Organization
School of Science Researcher
Title
Researcher
External link
TOMINAGA RYOSUKE
Research Interests
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流体力学的不安定性
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宇宙流体力学
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原始惑星系円盤
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惑星形成
Research Areas
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Natural Science / Space and planetary sciences
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Natural Science / Astronomy
Education
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Nagoya University Graduate School of Science Department of Particle Physics and Astrophysics
2018.4 - 2021.3
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Nagoya University Graduate School of Science Department of Particle Physics and Astrophysics
2016.4 - 2018.3
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Nagoya University School of Science Department of Physics
2012.4 - 2016.3
Research History
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Institute of Science Tokyo Department of Earth and Planetary Sciences, School of Science Researcher (JSPS Research Fellow PD)
2026.4
Notes：Position changed under the JSPS Support Program for Employment of Young Researchers to Improve the Research Environment
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Institute of Science Tokyo Department of Earth and Planetary Sciences, School of Science JSPS Research Fellow PD
2024.10 - 2026.3
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Tokyo Institute of Technology Department of Earth and Planetary Sciences, School of Science JSPS Research Fellow PD
2024.4 - 2024.9
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RIKEN Cluster for Pioneering Research Special Postdoctoral Researcher (SPDR Fellow)
2021.4 - 2024.3
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Nagoya University Graduate School of Science JSPS Research Fellow DC1
2018.4 - 2021.3
Professional Memberships
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国際天文学連合
2022.6
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日本地球惑星科学連合
2019.12
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理論天文学宇宙物理学懇談会
2019.11
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日本惑星科学会
2018.7
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日本天文学会
2016.3
Papers
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Infrared spectroscopy of micron-sized spherical glass particles: Extinction, absorption, and emission measurements of single and layered arrangements
A. Tamanai, R. Schreyer, H. Mutschke, G. Rouillé, R.T. Tominaga
Journal of Quantitative Spectroscopy and Radiative Transfer 2026.10
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A Hybrid Origin for the Multiple Ring-gap Structures in the Large Protoplanetary Disk V1094 Sco: A Low-mass Planet and Secular Gravitational Instability
Masayuki Yamaguchi, Masahiro N. Machida, Ryosuke T. Tominaga, Jinshi Sai, Takayuki Muto, Michihiro Takami, Hauyu Baobab Liu, Ayumu Shoshi, Takashi Tsukagoshi, Shu Ishibashi
The Astrophysical Journal 2026.8
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Bridging the gap: Consistent modeling of protoplanetary disk heating and gap formation by planet-induced spiral shocks
Satoshi Okuzumi, Takayuki Muto, Ryosuke T Tominaga, Shizu Shimizu
Publications of the Astronomical Society of Japan 2026.4
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Hydrodynamical simulations of the vertical shear instability with dynamic dust and cooling rates in protoplanetary disks
Y. Fukuhara, M. Flock, S. Okuzumi, R. T. Tominaga
Astronomy & Astrophysics 2025.9
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Dust Coagulation Assisted by Streaming Instability in Protoplanetary Disks
Ryosuke T. Tominaga, Hidekazu Tanaka
The Astrophysical Journal 2025.4
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Rapid Dust Growth during Hydrodynamic Clumping due to Streaming Instability
Ryosuke T. Tominaga, Hidekazu Tanaka
The Astrophysical Journal 2023.12
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On Secular Gravitational Instability in Vertically Stratified Disks
Ryosuke T. Tominaga, Shu-ichiro Inutsuka, Sanemichi Z. Takahashi
The Astrophysical Journal 2023.8
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Nonlinear Outcome of Coagulation Instability in Protoplanetary Disks. II. Dust-ring Formation Mediated by Backreaction and Fragmentation
Ryosuke T. Tominaga, Hidekazu Tanaka, Hiroshi Kobayashi, Shu-ichiro Inutsuka
The Astrophysical Journal 2022.12
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Nonlinear Outcome of Coagulation Instability in Protoplanetary Disks. I. First Numerical Study of Accelerated Dust Growth and Dust Concentration at Outer Radii
