Possibility of the evaporation of planetesimals in the protoplanetary disk

• Project/Area Number: 25610133
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Solid earth and planetary physics
• Research Institution: Kurume University (2015); Tokyo Institute of Technology (2013-2014)
• Principal Investigator: Nagasawa Makiko 久留米大学, 医学部, 准教授 (00419847)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000); Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: 惑星起源・進化

Outline of Final Research Achievements

When the relative velocity between a planetesimal and the gas disk exceeds the speed of sound of the gas, a bow shock is produced. We find that the velocities relative to the gas disk of planetesimals a few hundred kilometers in size exceed 10 km/s in the asteroid region due to the mean-motion resonance and the secular resonance of a Jovian planet. The shock is enough strong to cause the evaporation of icy planetesimal. Our results also suggest that chondrules were produced effectively by the bow shocks.

Research Products

• [Journal Article] REVISITING JOVIAN-RESONANCE INDUCED CHONDRULE FORMATION (2014)
  • Author(s): M. Nagasawa , K. K. Tanaka, H. Tanaka, T. Nakamoto, H. Miura, and T. Yamamoto
  • Journal Title: The Astrophysical Journal Letters Volume: 794 Issue: 1 Pages: 1-5
  • DOI: 10.1088/2041-8205/794/1/l7
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Characterization of the KOI-94 System with Transit Timing Variation Analysis: Implication for the Planet-Planet Eclipse (2013)
  • Author(s): K.Masuda et al.
  • Journal Title: The Astrophysical Journal Volume: 778 Issue: 2 Pages: 185-185
  • DOI: 10.1088/0004-637x/778/2/185
  • Peer Reviewed
• [Presentation] 惑星散乱と潮汐相互作用 (2015)
  • Author(s): 長澤真樹子
  • Organizer: 日本惑星科学会2015年秋季講演会
  • Place of Presentation: 東京工業大学
  • Year and Date: 2015-10-15
• [Presentation] 木星の共鳴による微惑星の軌道進化 (2014)
  • Author(s): 長沢真樹子
  • Organizer: 日本惑星科学会2014年秋季講演会
  • Place of Presentation: 東北大学片平キャンパス
  • Year and Date: 2014-09-24
• [Presentation] 原始惑星系円盤内で高速になる微小天体の軌道進化
  • Author(s): 長沢真樹子
  • Organizer: 日本惑星科学会2013年秋季講演会
  • Place of Presentation: 石垣島市民会館（沖縄県）