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Explorations of climate diversity of terrestrial exo-planets and estimations of parameters based on climate states

Research Project

Project/Area Number 19H01947
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 17010:Space and planetary sciences-related
Research InstitutionHokkaido University

Principal Investigator

Ishiwatari Masaki  北海道大学, 理学研究院, 教授 (90271692)

Co-Investigator(Kenkyū-buntansha) 高橋 芳幸  神戸大学, 理学研究科, 准教授 (00372657)
中島 健介  九州大学, 理学研究院, 助教 (10192668)
小倉 知夫  国立研究開発法人国立環境研究所, 地球システム領域, 室長 (10370264)
はしもと じょーじ  岡山大学, 自然科学学域, 教授 (10372658)
竹広 真一  京都大学, 数理解析研究所, 准教授 (30274426)
須藤 靖  東京大学, 大学院理学系研究科(理学部), 教授 (90183053)
Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥13,130,000 (Direct Cost: ¥10,100,000、Indirect Cost: ¥3,030,000)
Fiscal Year 2022: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2020: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2019: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Keywords地球型系外惑星 / 大気大循環モデル / 気候レジーム図 / 惑星表層環境推定 / 模擬観測 / 惑星自転角速度・自転傾斜角推定
Outline of Research at the Start

多様な地球型系外惑星を想定した気候シミュレーションの結果を用いて, 将来のスペース望遠鏡でそれらの系外惑星を観測した場合にどのようなデータが得られるのかを推定する. これにより, 将来の天文観測において系外惑星の海陸分布・自転角速度・自転傾斜角を推定する方法について検討をおこなう. 本研究は, 惑星科学分野の気候シミュレーション技術と天文学分野における系外惑星観測技術を融合させ, 系外惑星研究の新たなブレイクスルーをもたらすことをめざすものである.

Outline of Final Research Achievements

In order to investigate a method for estimating planetary parameters such as obliquity from photometric data of exoplanet observations, we have performed a parameter experiment with an atmospheric general circulation model using a various settings for exoplanets. With a moc observation of calculated results, it is shown that the obliquity of the Earth can be estimated when the Earth would be observed using a space telescope. The results were published as Nakagawa et al. (2020). Climate regime diagrams for planets with a gray atmospheres were also produced. Some of the results were published as Ishiwatari et al. (2021), and the theoretical basis for the consideration of climate diversity was established.

Academic Significance and Societal Importance of the Research Achievements

本研究では, 大気大循環モデルで得られた数値実験結果を用いて, 地球型系外惑星の観測から自転傾斜角等の惑星パラメータを推定する方法の検討, 及びそのための基礎データとなる灰色大気を持つ惑星の気候多様性を記述する気候レジーム図の作成を行った. その結果, 地球と同じ海陸分布を持つ系外惑星が存在したすればその自転傾斜角は宇宙望遠鏡の観測により推定可能であること, 現在地球の太陽定数の値では惑星気候は全球凍結状態・部分凍結状態・暴走温室状態の多重性を持つことがわかった. これらの成果は, 地球型系外惑星の気候の多様性とパラメータ推定可能性の検討を進める上で欠くことのできない基盤となるものである.

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (12 results)

All 2022 2021 2020 2019 Other

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (6 results) Book (1 results) Remarks (1 results) Funded Workshop (1 results)

  • [Journal Article] Revision of “Dependence of Climate States of Gray Atmosphere on Solar Constant: From the Runaway Greenhouse to the Snowball States” by Ishiwatari et?al. (2007)2021

    • Author(s)
      Ishiwatari M.、Nakajima K.、Takehiro S.、Hayashi Y.‐Y.、Kawai Y.、Takahashi Y. O.
    • Journal Title

      Journal of Geophysical Research: Atmospheres

      Volume: 126 Issue: 11

    • DOI

      10.1029/2019jd031761

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Obliquity of an Earth-like Planet from Frequency Modulation of Its Direct-imaged Lightcurve: Mock Analysis from General Circulation Model Simulation2020

