多様なリング－衛星系の起源・進化の統一的理解に向けた理論研究

• Project/Area Number: 17J01269
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 国内
• Research Field: Solid earth and planetary physics
• Research Institution: Japan Aerospace EXploration Agency (2019); Tokyo Institute of Technology (2017-2018)
• Principal Investigator: 兵頭 龍樹 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, 国際トップヤングフェロー
• Project Period (FY): 2017-04-26 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 衛星 / 惑星 / 太陽系外縁天体 / 太陽系形成 / 火星 / 火星衛星 / 惑星探査 / 小惑星 / 巨大天体衝突 / フォボス・デイモス / 土星リング / 巨大惑星リング / MMX探査 / SPH計算 / N体計算

Outline of Annual Research Achievements

「多様なリング-衛星系の起源・進化の統一的理解に向けた理論研究」に準じ、本研究では、太陽系外縁に存在する冥王星を含む直径1000 km以上の衛星系の形成機構と形成時期に取り組んだ。本研究では、巨大天体衝突によって多様な衛星が形成されるかどうかを数値シミュレーションによって調べた。衝突速度や衝突角度、衝突前の2つの天体の分化状態や組成、質量比などを様々に変化させて、パラメータサーベイを行った。その結果、衝突速度が脱出速度程度と小さく、かつ衝突角度が約45度以上のかすり衝突の場合には、観測される衛星系が形成されうることを明らかにした。本研究は、査読ありの国際学術誌に投稿し、出版されている。

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] パリ地球物理研究所(フランス)
• [Int'l Joint Research] Institut de Physique du Globe/Royal Observatory of Belgium(フランス)
• [Journal Article] Early formation of moons around large trans-Neptunian objects via giant impacts (2019)
  • Author(s): Arakawa, S., Hyodo, R., Genda, H.
  • Journal Title: Nature Astronomy Volume: 3 Issue: 9 Pages: 802-807
  • DOI: 10.1038/s41550-019-0797-9
  • Peer Reviewed / Open Access
• [Journal Article] Transport of impact ejecta from Mars to its moons as a means to reveal Martian history (2019)
  • Author(s): Hyodo Ryuki、Kurosawa Kosuke、Genda Hidenori、Usui Tomohiro、Fujita Kazuhisa
  • Journal Title: Scientific Reports Volume: 9 Issue: 1 Pages: 19833-19833
  • DOI: 10.1038/s41598-019-56139-x
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Implantation of Martian Materials in the Inner Solar System by a Mega Impact on Mars (2018)
  • Author(s): Hyodo Ryuki、Genda Hidenori
  • Journal Title: The Astrophysical Journal Volume: 856 Issue: 2 Pages: 2-2
  • DOI: 10.3847/2041-8213/aab7f0
  • Peer Reviewed / Open Access
• [Journal Article] On the Impact Origin of Phobos and Deimos. IV. Volatile Depletion (2018)
  • Author(s): Hyodo Ryuki、Genda Hidenori、Charnoz Sebastien、Pignatale Francesco C. F.、Rosenblatt Pascal
  • Journal Title: The Astrophysical Journal Volume: 860 Issue: 2 Pages: 150-150
  • DOI: 10.3847/1538-4357/aac024
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] On the Impact Origin of Phobos and Deimos. III. Resulting Composition from Different Impactors (2018)
  • Author(s): Pignatale Francesco C.、Charnoz Sebastien、Rosenblatt Pascal、Hyodo Ryuki、Nakamura Tomoki、Genda Hidenori
  • Journal Title: The Astrophysical Journal Volume: 853 Issue: 2 Pages: 118-118
  • DOI: 10.3847/1538-4357/aaa23e
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Dynamical Evolution of the Debris Disk after a Satellite Catastrophic Disruption around Saturn (2017)
  • Author(s): Hyodo Ryuki、Charnoz Sebastien
  • Journal Title: The Astronomical Journal Volume: 154 Issue: 1 Pages: 34-34
  • DOI: 10.3847/1538-3881/aa74c9
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] On the Impact Origin of Phobos and Deimos. I. Thermodynamic and Physical Aspects (2017)
  • Author(s): Hyodo Ryuki、Genda Hidenori、Charnoz Sebastien、Rosenblatt Pascal
  • Journal Title: The Astrophysical Journal Volume: 845 Issue: 2 Pages: 125-125
  • DOI: 10.3847/1538-4357/aa81c4
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] On the Impact Origin of Phobos and Deimos. II. True Polar Wander and Disk Evolution (2017)
  • Author(s): Hyodo Ryuki、Rosenblatt Pascal、Genda Hidenori、Charnoz Sebastien
  • Journal Title: The Astrophysical Journal Volume: 851 Issue: 2 Pages: 122-122
  • DOI: 10.3847/1538-4357/aa9984
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Planetary and Other Bodies Rings (2017)
  • Author(s): Charnoz Sebastien, Crida Aurelien, Hyodo Ryuki
  • Journal Title: Handbook of Exoplanets Volume: 印刷中
  • Peer Reviewed / Int'l Joint Research
• [Presentation] The fate of the impact-debris produced by a Borealis- forming impact (2019)
  • Author(s): Hyodo Ryuki; Genda Hidenori
  • Organizer: EPSC-DPS Joint Meeting 2019
  • Int'l Joint Research
• [Presentation] On the origin of ring-satellite systems around giant planets (2019)
  • Author(s): Ryuki Hyodo
  • Organizer: he 1st International Workshop for Aquaplanetology
  • Int'l Joint Research / Invited
• [Presentation] 火星衛星フォボスとデイモス：火星からの質量輸送について (2018)
  • Author(s): 兵頭龍樹, 黑澤耕介, 玄田英典, 藤田和央, 臼井寛裕
  • Organizer: 2018 年日本惑星科学会
• [Presentation] 火星衛星の起源と進化について (2018)
  • Author(s): 兵頭龍樹
  • Organizer: 衛星研究会
  • Invited
• [Presentation] On the Origin of Rings around Saturn (2018)
  • Author(s): Ryuki Hyodo
  • Organizer: JpGU 2018
  • Int'l Joint Research / Invited
• [Presentation] On the Origin of Rings around Giant Planets and Small Bodies (2018)
  • Author(s): Ryuki Hyodo
  • Organizer: AOGS 2018
  • Int'l Joint Research / Invited
• [Presentation] Implantation of Martian Materials in the Inner Solar System by a Mega Impact on Mars (2018)
  • Author(s): Ryuki Hyodo, Hidenori Genda
  • Organizer: Symposium on Planetary Science 2019
  • Int'l Joint Research
• [Presentation] Examining accretion process of Phobos and Deimos in giant impact-induced disk (2017)
  • Author(s): 兵頭龍樹
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research / Invited
• [Presentation] On the Origin of Phobos and Deimos in an Impact-Generated Disk (2017)
  • Author(s): Hyodo R., Genda, H., Charnoz, S. & Rosenblatt, P.
  • Organizer: Goldschmidt Conference 2017
  • Int'l Joint Research
• [Presentation] On the Formation of Rings around Giant Planets (2017)
  • Author(s): Hyodo R., Charnoz, S., Genda, H. & Ohtsuki, K.
  • Organizer: American Astronomical Society, DPS meeting #49
  • Int'l Joint Research
• [Presentation] 巨大衝突説から予測される火星衛星の構成粒子について (2017)
  • Author(s): 兵頭龍樹, 玄田英典, Sebastien Charnoz, Jean-Pierre Bibring, 中村智樹, Pascal Rosenblatt
  • Organizer: 2017 年日 本惑星科学会