to find out extra solar planets by these methods. A number of the stars with large radial velocity variations were detected, using Subaru telescope. We are observing these objects at Nishiharima Astronomical Observatory's 60cm telescope, to detect planetary transit. We will report the photometric precision enough to detect transit and analytical result of some objects.

DOI： 10.14909/jsps.2005f.0.88.0

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ドップラーシフト法による連星系の系外惑星探査

豊田英里, 松山浩子, 浦川聖太郎, 木村真二, 大朝由美子, 伊藤洋一, 佐藤文衛, 向井正

日本惑星科学会秋季講演会予稿集 2005 87 2005

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DOI： 10.14909/jsps.2005f.0.87.0

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ドップラーシフト法による連星系の系外惑星探査

豊田英里, 浦川聖太郎, 伊藤洋一, 向井正, 松山浩子, 佐藤文衛

日本惑星科学会秋季講演会予稿集 2004 44 - 43 2004

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Among 120 extrasolar planets discovered to date, only 20 planets exist in multiple star systems.Recent theoretical study predicts that a planet can be stable in a multiplestar system which has a large semimajor axis, but current searches for planetsin multiple star systems are less extensive than those around in single stars.We have started a search for extrasolar planets in binary systems by preciseDoppler shift measurements from 2003,using HIgh Dispersion Echelle Spectrograph(HIDES) at the Okayama Astrophysical Observatory.We here report the current status of the survey.

DOI： 10.14909/jsps.2004f.0.43.0

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Search for extrasolar planets around intermediate-mass stars: Precise radial velocity measurements of late-G giants Reviewed

B Sato, H Ando, E Kambe, Y Takeda, H Izumiura, S Masuda

SCIENTIFIC FRONTIERS IN RESEARCH ON EXTRASOLAR PLANETS 294 51 - 54 2003

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Awards

日本天文学会研究奨励賞

2006

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Research Projects

Gaiaと地上観測の連携による軌道解析が導く星・惑星研究の加速

Grant number：24K07108 2024.4 - 2027.3

日本学術振興会科学研究費助成事業基盤研究(C)

葛原昌幸, 佐藤文衛

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Grant amount：\4420000 （ Direct Cost: \3400000 、 Indirect Cost：\1020000 ）

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銀河系の異なる恒星種族における系外惑星探索：低金属量環境下での巨大惑星形成

Grant number：23K25924 2023.4 - 2027.3

日本学術振興会科学研究費助成事業基盤研究(B)

佐藤文衛

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Grant amount：\18590000 （ Direct Cost: \14300000 、 Indirect Cost：\4290000 ）

本研究では、銀河系の厚い円盤と薄い円盤の両方に存在する「低金属量の太陽質量巨星」を対象とし、岡山188cm望遠鏡とせいめい3.8m望遠鏡を使って3年間に渡る集中的な惑星探索を実施する。これにより、同恒星の周りの巨大惑星の存在頻度とその金属量依存性を高い信頼度で導出し、両円盤における巨大惑星頻度の相違の有無と低金属量環境下での巨大惑星形成過程を解明することを目的としている。そのために本研究では、(1)機械学習を用いた事前のサンプル選定、(2)岡山188cm望遠鏡とせいめい3.8m望遠鏡を用いた系外惑星探索、という2本の研究の柱を立てて研究を遂行する。令和５年度は、(1)サンプル選定と金属量推定、および(2)せいめい望遠鏡を用いた系外惑星探索を実施した。
(1)については、先行研究によって、測光星震学観測から質量がよく決定された厚い円盤の巨星があることが分かったため、この中からせいめい望遠鏡での観測に適した巨星を100個選定した。これらに対してせいめい望遠鏡と高分散分光器GAOES-RVを用いてスペクトルを取得し、金属量の測定を行った結果、先行研究と概ね良い一致を示すことが分かった。そのため、これらを惑星探索のサンプルとして採用することとした。
(2)については、188cm望遠鏡が使用不可の状態であったため、せいめい望遠鏡での観測を実施した。令和5年度は約40夜の観測時間を獲得し、(1)で定めたサンプルに対して惑星探索観測を進めた結果、１００日から200日程度の周期的な視線速度変動を示す天体を５個程度同定した。これらは惑星をもっている可能性があるため、今後重点的に観測を進めていく。

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Second earth search by high-precision line-of-sight velocity measurement using visible ultra-broadband laser comb

Grant number：21H04500 2021.4 - 2026.3

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

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Grant amount：\41600000 （ Direct Cost: \32000000 、 Indirect Cost：\9600000 ）

