Formation theory of habitable terrestrial planets

2016 Fiscal Year Final Research Report

• Project Area: New Frontiers of Extrasolar Planets: Exploring Terrestrial Planets
• Project/Area Number: 23103005
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: IDA SHIGERU 東京工業大学, 地球生命研究所, 教授 (60211736)
• Co-Investigator(Kenkyū-buntansha): 長沢 真樹子 東京工業大学, 理工学研究科, 准教授 (00419847) ; 野村 英子 東京工業大学, 理工学研究科, 准教授 (20397821) ; 渡邊 誠一郎 名古屋大学, 環境学研究科, 教授 (50230967) ; 中本 泰史 東京工業大学, 理工学研究科, 教授 (60261757) ; 奥住 聡 東京工業大学, 理工学研究科, 助教 (60704533) ; 犬塚 修一郎 名古屋大学, 理学(系)研究科(研究院), 教授 (80270453) ; 生駒 大洋 東京大学, 理学(系)研究科(研究院), 准教授 (80397025) ; 小久保 英一郎 国立天文台, 理論研究部, 教授 (90332163)
• Project Period (FY): 2011-04-01 – 2016-03-31
• Keywords: 系外惑星 / 星形成 / 原始惑星系円盤 / 理論天文学

Outline of Final Research Achievements

Regarding formation of protostars and protoplanetary disks, we have constructed a new scenario that a disk is formed at the stage of a Jupiter-mass star and the disk fragment into clumps to fall onto the star. Regarding planetesimal formation, through analysis of simultaneous evolution of dust size, porosity and orbit, we found that icy planetesimals are successfully formed. Regarding comparison of theory with observed data, we performed Monte Carlo simulations to reproduce the orbital eccentricity distribution of exoplanets. Our study of planetary atmosphere acquired from the disk could explain diversity of bulk density of extrasolar super-Earths. We also proposed two theoretical models to explain the ring structure in the disks that were revealed by ALMA observations.

Free Research Field

惑星物理学