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Study of Shock Wave Heating Chondrule Formation Model: Bow-Shocks in Dust-Rich Regions

Research Project

Project/Area Number 15K05266
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Solid earth and planetary physics
Research InstitutionTokyo Institute of Technology

Principal Investigator

Nakamoto Taishi  東京工業大学, 理学院, 教授 (60261757)

Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords惑星形成・進化 / コンドリュール / 隕石 / 惑星形成 / コンドリュール形成 / 微惑星 / 微惑星形成
Outline of Final Research Achievements

We examined a possibility that chondrules, which are one of the main components of meteorites, are formed by bow shocks around fast moving planetesimals in the solar nebula. Especially, we explored cases where dust-to-gas mass ratio is high in the chondrule precursor region. According to our numerical simulations, we found that even in high dust-to-gas mass ratio cases, it seems difficulty for bow shocks to meet the chondrule formation conditions inferred from meteorite observations. Thus, chondrules seem to be formed by mechanisms other than the bow shock.

Academic Significance and Societal Importance of the Research Achievements

コンドリュールは隕石の主要構成要素であり,その形成過程は太陽系惑星の形成過程と密接に関連していると思われる。しかし,コンドリュールの形成過程も惑星の形成過程も,まだ謎である。したがって,コンドリュールの形成過程を明らかにすることは太陽系惑星の形成過程の解明にもつながると思われる。本研究では,残念ながらコンドリュール形成に関して前向きな理解を得るにはいたらなかった。しかしながら,有力視されていた一つの可能性を消すことができたという意味では,前進と捉えることができるだろう。引き続き,関連する研究を進めていくことが必要であると思われる。

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (19 results)

All 2019 2018 2017 2016 2015

All Journal Article (9 results) (of which Peer Reviewed: 9 results,  Open Access: 3 results,  Acknowledgement Compliant: 4 results) Presentation (10 results) (of which Int'l Joint Research: 5 results,  Invited: 2 results)

  • [Journal Article] Thermal conductivity and coordination number of compressed dust aggregates2019

    • Author(s)
      S. Arakawa, M. Tatsuuma, N. Sakatani, T. Nakamoto
    • Journal Title

      Icarus

      Volume: 324 Pages: 8-14

    • DOI

      10.1016/j.icarus.2019.01.022

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Shock-generating Planetesimals Perturbed by a Giant Planet in a Gas Disk2019

    • Author(s)
      Nagasawa M.、Tanaka K. K.、Tanaka H.、Nomura H.、Nakamoto T.、Miura H.
    • Journal Title

      The Astrophysical Journal

      Volume: 871 Issue: 1 Pages: 110-110

    • DOI

      10.3847/1538-4357/aaf795

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Compound chondrule formation in optically thin shock waves2019

    • Author(s)
      Sota Arakawa and Taishi Nakamoto
    • Journal Title

      Astrophysical Journal

      Volume: in press

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Collisional Growth of Icy Dust Aggregates in the Disk Formation Stage: Difficulties for Planetesimal Formation via Direct Collisional Growth outside the Snowline2018

    • Author(s)
      Homma Kenji、Nakamoto Taishi
    • Journal Title

      The Astrophysical Journal

      Volume: 868 Issue: 2 Pages: 118-118

    • DOI

      10.3847/1538-4357/aae0fb

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Thermal conductivity of porous aggregates2017

    • Author(s)
      Arakawa Sota、Tanaka Hidekazu、Kataoka Akimasa、Nakamoto Taishi
    • Journal Title

      Astronomy & Astrophysics

      Volume: 608 Pages: L7-L7

    • DOI

      10.1051/0004-6361/201732182

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Comprehensive study of thermal desorption of grain-surface species by accretion shocks around protostars2017

    • Author(s)
      Hitoshi Miura, Tetsuo Yamamoto, Hideko Nomura, Taishi Nakamoto, Kyoko K. Tanaka, Hidekazu Tanaka, Makiko Nagasawa
    • Journal Title

      The Astrophysical J.