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Innovation of Infrared Observations of Young Planets and Habitable Planets

Grant number：18H05442 2018.6 - 2023.3

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

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Grant amount：\343200000 （ Direct Cost: \264000000 、 Indirect Cost：\79200000 ）

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Searching for short-period planets around intermediate-mass stars using Kyoto-Okayama 3.8m telescope and a new dedicated spectrograph

Grant number：18H03736 2018.4 - 2022.3

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Sato Bunei

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Grant amount：\44590000 （ Direct Cost: \34300000 、 Indirect Cost：\10290000 ）

This research tried to conduct a new exoplanet search targeting intermediate-mass giants avoiding uncertainties in mass estimation for central stars and small number of sample stars inherent in evolved intermediate-mass stars. First we developed a machine-learning-based method to estimate metallicity of giant stars using multi-band photometric data, which can be used to efficiently identify intermediate-mass giants. Next we developed and installed a new high-dispersion spectrograph to Kyoto-Okayama 3.8m telescope for a dedicated exoplanet search. Lastly, we discovered a new short-period giant-planet candidate orbiting around an intermediate-mass giant using Okayama 188cm telescope, which have been rarely discovered from previous surveys.

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Observation of Jovian surface oscillations with a Doppler imaging spectrograph: Toward an understanding of the interior and origin of Jupiter

Grant number：17H01153 2017.4 - 2021.3

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Ikoma Masahiro

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Grant amount：\44460000 （ Direct Cost: \34200000 、 Indirect Cost：\10260000 ）

Jupiter, the heaviest planet in the Solar System, is thought to have had a large influence on the formation of the entire Solar System (including the existence of humans). However, its formation remains a mystery. Clues to understanding the formation of Jupiter are hidden in the planetary interior. In this study, we have developed an instrument and observation system to investigate the interior of Jupiter by investigating waves propagating through the planet's interior, taking a cue from the seismic exploration of the planet's interior conducted on the Earth. In addition, we have improved the classical theory of Jupiter formation and constructed a new theory of Jupiter formation in line with the latest understanding of the interior structure of Jupiter.

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Detecting planets around early-type stars with high-resolution infrared spectroscopy

Grant number：16K13784 2016.4 - 2020.3

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

Sato Bunei

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Grant amount：\3510000 （ Direct Cost: \2700000 、 Indirect Cost：\810000 ）

We have developed a method to detect exoplanets around early-type stars, which are normally difficult to detect with conventional techniques. While there are almost no spectral lines in stellar spectra of early-type stars that are available for measurements of stellar radial velocities, this in turn would make it easier to detect planetary spectra that are embedded into observed spectra of planet-harboring stars. We performed numerical simulation to test validity of this method using mock data. We found that we can detect planetary signal around early-type stars in M-band of mid-infrared wavelength range if telluric lines can be clearly removed from observed spectra with high-resolution spectroscopic observations. This method will be useful to detect and characterize planets around early-type stars with extremely large telescopes in future.

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Direct imaging and spectroscopy of gas giants and detection of terrestrial planets

Grant number：23103002 2011.4 - 2016.3

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

HAYASHI Masahiko, SUTO Yasushi, SATO Bun'ei, ITO Yoichi, HONDA Mitsuhiko, MORINO Junichi

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Grant amount：\548080000 （ Direct Cost: \421600000 、 Indirect Cost：\126480000 ）

As part of the Grant-in-Aid program “Extrasolar Planets” for Scientific Research on Innovative Areas, we mainly pursued the following two subjects:
(1) Direct Imaging of Gas Giants with Subaru Telescope. We successfully imaged two new gas giants. The one around GJ504 has a mass of 4 MJupter and could be called as “Second Jupiter.”
(2) Development of Instruments for Direct Spectroscopy of Exoplanets. We developed CHARIS, an integral field spectrograph, and SCExAO, an extreme adaptive optics system, for Subaru Telescope in order to carry out direct spectroscopy of exoplanets and successfully obtained spectra from exoplanets by combining these new instruments.

