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Thermal evolution modeling of planetesimals using thermal infared observation of asteroids

Research Project

Project/Area Number 20K14547
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 17010:Space and planetary sciences-related
Research InstitutionJapan Aerospace EXploration Agency (2022-2023)
Rikkyo University (2020-2021)

Principal Investigator

Sakatani Naoya  国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 特任助教 (70795187)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords小惑星 / 熱進化 / 熱慣性 / 赤外カメラ / リュウグウ / 空隙率 / 焼結体 / 熱伝導率 / 小天体 / 微惑星 / 熱物性
Outline of Research at the Start

小惑星リュウグウを探査したはやぶさ2の中間赤外カメラの観測によって、小惑星上には高空隙率の岩塊が大量に存在することが明らかになった。本研究では、小惑星母天体である微惑星の熱進化(ダストの焼結)が中途半端に進行したことによって、強度を持ちつつ高空隙率の岩石が形成されたという仮説を立て、その実証を行う。ダスト焼結体の熱物性計測実験、およびその結果を用いて様々な初期条件の微惑星の熱進化・内部構造計算を行う。これにより小惑星リュウグウの岩塊密度を作るための微惑星条件を制約し、母天体の姿に迫る。

Outline of Final Research Achievements

The objective of this study is to develop a method to reveal the thermal evolution and internal structural evolution of the parent body (planetesimal) based on the observation data of asteroid Ryugu by the Hayabusa2 thermal infrared imager TIR. Using high-resolution TIR data, we succeeded in determining the thermal inertia of boulders on Ryugu's surface and the porosity based on empirical relationship between the thermal conductivity and porosity. In the calculations of the thermal evolution of the planetesimals, the porosity distribution of the evolved parent body was estimated by incorporating the consolidation process of the porous dust aggregates into the calculations. By matching these Ryugu observations with the results of the parameter study of the thermal evolution calculations, it was shown that the size and formation age of the parent body can be constrained.

Academic Significance and Societal Importance of the Research Achievements

これまでも微惑星がいつ形成したのか、どのようなサイズだったのかは、隕石の観察データを用いて議論されてきた。それらは同位体組成や鉱物学的な情報に基づくものであり、サンプルが地上にないと分かり得ないものであった。それに対し、本研究の手法は、リモートセンシングデータのみに基づいた推定手法を提案した。これはサンプルリターンでなくとも、小惑星の母天体の情報を得ることができることを意味しており、特に小天体赤外観測のポテンシャルを一段と向上させる成果である。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (18 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (5 results) Journal Article (8 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 8 results,  Open Access: 5 results) Presentation (4 results) (of which Int'l Joint Research: 3 results) Remarks (1 results)

  • [Int'l Joint Research] ルレオ工科大学(スウェーデン)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] ドイツ航空宇宙センター/マックスプランク宇宙物理学研究所/ベルリン大学(ドイツ)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] ドイツ航空宇宙センター/マックスプランク宇宙物理学研究所/ハイデルベルク大学(ドイツ)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] コートダジュール天文台(フランス)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] ルレオ工科大学(スウェーデン)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Overview of the search for signs of space weathering on the low-albedo asteroid (101955) Bennu2023

    • Author(s)
      Clark B.E.、Sen A.、Zou X.-D.、DellaGiustina D.N.、Sugita S. et al.
    • Journal Title

      Icarus

      Volume: 400 Pages: 115563-115563

    • DOI

      10.1016/j.icarus.2023.115563

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Measurement of Microscopic Thermal Diffusivity Distribution for Ryugu Sample by Infrared Lock-in Periodic Heating Method2023

    • Author(s)
      Ishizaki Takuya、Nagano Hosei、Tanaka Satoshi、et al.
    • Journal Title

      International Journal of Thermophysics

      Volume: 44 Issue: 4 Pages: 1-20

    • DOI

      10.1007/s10765-023-03158-6

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Development of Numerical Model of the Thermal State of an Asteroid with Locally Rough Surface and Its Application2022

