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Investigation of planet formation process through the simulations of chemical and physical evolution of protoplanetary disks and observations of chemical composition of exoplanet atmospheres

Research Project

Project/Area Number 21K13984
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 17010:Space and planetary sciences-related
Research InstitutionKyoto University (2024)
Japan Aerospace EXploration Agency (2023)
Institute of Physical and Chemical Research (2021-2022)

Principal Investigator

KAWASHIMA Yui  京都大学, 理学研究科, 助教 (40897691)

Project Period (FY) 2021-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords系外惑星 / 褐色矮星 / 大気組成 / 惑星形成 / 原始惑星系円盤
Outline of Research at the Start

本研究では、系外惑星大気の元素存在度から惑星の形成過程、また形成時の原始惑星系円盤の環境を解明することを目指す。そのために、観測可能な大気の元素存在度が、円盤の乱流強度や惑星の形成場所、惑星移動の有無にどのように依存するのかを明らかにする。加えて、実際に系外惑星大気の観測を行い、構築したモデルを適用することにより、その惑星の形成過程と形成時の円盤環境を明らかにする。この理論・観測両面からの研究により、惑星形成論の大きな未解決問題である、「惑星が形成時に大規模な移動を経験するか」を解明する。

Outline of Final Research Achievements

In this study, I aimed to elucidate the formation processes of planetary-mass objects by observing their atmospheric spectra and estimating elemental abundances in their atmospheres. To achieve this, I observed the atmospheric spectra of brown dwarfs with host stars using the high-dispersion spectrograph IRD (InfraRed Doppler) mounted on the Subaru Telescope. The results of the analysis have been compiled into a paper, which is scheduled for publication in The Astrophysical Journal. Additionally, I applied my own atmospheric model to the spectra of four exoplanets observed by the James Webb Space Telescope (JWST) and the Hubble Space Telescope (HST), allowing us to estimate their atmospheric compositions and interpret their formation processes (one co-authored paper published, and three others under peer review).

Academic Significance and Societal Importance of the Research Achievements

太陽系外惑星や、惑星と恒星の中間質量天体である褐色矮星に対して、望遠鏡を用いた分光観測を行うと、その外殻を覆っている大気のスペクトルを取得することができる。大気のスペクトルには、その惑星の形成・進化過程や生命存在可能性を明らかにする手掛かりが含まれている。本研究では、複数の惑星・褐色矮星の大気観測を行い、取得したスペクトルの解析を行うことで、それらの形成過程の解釈を行った。この成果は惑星の多様性、すなわち我々の地球や太陽系の普遍性・特殊性を理解することにも繋がりうるものである。

Report

(5 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (52 results)

All 2025 2024 2023 2022 2021 Other

All Int'l Joint Research (13 results) Journal Article (11 results) (of which Int'l Joint Research: 9 results,  Peer Reviewed: 11 results,  Open Access: 8 results) Presentation (25 results) (of which Int'l Joint Research: 9 results,  Invited: 10 results) Remarks (3 results)

  • [Int'l Joint Research] University College London/University of Central Lancashire/University of Surrey(英国)

    • Related Report
      2024 Annual Research Report
  • [Int'l Joint Research] US Naval Observatory/NASA Goddard Space Flight Center/University of Maryland(米国)

    • Related Report
      2024 Annual Research Report
  • [Int'l Joint Research] The University of Western Australia/University of Sydney(オーストラリア)

    • Related Report
      2024 Annual Research Report
  • [Int'l Joint Research] Technische Universitat Dresden/Universitat Heidelberg/Max-Planck-Institut(ドイツ)

    • Related Report
      2024 Annual Research Report
  • [Int'l Joint Research] Tsung-Dao Lee Institute(中国)

    • Related Report
      2024 Annual Research Report
  • [Int'l Joint Research]

    • Related Report
      2024 Annual Research Report
  • [Int'l Joint Research] Max Planck Institute for Astronomy(ドイツ)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Harvard & Smithsonian/The University of Kansas/University of Texas at Austin(米国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Universite de Montreal(カナダ)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] University of Southern Queensland(オーストラリア)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] SRON(オランダ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of Kansas/Sandia National Laboratories(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Universite Paris-Saclay(フランス)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Probing Two-dimensional Asymmetries of an Exoplanet Atmosphere from Chromatic Transit Variation2025

    • Author(s)
      Tada Shotaro、Kawahara Hajime、Kawashima Yui、Kotani Takayuki、Masuda Kento
    • Journal Title