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Automation of exoplanet search

Grant number：23244038 2011.4 - 2016.3

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

izumiura hideyuki, KAMBE Eiji, SATO Bun'ei, TAKEDA Youichi, ANDO Hiroyasu, YOSHIDA Michitoshi, YANAGISAWA Kenshi, KURODA Daisuke, UKITA Nobuharu, FUKUI Akihiko

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Grant amount：\47710000 （ Direct Cost: \36700000 、 Indirect Cost：\11010000 ）

Renovating the observing system for automation, we have performed a Doppler survey of about 600 G,K giant stars of intermediate mass of 1.5-5 solar masses in order to reveal the diversity of planetary systems in those stars, with a sensitivity that allows detecting Saturn-mass planets within 3 AU from the central stars. We find 16 planets, three of which are independent confirmation of previous results, and 2 brown dwarfs. Of the 16, one planet orbits the most massive star among planet hosting G,K giants, one does the most distant place, and one is the least massive, which further expands the diversity of planets in the intermediate-mass G, K giant stars. Furthermore, a double planet system that is possibly in mutually retrograde orbits is found. Our findings have advanced our comprehensive understanding of the formation of exoplanets.

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Detailed studies on extrasolar-planets orbiting intermediate-mass stars based on radial velocimetry and photometry

Grant number：23540263 2011 - 2013

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

SATO BUNEI, IZUMIURA Hideyuki, KAMBE Eiji, ANDO Hiroyasu, TAKEDA Yoichi, NOGUCHI Kunio, YOSHIDA Michitoshi, IKOMA Masahiro, IDA Shigeru

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Grant amount：\4940000 （ Direct Cost: \3800000 、 Indirect Cost：\1140000 ）

We conducted a planet-search program with a precise Doppler technique targeting intermediate-mass giants and dwarfs in order to uncover poplulations of less-massive and short-period planets around such stars. We succeeded in discovering new planets less massive than two Jupiter-mass around interemdiate-mass giants, which have rarely been found around them. Also, we identified a planet candidate around an early-type star in an open cluster. The discoveries offer new insight into origins of mass and orbital-period distribution of planets around intermediate-mass stars.

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Development of Exoplanet Researches with New IR Technologies

Grant number：22000005 2010.4 - 2015.3

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Specially Promoted Research

TAMURA Motohide, USUDA Tomonori, SATO Bun-ei, HAYANO Yutaka, GUYON Olivier, KUROKAWA Takashi, AOKI Wako, SUTO Hiroshi, NISHIKAWA Jun, KOKUBO Eiichiro, KASHIWAGI Ken, KOTANI Takayuki

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Grant amount：\515970000 （ Direct Cost: \396900000 、 Indirect Cost：\119070000 ）

Using a high contrast IR-imager, we have completed the Subaru Strategic Program, SEEDS and found or confirmed 4 planets and 3 brown dwarfs via direct imaging technique. We have also revealed fine-structurs within the 30 circumstellar disks, reported for the first time the gaps and arms of the solar-system scale. Furthermore, we have developed a precision IR spectrometer for exoplanet detection including wide-band laser frequency comb, echelle grating, ceramic optics, low-vibration cryostat, and others.

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Dependence of extrasolar planetary systems on host stars' metallicity

Grant number：20244013 2008 - 2011

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

IDA Shigeru, SATO Bun' ei, WATANABE Junichi, KAWAI Nobuyuki, GENDA Hidenori

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Grant amount：\46670000 （ Direct Cost: \35900000 、 Indirect Cost：\10770000 ）

More than 750 extrasolar planets have been discovered, as well as more than 2300 candidates by Kepler space telescope, which motivates statistical discussions of planets and planetary systems. Here we investigated dependence of planetary systems on metallicity of the host stars. N-body and fluid dynamical simulations for planet-planet scattering and collisions have been carried out. Combining these results, we also performed Monte Carlo simulations to find that in a metal-rich disk around a metal-rich star, multiple gas giants are formed and they undergo orbital stability to pump up orbital eccentricities. We also promoted radial velocity surveys and construct a transit follow-up network involving amateurs and students to study the problem both from theory and observation.

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Studies on exoplanets around intermediate-mass stars based on precise spectroscopic and photometric observations

Grant number：20740101 2008 - 2010

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

SATO Bunei

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Grant amount：\4420000 （ Direct Cost: \3400000 、 Indirect Cost：\1020000 ）

We carried out a Doppler planet search program targeting intermediate-mass G-type giant stars in order to uncover properties of planets around intermediate-mass stars. From the program we discovered some new planets and brown dwarfs around them, which give us insight into formation and evolution of planets. In addition, we investigated detectability of short-period planets around intermediate-mass A-type dwarfs based on photometric transit observations by using the 30cm telescope installed at Tokyo Institute of Technology. We showed that we can achieve a differential photometric precision of less than 0.2% for such stars.