Ryosuke T. Tominaga, Hiroshi Kobayashi, Shu-ichiro Inutsuka
The Astrophysical Journal 2022.9
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Coagulation Instability in Protoplanetary Disks: A Novel Mechanism Connecting Collisional Growth and Hydrodynamical Clumping of Dust Particles
Ryosuke T. Tominaga, Shu-ichiro Inutsuka, Hiroshi Kobayashi
The Astrophysical Journal 2021.12
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Secular Gravitational Instability of Drifting Dust in Protoplanetary Disks: Formation of Dusty Rings without Significant Gas Substructures
Ryosuke T. Tominaga, Sanemichi Z. Takahashi, Shu-ichiro Inutsuka
The Astrophysical Journal 2020.9
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Revised Description of Dust Diffusion and a New Instability Creating Multiple Rings in Protoplanetary Disks
Ryosuke T. Tominaga, Sanemichi Z. Takahashi, Shu-ichiro Inutsuka
The Astrophysical Journal 2019.8
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Non-linear development of secular gravitational instability in protoplanetary disks
Ryosuke T Tominaga, Shu-ichiro Inutsuka, Sanemichi Z Takahashi
Publications of the Astronomical Society of Japan 70 ( 1 ) 2018.1
Books
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Dust-gas instabilities in protoplanetary disks : toward understanding planetesimal formation
Tominaga, Ryosuke
Springer 2022.4 （ ISBN:9789811917646 ）
Presentations
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Dust growth assisted by streaming instability in protoplanetary disks Invited
R. Tominaga, H. Tanaka, K. Wada
The Formation of Stars and Planets in the Evolving Galaxy
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Dust growth assisted by Streaming Instability
R. Tominaga, H. Tanaka, K. Wada
3rd PFITS+ Meeting on Hydrodynamics of Circumstellar Disks and Planet Formation
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Pebble evolution assisted by streaming instability in protoplanetary disks
R. Tominaga, H. Tanaka
Pebbles in Planet Formation
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Planetesimal formation via dust-driven instabilities: Bridging gaps between dust growth and gravitational collapse
R. Tominaga
Mini-Workshop on PPDs and Planets in Hot Summer Nagoya
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A New Instability Driven by Dust Coagulation in Protoplanetary Disks
R. Tominaga, H. Tanaka, H. Kobayashi, S. Inutsuka
Extreme Solar Systems V
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Dust growth toward planetesimals via coagulation instability and secular gravitational instability in protoplanetary disks
R. Tominaga, H. Tanaka, H. Kobayashi, S. Z. Takahashi, S. Inutsuka
Protostars and Planets VII
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Dust transport and outer planetesimal formation via dust-growth-driven instability in protoplanetary disks
R. T. Tominaga, H. Tanaka, H. Kobayashi, S. Inutsuka
Symposium on Next Generation Astrochemistry
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Numerical studies of a new instability driven by dust growth in protoplanetary disks
R. Tominaga, H. Tanaka, H. Kobayashi, S. Inutsuka
The 9th East Asian Numerical Astrophysics Meeting (EANAM9)
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Coagulation instability and planetesimal formation in protoplanetary disks
R. Tominaga, H. Tanaka, H. Kobayashi, S. Inutsuka
NCTS-ASIAA Workshop: Stars, Planets, and Formosa
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Toward Understanding Planetesimal Formation in Protoplanetary Disks I: A Bridge between Dust Growth and Ring-Forming Instabilities
R. Tominaga
Planet-forming Disks: From Surveys to Answers
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Revised description of dust diffusion and dust-gas instabilities in protoplanetary disks
R. Tominaga
Planetesimal formation meeting
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Secular gravitational instability in protoplanetary disks: a mechanism for creating dusty rings and planetesimals
R. Tominaga, S. Z. Takahashi, S. Inutsuka
ALMA Workshop 2019: Early Planet Formation in Embedded Disks
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Revised description of dust diffusion and secular instabilities creating multiple rings in protoplanetary disks
R. Tominaga, S. Z. Takahashi, S. Inutsuka
Planet Formation Workshop 2019
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Formation of axisymmetric substructures via secular instabilities triggered by dust-gas friction and turbulent viscosity in protoplanetary disks
R. Tominaga, S. Z. Takahashi, S. Inutsuka
In the Spirit of Lyot 2019
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Revised description of dust diffusion and a new instability to create multiple rings in protoplanetary disks
