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Structure Formation of Planetary Systems by Chain Accretion

Research Project

Project/Area Number 16K05304
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Astronomy
Research InstitutionNational Astronomical Observatory of Japan

Principal Investigator

Kokubo Eiichiro  国立天文台, 理論研究部, 教授 (90332163)

Research Collaborator Lin Douglas  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords惑星系形成 / 太陽系 / 惑星集積 / 多体シミュレーション / 理論天文学 / 惑星起源・進化
Outline of Final Research Achievements

The goal of this project is to investigate the elementary process of structure formation of planetary systems with multiple planets along with a working hypothesis "chain accretion scenario" and understand the origin of the orbital architecture of the solar and exoplanetary systems.

We have developed a fast N-body simulation system "planet formation simulator" that consists of an N-body simulation code for planetesimal accretion and a general-purpose graphic processing unit (GPU) that accelerates gravity calculation. The simulation code takes into account the realistic evolution of disk gas and accretionary condition of planetesimals. Using it we are now investigating the effect of the first gas giant on the formation of the second one, namely, the evolution of outer planetesimals, which is the important elementary process of the chain accretion scenario.

Academic Significance and Societal Importance of the Research Achievements

太陽系も含めて、銀河系に存在する多くの惑星系は複数惑星系である。このような惑星系の軌道構造の起源を理解することは惑星系形成論の重要な課題である。惑星系形成の作業仮説である「連鎖集積シナリオ」では最初に形成された巨大惑星がその後の形成過程を支配すると考える。その素過程をシミュレーションによって調べている。この過程を理解することで太陽系の起源に迫ることができる。また、シミュレーションのために開発した GPU を用いたシミュレーションコードは公開予定である。これは今後のこの分野の研究に貢献できると考えている。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (8 results)

All 2019 2018 2017 2016

All Presentation (8 results) (of which Int'l Joint Research: 7 results,  Invited: 6 results)

  • [Presentation] Formation of Terrestrial Planets by Giant Impacts2019

    • Author(s)
      小久保英一郎
    • Organizer
      Solar System | Exoplanet Science Synergies in the Horizon 2061
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Formation of Terrestrial Planets2019

    • Author(s)
      小久保英一郎
    • Organizer
      LIFE3E’2019: SEARCH FOR LIFE, FROM EARLY EARTH TO EXOPLANETS
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] The Standard Scenario of Solar System Formation and its Problems2018

    • Author(s)
      小久保英一郎
    • Organizer
      Asia Oceania Geosciences Society 15th Annual Meeting
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Formation of Terrestial Planets2018

    • Author(s)
      小久保英一郎
    • Organizer
      IAU Symposium 345: Origins: From the Protosun to the First Steps of Life
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Formation of Terrestrial Planets2017

    • Author(s)
      Eiichiro Kokubo
    • Organizer
      Formation of the Solar System and the Origin of Life
    • Place of Presentation
      University of Leiden (The Netherlands)
    • Year and Date
      2017-02-20
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Orbital Architecture of Planetary Systems Formed by Giant Impacts2017

    • Author(s)
      Eiichiro Kokubo
    • Organizer
      Accretion and Early Differentiation of the Earth and Terrestrial Planets
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Orbital Architecture of Close-in Planetary Systems Formed by Giant Impacts2017

    • Author(s)
      Eiichiro Kokubo
    • Organizer
      Exoplanets and Planet Formation
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 巨大衝突によって形成される惑星系の構造2016

    • Author(s)
      小久保英一郎
    • Organizer
      日本惑星科学会
    • Place of Presentation
      ノートルダム清心女子大学(岡山県,岡山市)
    • Year and Date
      2016-09-12
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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