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Is planetary formation possible from sintered aggregates? Laboratory experiment and numerical simulation

Research Project

Project/Area Number 17K05631
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Solid earth and planetary physics
Research InstitutionNagoya University

Principal Investigator

SIRONO Sin-iti  名古屋大学, 環境学研究科, 准教授 (20332702)

Co-Investigator(Kenkyū-buntansha) 桂木 洋光  名古屋大学, 環境学研究科, 准教授 (30346853)
Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywordsダストアグリゲイト / 焼結 / 微惑星 / 形成場所 / バネ定数 / 衝突 / 微粒子集合体 / 有限要素法 / 力学的応答 / 原始惑星系円盤 / 室内実験 / 数値シミュレーション
Outline of Final Research Achievements

Mechanical properties of dust aggregates strongly affect the first step of planetary formation. If elasticity of an aggregate is large, the collisioncal outcome of aggregates becomes bouncing and growth to planets is prohibited. In this study, elasticity between dust grains was determined as a function of the degree of sintering, which is an efficient mechanism in a protoplanetary nebula. There are four modes of deformation: 1: stretching 2: rolling 3: sliding 4: stretching. The determined elasticity for stretching was smaller than that in previous model. Empirical formulas were derived for the elasticities. The collisional simulation was conducted to check the effect of the modified elasticity. The collisional outcome of numerical simulation was not changed.

Academic Significance and Societal Importance of the Research Achievements

焼結したダストアグリゲイトの弾性率を明らかにし,その結果をもとにして数値シミュレーションを行なったところ,衝突の結果が合体から跳ね返りに転じる可能性が非常に高くなることが明らかとなった.ここから,惑星は焼結が起こらない領域でのみ形成しうると考えられる.惑星の形成場所が焼結によって決定さうるということは,原始惑星系円盤の観測結果からも示唆されている.

Report

(5 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (7 results)

All 2021 2019 2018 2017

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (4 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Elasticity of a Sintered Contact between Dust Grains2021

    • Author(s)
      S. Sirono and D. Kudo
    • Journal Title

      Astrophysical Journal

      Volume: 911 Issue: 2 Pages: 114-114

    • DOI

      10.3847/1538-4357/abec7c

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Collisions between sintered icy dust aggregates2017

    • Author(s)
      Sirono, S. and Ueno, H.
    • Journal Title

      Astrophysical Journal

      Volume: 841 Issue: 1 Pages: 36-36

    • DOI

      10.3847/1538-4357/aa6fad

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Heating of porous icy dust aggregate2017

    • Author(s)
      Sirono, S.
    • Journal Title

      Astrophysical Journal

      Volume: 842 Issue: 1 Pages: 11-11

    • DOI

      10.3847/1538-4357/aa7389

    • NAID

      120006343661

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] 球間焼結ネックの弾性定数2019

    • Author(s)
      城野信一
    • Organizer
      日本惑星科学会2019年秋季講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] Chondrule formation through collisions of rocky and icy planetesimals2018

    • Author(s)
      Sin-iti Sirono
    • Organizer
      42 nd COSPAR Scientific Assembly
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 高空隙率ダストアグリゲイトの温度上昇2017

    • Author(s)
      城野信一
    • Organizer
      JpGU-AGU Joing meeting 2017
    • Related Report
      2017 Research-status Report
  • [Presentation] スノーライン近傍におけるコンドリュールの形成2017

    • Author(s)
      城野信一
    • Organizer
      日本惑星科学会2017年秋季講演会
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2022-01-27  

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