2023 Fiscal Year Final Research Report

Theory for the Formation of Planetary Systems from Diverse Protoplanetary Disks

Planned Research

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Project Area	A Paradigm Shift by a New Integrated Theory of Star Formation: Exploring the Expanding Frontier of Habitable Planetary Systems in Our Galaxy
Project/Area Number	18H05438
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	National Astronomical Observatory of Japan
Principal Investigator	Kokubo Eiichiro 国立天文台, 天文シミュレーションプロジェクト, 教授 (90332163)
Co-Investigator(Kenkyū-buntansha)	田中秀和東北大学, 理学研究科, 教授 (00282814) 長澤真樹子久留米大学, 医学部, 教授 (00419847) 小林浩名古屋大学, 理学研究科, 准教授 (40422761) 井田茂東京工業大学, 地球生命研究所, 教授 (60211736) 奥住聡東京工業大学, 理学院, 准教授 (60704533)
Project Period (FY)	2018-06-29 – 2023-03-31
Keywords	惑星形成 / 太陽系 / 系外惑星
Outline of Final Research Achievements	Through theoretical studies using computer simulations, we clarified (1) the elementary processes of (1) planetesimal formation and (2) planet formation, and integrated them to study (3) the general planet formation theory and the origin of the solar system. (1) We have obtained the results: the construction of a model of dust growth and migration, the construction of a model of dust impact coalescence and destruction and pebble formation, and the comparison of the integrated model of dust, planetesimals, and pebbles with disk observations. (2) We also obtained results on the collision and destruction processes of planetesimals, the accretion from planetesimal rings, the accretion of planetesimals taking into account the migration of materials, the formation of gas planets, and the formation of close-in super-Earth systems. (iii) We developed a planet population synthesis model and a statistical planet formation model that incorporate the elementary processes we have elucidated.
Free Research Field	惑星系形成論
Academic Significance and Societal Importance of the Research Achievements	生命を宿す可能性のある天体である惑星の形成過程を理解することは、現代天文学の重要課題の一つである。惑星は恒星周りのガスとダストからなる原始惑星系円盤から形成される。本研究では、計算機シミュレーションを用いて、ダストからの微惑星の形成と微惑星からの惑星の形成の様々な素過程を明らかにした。そしてこれらの素過程を組み合わせることで、多様な原始惑星系円盤に適用可能なダストから惑星までの形成モデルを構築した。