      The Astronomical Journal

      Volume: 169 Issue: 5 Pages: 255-255

    • DOI

      10.3847/1538-3881/adbe65

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Measurement of Methane Line Broadening in Hot Hydrogen/Helium Atmospheres at λ=1.60-1.63 μm for Substellar Object Spectroscopy2025

    • Author(s)
      Hosokawa Ko、Kotani Takayuki、Kawahara Hajime、Kawashima Yui、Masuda Kento、Takahashi Aoi、Yoshioka Kazuo
    • Journal Title

      The Astrophysical Journal

      Volume: 984 Issue: 1 Pages: 92-92

    • DOI

      10.3847/1538-4357/adc455

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Differentiable Modeling of Planet and Substellar Atmosphere: High-Resolution Emission, Transmission, and Reflection Spectroscopy with ExoJAX22025

    • Author(s)
      Hajime Kawahara, Yui Kawashima, Shotaro Tada, Hiroyuki Tako Ishikawa, Ko Hosokawa, Yui Kasagi, Takayuki Kotani, Kento Masuda, Stevanus Nuguroho, Motohide Tamura, Hibiki Yama, Daniel Kitzmann, Nicolas Minesi, Brett M. Morris
    • Journal Title

      The Astrophysical Journal

      Volume: -

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] JASMINE: Near-infrared astrometry and time-series photometry science2024

    • Author(s)
      Kawata Daisuke、Kawahara Hajime、Gouda Naoteru、et al.
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: psae020 Issue: 3 Pages: 1-40

    • DOI

      10.1093/pasj/psae020

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A Fourth Planet in the Kepler-51 System Revealed by Transit Timing Variations2024

    • Author(s)
      Masuda Kento、Libby-Roberts Jessica E.、Livingston John H.、Stevenson Kevin B.、Gao Peter、Vissapragada Shreyas、Fu Guangwei、Han Te、Greklek-McKeon Michael、Mahadevan Suvrath、Agol Eric、Bello-Arufe Aaron、Berta-Thompson Zachory、Canas Caleb I.、Chachan Yayaati、Hebb Leslie、Hu Renyu、Kawashima Yui et al.
    • Journal Title

      The Astronomical Journal

      Volume: 168 Issue: 6 Pages: 294-294

    • DOI

      10.3847/1538-3881/ad83d3

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A Spectroscopic Thermometer: Individual Vibrational Band Spectroscopy with the Example of OH in the Atmosphere of WASP-33b2023

    • Author(s)
      Ernst J. W.、Waldmann Ingo、Tennyson Jonathan、Kawahara Hajime、Kuzuhara Masayuki、Hirano Teruyuki、Kotani Takayuki、Kawashima Yui、Masuda Kento、Birkby Jayne L.、Watson Chris A.、Tamura Motohide、Zwintz Konstanze、Harakawa Hiroki、Kudo Tomoyuki、Hodapp Klaus、Jacobson Shane、Konishi Mihoko、Kurokawa Takashi et al.
    • Journal Title

      The Astronomical Journal

      Volume: 166 Issue: 2 Pages: 41-41

    • DOI

      10.3847/1538-3881/acdb75

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Tentative Evidence for Water Vapor in the Atmosphere of the Neptune-sized Exoplanet HD 106315c2022

    • Author(s)
      Kreidberg Laura、Molliere Paul、Crossfield Ian J. M.、Thorngren Daniel P.、Kawashima Yui、Morley Caroline V.、Benneke Bjorn、Mikal-Evans Thomas、Berardo David、Kosiarek Molly R.、Gorjian Varoujan、Ciardi David R.、Christiansen Jessie L.、Dragomir Diana、Dressing Courtney D.、Fortney Jonathan J. et al.
    • Journal Title

      The Astronomical Journal

      Volume: 164 Issue: 4 Pages: 124-124

    • DOI

      10.3847/1538-3881/ac85be

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] アストロケミストリー特集 (2) 系外惑星大気の化学2022

    • Author(s)
      川島 由依
    • Journal Title

      天文月報

      Volume: 115 Pages: 286-286

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Investigation of the upper atmosphere in ultra-hot Jupiter WASP-76?b with high-resolution spectroscopy2022

    • Author(s)
      Kawauchi Kiyoe、Narita Norio、Sato Bun’ei、Kawashima Yui
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 74 Issue: 2 Pages: 225-238

    • DOI

      10.1093/pasj/psab120

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Autodifferentiable Spectrum Model for High-dispersion Characterization of Exoplanets and Brown Dwarfs2022