      Volume: 839 Issue: 1 Pages: 47-47

    • DOI

      10.3847/1538-4357/aa67df

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Compound chondrule formation via collision of supercooled droplets2016

    • Author(s)
      Sota Arakawa and Taishi Nakamoto
    • Journal Title

      Icarus

      Volume: 276 Pages: 102-106

    • DOI

      10.1016/j.icarus.2016.04.041

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] ROCKY PLANETESIMAL FORMATION VIA FLUFFY AGGREGATES OF NANOGRAINS2016

    • Author(s)
      Sota Arakawa and Taishi Nakamoto
    • Journal Title

      The Astrophysical Journal Letters

      Volume: 832 Issue: 2 Pages: L19-L19

    • DOI

      10.3847/2041-8205/832/2/l19

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Comparison of Implicit Schemes to Solve Equations of Radiation Hydrodynamics with a Flux-limited Diffusion Approximation: Newton--Raphson, Operator Splitting, and Linearization2016

    • Author(s)
      Tetsu, H. and Nakamoto, T.
    • Journal Title

      Astrophysical Journal Supplement Series

      Volume: 223 Issue: 1 Pages: 14-14

    • DOI

      10.3847/0067-0049/223/1/14

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Chondrule Formation by Lightning in Dust-Rich Environments2018

    • Author(s)
      Kento Sato and Taishi Nakamoto
    • Organizer
      American Geophysical Union, Fall Meeting 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Model for Generation of Isotope Anomalies in the Inner Solar System by Inhomogeneous Molecular Cloud Cor2018

    • Author(s)
      Taishi Nakamoto and Akira Takeishi
    • Organizer
      Meteorites - Understanding the origin of planetodiversity
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 原始惑星系円盤初期進化2017

    • Author(s)
      中本泰史
    • Organizer
      シンポジウム「ダスト形成から惑星の多様性へ:宇宙の物質進化における物理と化学のカップリング」
    • Place of Presentation
      東京大学小柴ホール
    • Year and Date
      2017-03-08
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] Distribution of 54Cr Isotope Anomalies in Asteroid Belt2017

    • Author(s)
      Taishi Nakamoto, Akira Takeishi
    • Organizer
      Japan Geoscience Union Meeting
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 惑星系形成2017

    • Author(s)
      中本泰史
    • Organizer
      天体形成論 ~過去・現在・未来~
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] 原始惑星系円盤形成段階における氷ダストアグリゲイトの合体成長と内部密度進化2017

    • Author(s)
      本間謙二,中本泰史
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Inhomogeneous molecular cloud core and isotope anomalies in meteorites2016

    • Author(s)
      Taishi Nakamoto and Akira Takeishi
    • Organizer
      Goldschmidt 2016
    • Place of Presentation
      パシフィコ横浜
    • Year and Date
      2016-06-26
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Uniform Injection of 54Cr into Solar Nebula and Temporal Change of Isotopic Ratio in Meteorites2016

    • Author(s)
      Taishi Nakamoto and Akira Takeishi
    • Organizer
      日本地球惑星科学連合大会2016
    • Place of Presentation
      幕張メッセ
    • Year and Date
      2016-05-22
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] ダスト・ガス比の高い場合の1次元平行平板衝撃波シミュレーション~コンドリュール形成モデルへの応用に向けて~2015

    • Author(s)
      勝田祐哉, 中本泰史
    • Organizer
      日本惑星科学会
    • Place of Presentation
      東京工業大学
    • Year and Date
      2015-10-14
    • Related Report
      2015 Research-status Report
  • [Presentation] ガス・ダスト混合流体の一次元平行平板衝撃波: 微惑星周りの弧状衝撃波によるコンドリュール形成シミュレーションに向けて2015

    • Author(s)
      勝田祐哉,中本泰史
    • Organizer
      日本地球惑星科学連合大会
    • Place of Presentation
      幕張メッセ
    • Year and Date
      2015-05-24
    • Related Report
      2015 Research-status Report

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Published: 2015-04-16   Modified: 2020-03-30  

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