    • Author(s)
      Senshu Hiroki、Sakatani Naoya、Morota Tomokatsu、Yokota Yasuhiro、Shimaki Yuri、Maximilian Hamm、Tanaka Satoshi、Okada Tatsuaki、Arai Takehiko、Takeuchi Hiroshi
    • Journal Title

      International Journal of Thermophysics

      Volume: 43 Issue: 7 Pages: 1-19

    • DOI

      10.1007/s10765-022-03030-z

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Characterization of the MASCOT landing area by Hayabusa22022

    • Author(s)
      Schroder Stefan、Sakatani Naoya、Honda Rie、Tatsumi Eri、Yokota Yasuhiro、Domingue Deborah、Cho Yuichiro、Kameda Shingo、Kitazato Kohei、Kouyama Toru ... Yabuta Hikaru ... et al.
    • Journal Title

      Astronomy & Astrophysics

      Volume: 666 Pages: A164-A164

    • DOI

      10.1051/0004-6361/202244059

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Measurement of Thermal Diffusivity Distribution for Murray and Murchison Meteorites Using Lock-in Thermography2022

    • Author(s)
      Ishizaki Takuya、Kawahara Takeru、Tomioka Kota、Tanaka Satoshi、Sakatani Naoya、Nakamura Tomoki、Nagano Hosei
    • Journal Title

      International Journal of Thermophysics

      Volume: 43 Issue: 7

    • DOI

      10.1007/s10765-022-03026-9

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Development of a Small-Sized Line Heat Source Apparatus for the Thermal Conductivity Measurement of Extraterrestrial Soils2022

    • Author(s)
      Sakatani Naoya、Tanaka Satoshi、Arakawa Sota
    • Journal Title

      International Journal of Thermophysics

      Volume: 43 Issue: 6 Pages: 89-89

    • DOI

      10.1007/s10765-022-03007-y

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Spectrally blue hydrated parent body of asteroid (162173) Ryugu2021

    • Author(s)
      Tatsumi Eri、Sakatani Naoya、Riu Lucie、Matsuoka Moe、et al.
    • Journal Title

      Nature Communications

      Volume: 12 Issue: 1 Pages: 5837-5837

    • DOI

      10.1038/s41467-021-26071-8

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Anomalously porous boulders on (162173) Ryugu as primordial materials from its parent body2021

    • Author(s)
      N. Sakatani, S. Tanaka, T. Okada, et al.
    • Journal Title

      Nature Astronomy

      Volume: - Issue: 8 Pages: 766-774

    • DOI

      10.1038/s41550-021-01371-7

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Local variation in thermal inertia around the aritficial impact crater on Ryugu2021

    • Author(s)
      Naoya Sakatani, Satoshi Tanaka, Tatsuaki Okada, et al.
    • Organizer
      Japan Geoscience Union
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] ANOMALOUSLY POROUS AND DARK ROCKS ON ASTEROID (162173) RYUGU.2021

    • Author(s)
      N. Sakatani, S. Tanaka, T. Okada, et al.
    • Organizer
      Lunar and Planetary Science Conference
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Thermophysical property of the artificial impact crater on asteroid Ryugu2020

    • Author(s)
      N. Sakatani, S. Tanaka, T. Okada, et al.
    • Organizer
      Japan Geophysical Union
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Anomalously porous, dark, and primitive boulders on asteroid Ryugu2020

    • Author(s)
      坂谷尚哉, 田中智,岡田達明,他
    • Organizer
      日本惑星科学会秋季講演会
    • Related Report
      2020 Research-status Report
  • [Remarks] 小惑星探査機「はやぶさ2」観測成果論文の Nature Astronomy 誌掲載について

    • URL

      https://www.jaxa.jp/press/2021/05/20210525-1_j.html

    • Related Report
      2021 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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