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4.6 billion years of solar system migration explored by short-lived radionuclides and galaxy simulations

Research Project

Project/Area Number 22K20387
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0204:Astronomy, earth and planetary science, and related fields
Research InstitutionThe University of Aizu

Principal Investigator

Fujimoto Yusuke  会津大学, コンピュータ理工学部, 准教授 (90965691)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords銀河系 / 太陽系 / 数値シミュレーション / 銀河 / 星間物質 / シミュレーション
Outline of Research at the Start

銀河系内における多様な星・惑星系形成と、我々太陽系の起源を理解したい。そのためには、時間的にも(46億年間)、空間的にも(銀河円盤全体)、銀河スケールで星と星間ガスの物質循環を解明することが必須である。本研究は天の川銀河の数値シミュレーションを軸に、従来からよく行われてきた天体観測との比較に加え、地球科学分野にあたる隕石や小惑星物質解析との比較も行う、新たな学際研究である。そして、1)46億年前の太陽系の出生地とその周囲環境、2)銀河円盤内における46億年間の太陽系移動の解明を目指す。

Outline of Final Research Achievements

Stars in the Galactic disc, including the Solar system, have deviated from their birth orbits and have experienced radial mixing and vertical heating. By performing hydrodynamical simulations of a galactic disc, we investigate how much tracer particles, which are initially located in the disc to mimic newborn stars and the disc stars, are displaced from initial near-circular orbits by gravitational interactions with giant molecular clouds (GMCs). We investigate the time evolution of the radial and vertical velocity dispersion and find that they keep fast and efficient disc heating for 1 Gyr. We find that the efficient stellar scattering by GMCs also causes a change in angular momentum for each star and, therefore, radial migration of more than 1 kpc in the radial direction for 1 Gyr. This effect is more pronounced in newborn stars than old disc stars. The dynamical heating and radial migration drastically occur in the first several hundred Myr.

Academic Significance and Societal Importance of the Research Achievements

太陽系が誕生した46億年前から現在に至るまで、銀河円盤内における太陽系やその他恒星の移動についての理解を目指す本研究は、隕石分析や小惑星探査機「はやぶさ2」などが持ち帰った小惑星資料の解析による太陽系形成研究と、ALMA電波望遠鏡やすばる望遠鏡などによる系外惑星研究を繋ぐ橋渡しの役割を担うという学術的意義を持つ。また、太陽系が天の川銀河のどこで生まれ、どのように彷徨い、今現在どのような所に存在し、そして今後どこに向かうのかを理解することは天文学や惑星科学の学術範囲を超え、広く人類にとっての社会的意義を持つ。

Report

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

    (8 results)

All 2024 2023

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] Efficient radial migration by giant molecular clouds in the first several hundred Myr after the stellar birth2023

    • Author(s)
      Fujimoto Yusuke、Inutsuka Shu-ichiro、Baba Junichi
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 523 Issue: 2 Pages: 3049-3068

    • DOI

      10.1093/mnras/stad1612

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Short-Lived Radionuclides in Meteorites and the Sun's Birth Environment2023

    • Author(s)
      Desch, S. J.; Young, E. D.; Dunham, E. T.; Fujimoto, Y.; Dunlap, D. R.
    • Journal Title

      Astronomical Society of the Pacific Conference Series

      Volume: 9 Pages: 759-798

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 星形成から数100Myrの短時間に起こる、巨大分子雲による円盤加熱と恒星の動径移動2024

    • Author(s)
      藤本裕輔
    • Organizer
      天の川銀河研究会2024
    • Related Report
      2023 Annual Research Report
  • [Presentation] Efficient radial migration by giant molecular clouds in the first several hundred Myr after the stellar birth2023

    • Author(s)
      Fujimoto Yusuke
    • Organizer
      The 2023 Asia-Pacific Regional IAU Meeting
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 星形成から数100Myrの短時間に起こる、巨大分子雲による円盤加熱と恒星の動径移動2023

    • Author(s)
      藤本裕輔
    • Organizer
      日本天文学会2023年秋季年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Galaxy evolution and Solar system formation connected by numerical galaxy simulations of short-lived radioactive nuclides2023

    • Author(s)
      藤本裕輔
    • Organizer
      TJR研究会「階層をつなぐ科学:宇宙から生命まで」
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] 巨大分子雲の重力散乱による太陽系移動2023

    • Author(s)
      藤本裕輔
    • Organizer
      新学術領域「新しい星形成理論によるパラダイムシフト」大研究会2023
    • Related Report
      2022 Research-status Report
  • [Presentation] 地質学的試料に残る超新星起源の60Feと銀河化学進化シミュレーションで探る太陽系の周囲環境2023

    • Author(s)
      藤本裕輔
    • Organizer
      新学術「地下宇宙」第9回超新星ニュートリノ研究会
    • Related Report
      2022 Research-status Report

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Published: 2022-09-01   Modified: 2025-01-30  

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