    • Author(s)
      Nakagawa Yuta、Kodama Takanori、Ishiwatari Masaki、Kawahara Hajime、Suto Yasushi、Takahashi Yoshiyuki O.、Hashimoto George L.、Kuramoto Kiyoshi、Nakajima Kensuke、Takehiro Shin-ichi、Hayashi Yoshi-Yuki
    • Journal Title

      The Astrophysical Journal

      Volume: 898 Issue: 2 Pages: 95-95

    • DOI

      10.3847/1538-4357/ab9eb8

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] H2O2 induced greenhouse warming on oxidized early Mars2020

    • Author(s)
      Ito, Y., G. L. Hashimoto, Y. O. Takahashi, M. Ishiwatari, K. Kuramoto
    • Journal Title

      Astrophysical Journal

      Volume: 893

    • NAID

      120007029080

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 陸惑星大気大循環モデルを用いた太陽定数増大実験2022

    • Author(s)
      石渡 正樹 、中島 健介、高橋 芳幸、林 祥介 、水野 陽太
    • Organizer
      JpGU2022
    • Related Report
      2022 Annual Research Report
  • [Presentation] 大気吸収係数が海惑星の気候レジーム図に与える影響2021

    • Author(s)
      河合 佑太 ( 理研・計算科学 ), 高橋 芳幸 ( 神大・理 /CPS), 石渡 正樹 ( 北大・理 ), 中島 健介 ( 九大・理 ), 竹広 真一 ( 京大・数理研 ), 樫村博基 ( 神大・理 /CPS), 富田 浩文 ( 理研・計算科学 ), 林 祥介 ( 神大・理 /CPS)
    • Organizer
      気象学会2021年秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 系外惑星大気を想定した理想的設定を用いた大気大循環モデル実験: いろんなことを射出限界が決める2021

    • Author(s)
      石渡正樹,地球流体電脳倶楽部
    • Organizer
      CPS & ABC ワークショップ
    • Related Report
      2020 Annual Research Report
  • [Presentation] 陸惑星における完全蒸発状態の発生に関する大気大循環モデル実験2019

    • Author(s)
      吉田哲治, 石渡正樹
    • Organizer
      日本惑星 科学会秋季講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] umerical Experiments on Climate of Land Planets Using an Atmospheric General Circulation Model2019

    • Author(s)
      Ishiwatari, M. T. Yoshida, K. Nakajima,Y. O. Takahashi, S. Takehiro, Y.-Y. Hayashi
    • Organizer
      Planet2/RESCEU Symposium 2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] Numerical Experiments on Climate of Terrestrial Exoplanets: Aquaplanet and Land Planets.2019

    • Author(s)
      Ishiwatari, M., T. Yoshida, K. Nakajima, Y. O. Takahashi, S. Takehiro, Y.-Y. Hayashi
    • Organizer
      The AGU Fall Meeting 2019
    • Related Report
      2019 Annual Research Report
  • [Book] Numerical studies on the variety of climates of exoplanets using idealistic configurations2021

    • Author(s)
      Masaki Ishiwatari, Kensuke Nakajima, Shin-ichi Takehiro, Yuta Kawai, Yoshiyuki O. Takahashi, George L. Hashimoto, Youhei Sasaki and Yoshi-Yuki Hayashi
    • Total Pages
      79
    • Publisher
      Center for Global Environmental Research, National Institute for Environmental Studies, Japan
    • Related Report
      2020 Annual Research Report
  • [Remarks] 地球流体電脳倶楽部

    • URL

      http://dennou-k.gfd-dennou.org/

    • Related Report
      2020 Annual Research Report
  • [Funded Workshop] ABC Project/CPS Workshop on Climates of Terrestrial Planets in Various Solar Systems2020

    • Related Report
      2019 Annual Research Report

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Published: 2019-04-18   Modified: 2024-01-30  

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