    • Author(s)
      Kawahara Hajime、Kawashima Yui、Masuda Kento、Crossfield Ian J. M.、Pannier Erwan、van den Bekerom Dirk
    • Journal Title

      The Astrophysical Journal Supplement Series

      Volume: 258 Issue: 2 Pages: 31-31

    • DOI

      10.3847/1538-4365/ac3b4d

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Implementation of disequilibrium chemistry to spectral retrieval code ARCiS and application to 16 exoplanet transmission spectra2021

    • Author(s)
      Kawashima Yui、Min Michiel
    • Journal Title

      Astronomy & Astrophysics

      Volume: 656 Pages: A90-A90

    • DOI

      10.1051/0004-6361/202141548

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Exoplanet Science with TMT2025

    • Author(s)
      Y. Kawashima
    • Organizer
      Subaru Users Meeting FY 2024
    • Related Report
      2024 Annual Research Report
    • Invited
  • [Presentation] Characterizing the Atmospheres of Exoplanets and Brown Dwarfs2025

    • Author(s)
      川島由依
    • Organizer
      Cool Stars Workshop in Japan
    • Related Report
      2024 Annual Research Report
    • Invited
  • [Presentation] 可視・赤外分光観測で探る系外惑星の大気2025

    • Author(s)
      川島由依
    • Organizer
      第30回天体スペクトル研究会
    • Related Report
      2024 Annual Research Report
    • Invited
  • [Presentation] Detectability of the coolest Y-type brown dwarfs by a next-generation infrared satellite2024

    • Author(s)
      Y. Kawashima, S. Miyazaki, and H. Kawahara
    • Organizer
      Japan Geoscience Union Meeting 2024
    • Related Report
      2024 Annual Research Report
  • [Presentation] Exoplanet Science2024

    • Author(s)
      川島由依
    • Organizer
      TMT-ACCESS 2024
    • Related Report
      2024 Annual Research Report
    • Invited
  • [Presentation] ExoJAXを用いた褐色矮星大気の高分散スペクトル解析2024

    • Author(s)
      川島由依, 河原創, 笠木結, 石川裕之, 増田賢人, 小谷隆行, 工藤智幸, 平野照幸, 葛原昌幸, Stevanus Nugroho, John Livingston, 田村元秀, IRDチーム
    • Organizer
      天文学における自動微分と逆問題研究会
    • Related Report
      2024 Annual Research Report
  • [Presentation] Observability of CO worlds2024

    • Author(s)
      川島由依
    • Organizer
      2nd CO world Plenary Meeting
    • Related Report
      2024 Annual Research Report
  • [Presentation] 巨大惑星・褐色矮星の下層大気2024

    • Author(s)
      川島由依
    • Organizer
      系外惑星大気Workshop 2024
    • Related Report
      2024 Annual Research Report
  • [Presentation] Subaru/IRD high-resolution spectroscopy of a T-type brown dwarf and investigation of its atmospheric properties with high-resolution spectrum model ExoJAX2024

    • Author(s)
      Y. Kawashima, H. Kawahara, Y. Kasagi, H. Ishikawa, K. Masuda, T. Kotani, T. Kudo, T. Hirano, M. Kuzuhara, S. Nugroho, J. Livingston, M. Tamura, and IRD team,
    • Organizer
      Subaru Users Meeting FY2023
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] New Ariel Working Group fousing on clouds/haze2023

    • Author(s)
      Y. Kawashima, S. Ma, K. Ohno, Y. Ito, and cloud/haze working group
    • Organizer
      2023 fall Ariel Consortium Meeting
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Exoplanet Science in the Era of JWST2023

    • Author(s)
      Y. Kawashima
    • Organizer
      Japanese-American-German Frontiers of Science Symposium (JAGFOS) 2023
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] すばる望遠鏡IRDによるT型褐色矮星の高分散分光観測と高分散スペクトルモデルExoJAXによる大気特性の調査2023

    • Author(s)
      川島由依, 河原創, 笠木結, 石川裕之, 増田賢人, 小谷隆行, 工藤智幸, 平野照幸, 葛原昌幸, Stevanus Nugroho, John Livingston, 田村元秀, IRDチーム
    • Organizer
      日本天文学会 2023年秋季大会
    • Related Report
      2023 Research-status Report
  • [Presentation] Atmospheric characterization of giant planets and brown dwarfs2023