R. Tominaga, S. Z. Takahashi, S. Inutsuka
Great Barriers in Planet Formation
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Revised description of dust diffusion and a new secular instability in protoplanetary disks: a possible mechanism to create ring structures and planetesimals
R. Tominaga, S. Z. Takahashi, S. Inutsuka
From Stars to Planets II - Connecting our understandings of star and planet formation
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Revised modeling of turbulent diffusion of dust particles and new instabilities in protoplanetary disks
R. Tominaga, S. Z. Takahashi, S. Inutsuka
Japanese-German meeting on Exoplanets and Planet Formation 2018
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On the linear growth of secular instability in circumplanetary disks
R. Tominaga, S. Z. Takahashi, S. Inutsuka
Circumplanetary Disks and Satellite Formation
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On the Mechanism of Creating Multiple Rings in Protoplanetary Disks: Non-Linear Development of Secular Gravitational Instability
R. Tominaga, S. Inutsuka
2017 Asia-Pacific Regional IAU Meeting
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Non-Linear Development of Secular Gravitational Instability: Case for HL Tau
R. Tominaga, S. Inutsuka
Protoplanetary Disk Dynamics and Planet Formation
Awards
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Springer Theses Award
2021.5
Ryosuke Tominaga
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理論懇シンポジウム 若手発表賞
2020.12
冨永遼佑
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日本惑星科学会 最優秀発表賞
2018.10
冨永遼佑
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名古屋大学大学院 理学研究科顕彰
2016.3
冨永遼佑
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名古屋大学総長顕彰「学修への取り組み」部門
2016.3
冨永遼佑
Research Projects
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Exploration of early planet formation based on dust microphysics
Grant number：24KJ1041 2024.4 - 2027.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows
Grant amount：\4810000 （ Direct Cost: \3700000 、 Indirect Cost：\1110000 ）
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Theoretical modeling of planetesimal formation in protoplanetary disks based on combined effects of disk dynamics and dust coagulation
Grant number：21K20385 2021.8 - 2024.3
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Research Activity Start-up
Tominaga Ryosuke
Grant amount：\3120000 （ Direct Cost: \2400000 、 Indirect Cost：\720000 ）
The purpose of this research is to reveal planetesimal formation, which is a necessary step in the planet-forming process. Conducting numerical simulations and linear analyses, we explored potential feedback process between dust concentration and collisional growth in protoplanetary disks. We showed (1) that coagulation instability promotes dust concentration that accelerates coagulation, (2) that previously proposed instability can operate in the resulting dust-rich regions and cause planetesimal formation, and (3) that smaller-scale instability called streaming instability can also promote dust coagulation.
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原始惑星系円盤における多重リング構造と微惑星形成機構の統一的解明
Grant number：18J20360 2018.4 - 2021.3
日本学術振興会 科学研究費助成事業 特別研究員奨励費
冨永 遼佑
Grant amount：\2200000 （ Direct Cost: \2200000 ）
本研究は惑星形成の現場である原始惑星系円盤の不安定性に注目し，近年の高解像度観測が示唆するダストの多重リング構造と惑星形成過程に重要な微惑星の形成過程の統一的解明を目指すものである．
本年度の研究では，ダスト成長が駆動する原始惑星系円盤の新しい不安定性(Coagulation instability, CI)を発見した．ダスト成長も含む局所線形解析で調べた結果，CIはダストの面密度がガスの0.1%程度まで下がった環境であっても成長でき，リング状にダストを集積することがわかった．ガス乱流に伴う質量拡散などの安定化を考慮してもガススケールハイト程度の波長ではやはりCIが成長でき，Kepler周期の数十倍程度でダストを集積することがわかった．本研究ではCIの数値シミュレーションも行い，ダストが中心星へ落下する前にCIが成長し，ダスト面密度が桁で上昇し得ることを示した．
CIは前年度まで調べてきた「永年重力不安定性による微惑星形成機構」に重要な役割を果たす．というのも，従来の不安定性が発達するためには「数mmから数cm程度のダストの質量面密度がガスの数%程度以上」という条件が円盤内で満たされる必要がある．一方先行研究では，サイズ成長と中心星への落下の結果ダストが数mmまで成長した段階では面密度がガスの0.1％程度になってしまうことが指摘されていた．CIによるダスト集積はこの問題を解決する．これに基づき，初期のサイズ成長の後，CIによってダストをリング状に集積し（リング形成），その後の永年重力不安定性等によって微惑星形成に発展するという新しい微惑星形成シナリオを提唱した．CIの線形解析の論文はすでにThe Astrophysical Journalに投稿済みであり，現在査読中である．
Teaching Experience
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電磁気学（地惑）
2025.12 - 2026.1 Institution：東京科学大学
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物理学実験
2025.6 - 2025.7 Institution：工学院大学
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電磁気学（地惑）
2024.12 - 2025.1 Institution：東京科学大学
Academic Activities
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Pebbles in Planet Formation, SOC
Role(s)： Planning, management, etc.
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日本地球惑星科学連合2025年大会 惑星科学セッション 代表コンビーナ
Role(s)： Planning, management, etc.
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日本地球惑星科学連合2024年大会 惑星科学セッション 共同コンビーナ
Role(s)： Planning, management, etc.