Orbital evolution of high-speed planetesimals generated by the Jovian formation and their effects on surrounding materials

• Project/Area Number: 17K05642
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: Kurume University
• Principal Investigator: Nagasawa Makiko 久留米大学, 医学部, 教授 (00419847)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: 惑星形成・進化

Outline of Final Research Achievements

When Jupiter is formed, its gravity increases the speed of the surrounding planetesimals. High-speed planetesimals generate shock waves in the protoplanetary disk and heat the material in the disk. From orbital integration, we investigated the conditions under which planetesimals would be the heat source for crystalline silicates and chondrules. We found that planetesimals larger than 100 km can form crystalline silicates and chondrules, provided that Jovian planet has current Jovian parameters.

Academic Significance and Societal Importance of the Research Achievements

太陽系形成初期に固体微粒子から惑星が形成される過程では，惑星の物理的な成長だけではなく，様々な物質科学的な進化が起きたと考えられている。しかし，天体力学的な惑星進化と物質進化の関係は，これまで統一的には理解されていなかった。本研究では微惑星の天体力学的な運動と，シリケイトの結晶化や，コンドリュール形成のダストの物理化学進化の関係の一端を明らかにした。

Research Products

• [Journal Article] Organicmoleculesandsulfur-bearingmoleculesinprotoplanetarydisks : modelingandALMAobservations (2020)
  • Author(s): 野村英子、樋口あや、坂井南美、山本智、長沢真樹子、田中今日子、三浦均、中本泰史、田中秀和、山本哲生、Catherine Walsh、Tom J. Millar
  • Journal Title: 低温科学 Volume: 78 Pages: 165-172
  • DOI: 10.14943/lowtemsci.78.165
  • NAID: 120006841084
  • ISSN: 1880-7593
  • Year and Date: 2020-03-24
  • Peer Reviewed / Open Access
• [Journal Article] Heating, evaporation, and re-condensation of planetesimals and dusts due to planetesimal bow shock waves (2020)
  • Author(s): 田中今日子、長澤真樹子、三浦均、田中秀和、野村英子、中本泰史、山本哲生
  • Journal Title: 低温科学 Volume: 78 Pages: 191-197
  • DOI: 10.14943/lowtemsci.78.191
  • NAID: 120006841087
  • ISSN: 1880-7593
  • Year and Date: 2020-03-24
  • Peer Reviewed / Open Access
• [Journal Article] Influence of general-relativity effects, dynamical tides, and collisions on planet-planet scattering close to the star (2019)
  • Author(s): Marzari F.、Nagasawa M.
  • Journal Title: Astronomy & Astrophysics Volume: 625 Pages: A121-A121
  • DOI: 10.1051/0004-6361/201935065
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Shock-generating Planetesimals Perturbed by a Giant Planet in a Gas Disk (2019)
  • 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
  • Peer Reviewed / Open Access
• [Presentation] 中心星近傍での木星型惑星の軌道散乱 (2019)
  • Author(s): 長澤真樹子
  • Organizer: 日本天文学会
• [Presentation] 微粒子の加熱に寄与する高速度微惑星の形成条件 (2018)
  • Author(s): 長澤真樹子
  • Organizer: 日本惑星科学会
• [Presentation] 系外惑星による系外小惑星の散乱と蒸発 (2017)
  • Author(s): 長澤真樹子，田中今日子，野村英子
  • Organizer: 日本天文学会2017年秋季年会