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Extra-solar planet search by high-performance high-dispersion spectroscopy using an optical fiber fed system

Grant number：18340055 2006 - 2008

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

YOSHIDA Michitoshi, IZUMIURA Hideyuki, SHIMIZU Yasuhiro, OKITA Kiichi, TAKEDA Yoichi, SATOU Bunei, SHIMIZU Yasuhiro, OKITA Kiichi, TAKEDA Yoichi, SATOU Bunei

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Grant amount：\15230000 （ Direct Cost: \14000000 、 Indirect Cost：\1230000 ）

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視線速度観測による太陽系外惑星探索に基づく中質量星の惑星系形成の研究

Grant number：17740106 2005 - 2007

日本学術振興会科学研究費助成事業若手研究(B)

佐藤文衛

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Grant amount：\3600000 （ Direct Cost: \3600000 ）

本研究では、国内外の望遠鏡を用いて平成17〜19年の3年間で合計約1000個の中質量G型巨星についてドップラー偏移法による系外惑星探索を敢行し、中質量星における惑星形成に関する知見を得ることを目的としている。平成19年度もこれまでに引き続き岡山観測所、中国興隆観測所、韓国普賢山天文台、ハワイ観測所などで観測時間を獲得し、観測天体数は約800個にのぼった。
平成19年度の観測結果から新たに得られた主な成果は次の通りである。
中質量巨星を周回するものとしては世界で3例目となる「褐色矮星」を日中共同観測によって発見した。太陽型星では褐色矮星が伴星として存在する確率は非常に小さい(褐色矮星砂漠)ことが知られているが、今回の発見はこれが中質量星にも当てはまるかどうかを調べるための貴重なサンプルとなった。
中質量G型巨星の周りに新たに3つの惑星を発見した。現在までに中質量星の周りの惑星は約15個見つかっているが、このうちの半数弱が我々の発見によるものである。これらの惑星はいずれも中心星から約0.7天文単位以上離れた軌道を周回し、内側領域における惑星の欠損が明らかになった。我々は、中心星の進化に伴う外層膨張が引き起こす惑星との潮汐相互作用を理論的に計算し、内側領域における惑星が潮汐力によって中心星に落下した結果、欠損が生じた可能性があることを示した。

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Extra-solar planet search by radial velocity measurements of stars

Grant number：17340056 2005 - 2007

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

ANDO Hiroyasu, NOGUCHI Kunio, HIDAI Masahide, TAKEDA Yoichi, IZUMIURA Hideyuki, BUNEI Sato

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Grant amount：\13820000 （ Direct Cost: \13100000 、 Indirect Cost：\720000 ）

In this three-year project, we have completed the extra-solar planet search program, that is, we tried to pick up the planet candidates by radial velocity observation of 300 G-giants with Subaru telescope (HDS), and followed up the radial velocity variations of these candidates with HIDES high dispersion spectrograph at Okayama Astrophysical Observatory, NAOCCES at Xinglong station in China, and HOES at Hugen san in Korea. As a result, we discovered 5 exoplanets and 1 brown dwarf, whose results were published in refereed journals. In addition to this, we submitted a paper on the discovery of 4 exoplanets. It is quite rare even in the world that one group accomplished the discovery of about 10 exoplanets, and we are now in a good position to discuss on the planet formation in intermediate mass stars. In a preliminary analysis, orbital periods of these planets are shown to be longer than 100days, and there seems to be a lower limit in orbital period for stars of intermediate mass range, which is a different situation from the planets around dwarf stars like the Sun. If this is true, it gives a certain limit on planet formation scenario. Increase of these sample might lead to give a firm foundation on this scenario. It is also shown that metallicity in the planet hovering stars is higher than that in non-hovering stars, which is a confirmation of the previous works.
Scientists of Japan, China, and Korea had two workshops at Hakone in Japan in 2006 and at Lijiang in China in 2007, respectively. In these meeting, we presented the observational results and discussed on the observational plans, and developed the software concerning radial velocity reduction. In particular, we achieved a tremendous progress in improving accuracy of radial velocity measurement. Previous precision, 5m/s at Okayama and 9m/s at Hugen san are much improved into 2m/s and 4m/s, respectively. Our intensive discussion during these workshops could lead to the mutual understandings that it is important that instrumental profile (IP) of the spectrograph should not change over the relevant wavelength, and the sampling points for IP should be increased in a sense of over sampling, that is, use of CCD with a small pixel size. Accuracy at Xinglong in China was not improved into less than 10m/s, but we are confident about how to improve radial velocity accuracy in futur.
Based on these results, we are considering increase in number of exoplanets around G-giants and based on the reinforced statistical data we try to understand planet formation

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