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Exploring the origins of orbital diversity of exoplanets through archival data integration

Research Project

Project/Area Number 21K13980
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 17010:Space and planetary sciences-related
Research InstitutionOsaka University

Principal Investigator

Masuda Kento  大阪大学, 大学院理学研究科, 准教授 (20874168)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords恒星の自転・年齢 / 測光観測 / 太陽系外惑星 / 恒星の自転と年齢 / 高分散分光観測 / 恒星の自転進化 / 惑星形成 / 原始惑星系円盤 / 系外惑星
Outline of Research at the Start

太陽系外の惑星には、円形でない軌道や、恒星の自転に対し傾いた軌道をもつものが存在する。これらの惑星系と、ほぼ円形でよく揃った惑星軌道をもつ太陽系との差異がどのように生じたかは明らかになっていない。本研究では、地上・宇宙の様々な望遠鏡で取得されたデータを組み合わせることで、惑星の軌道形状の主星質量への依存性や、恒星の自転に対する原始惑星系円盤の傾きを調べることで、系外惑星軌道の多様性の起源に迫る。

Outline of Final Research Achievements

A new analytical method has been developed to derive the distribution of stellar rotation periods from that of projected rotational velocities (Masuda et al. 2022, MNRAS 510, 5623). This method is useful for measuring the rotation periods of stellar populations to which previous methods could not be applied. Additionally, a new methodology was established to formalize observational biases dependent on stellar age in detecting stellar rotation periods using photometric time-series data. It was clearly demonstrated for the first time that there is a significant bias in older stars compared to the Sun (Masuda 2022a, ApJ 933, 195; Masuda 2022b, ApJ 937, 94).

Academic Significance and Societal Importance of the Research Achievements

本研究では、恒星の自転周期の新たな決定手法を開発し、また既存の決定手法の限界を明らかにした。恒星の自転周期の決定は、恒星の自転方向とそのまわりの惑星の公転方向の決定において重要な役割を果たす。太陽系では両者は揃っているが、太陽系外惑星では一般にずれていることがわかっており、この違いは惑星系の形成・進化の経路の多様性を反映するものと考えられている。したがって本研究の成果は、宇宙における太陽系や地球の普遍性・特殊性を解明する礎となる。

Report

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

    (8 results)

All 2023 2022 Other

All Int'l Joint Research (2 results) Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (3 results) (of which Invited: 1 results)

  • [Int'l Joint Research] University of California, Los Angeles(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] ESTEC(オランダ)

    • Related Report
      2021 Research-status Report
  • [Journal Article] On the Evolution of Rotational Modulation Amplitude in Solar-mass Main-sequence Stars2022

    • Author(s)
      Kento Masuda
    • Journal Title

      The Astrophysical Journal

      Volume: 933 Issue: 2 Pages: 195-195

    • DOI

      10.3847/1538-4357/ac7527

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Detectability of Rotational Modulation in Kepler Sun-like Stars as a Function of Age2022

    • Author(s)
      Kento Masuda
    • Journal Title

      The Astrophysical Journal

      Volume: 937 Issue: 2 Pages: 94-94

    • DOI

      10.3847/1538-4357/ac8d58

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Inferring the rotation period distribution of stars from their projected rotation velocities and radii: Application to late-F/early-G Kepler stars2022

    • Author(s)
      Kento Masuda, Erik A. Petigura, Oliver J. Hall
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 510 Issue: 4 Pages: 5623-5638

    • DOI

      10.1093/mnras/stab3650

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 太陽型星の自転・活動性進化の調査: 系外惑星系の時間進化の解明に向けて2023

    • Author(s)
      増田賢人
    • Organizer
      日本天文学会2023年秋季年会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 太陽型星の自転に伴う光度変動の振幅と自転周期・年齢の関係2022

    • Author(s)
      増田賢人
    • Organizer
      日本天文学会2022年秋季年会
    • Related Report
      2022 Research-status Report
  • [Presentation] 射影自転速度と半径を用いた恒星の自転周期分布の推定: 磁気制動則への示唆2022

    • Author(s)
      増田賢人
    • Organizer
      日本天文学会2022年春季年会
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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