    • Author(s)
      川島由依
    • Organizer
      JASMINE Consortium Meeting 2023
    • Related Report
      2023 Research-status Report
    • Invited
  • [Presentation] Subaru/IRD high-resolution spectroscopy of a T-type brown dwarf and investigation of its atmospheric properties with high-resolution spectrum model ExoJAX2023

    • Author(s)
      Y. Kawashima, H. Kawahara, Y. Kasagi, H. Ishikawa, K. Masuda, T. Kotani, T. Kudo, T. Hirano, M. Kuzuhara, S. Nugroho, J. Livingston, M. Tamura, and IRD team
    • Organizer
      Exoclimes VI
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Subaru/IRD high-resolution spectroscopy of a T-type brown dwarf and investigation of its atmospheric properties with high-resolution spectrum model ExoJAX2023

    • Author(s)
      Y. Kawashima, H. Kawahara, Y. Kasagi, H. Ishikawa, K. Masuda, T. Kotani, T. Kudo, T. Hirano, M. Kuzuhara, S. Nugroho, J. Livingston, M. Tamura, and IRD team
    • Organizer
      Japan Geioscience Union Meeting 2023
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Subaru/IRD high-resolution spectroscopy of a T-type brown dwarf and investigation of its atmospheric properties with high-resolution spectrum model ExoJAX2023

    • Author(s)
      Y. Kawashima, H. Kawahara, Y. Kasagi, H. Ishikawa, K. Masuda, T. Kotani, T. Kudo, T. Hirano, M. Kuzuhara, S. Nugroho, J. Livingston, M. Tamura, and IRD team
    • Organizer
      Protostars and Planets VII
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Cloud models in planets2023

    • Author(s)
      Y. Kawashima
    • Organizer
      Cloud Zwei Con
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] GREX-PLUS:系外惑星のサイエンス2022

    • Author(s)
      川島由依, 藤井友香, 松尾太郎, 大野和正
    • Organizer
      光赤天連シンポジウム:2030年代にどのような戦略的中型計画を推進するのか
    • Related Report
      2022 Research-status Report
  • [Presentation] Implementation of Disequilibrium Chemistry to Spectral Retrieval Code ARCiS and Application to Sixteen Exoplanet Transmission Spectra: Indication of Disequilibrium Chemistry for HD 209458b and WASP-39b2022

    • Author(s)
      Y. Kawashima and M. Min
    • Organizer
      COSPAR 2022 44th Scientific Assembly
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] JASMINEによる褐色矮星の光度変動観測2022

    • Author(s)
      川島由依, 河原創, 小玉貴則, 増田賢人, 小谷隆行, 平野照幸, JASMINE系外惑星検討班 (Exo-JASMINEチーム)
    • Organizer
      日本天文学会2022年秋季年会
    • Related Report
      2022 Research-status Report
  • [Presentation] すばる望遠鏡IRDによる褐色矮星Gl 229Bの高分散分光観測とスペクトル計算コードExoJAXを用いた大気特性の調査2022

    • Author(s)
      川島由依, 河原創, 笠木結, 石川裕之, 増田賢人, 小谷隆行, 工藤智幸, 平野照幸, 葛原昌幸, Stevanus Nugroho, John Livingston, 田村元秀, IRDチーム
    • Organizer
      日本惑星科学会2022年秋季講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] Implementation of disequilibrium chemistry to spectral retrieval code ARCiS: Indication of disequilibrium chemistry for HD 209458b and WASP-39b2022

    • Author(s)
      Y. Kawashima and M. Min
    • Organizer
      Symposium on Next Generation Astrochemistry
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] GREX-PLUSによる系外惑星観測2022

    • Author(s)
      川島由依、藤井友香、松尾太郎
    • Organizer
      GREX-PLUSサイエンス検討会 FY2021
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 系外ガス惑星大気の化学とエアロゾル:太陽系惑星とのシナジー2022

    • Author(s)
      川島由依
    • Organizer
      第23回惑星圏研究会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] JASMINEによる褐色矮星の光度変動観測2021

    • Author(s)
      川島由依
    • Organizer
      JASMINE Consortium Meeting 2021
    • Related Report
      2021 Research-status Report
    • Invited
  • [Remarks] 個人ホームページ

    • URL

      https://sites.google.com/view/yuikawashima/home

    • Related Report
      2023 Research-status Report
  • [Remarks]

    • URL

      https://sites.google.com/view/yuikawashima/home

    • Related Report
      2022 Research-status Report
  • [Remarks]

    • URL

      https://sites.google.com/view/yuikawashima/home

    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2026-01-16  

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