Formation and evolution of organic materials in protoplanetary disks

2017 Fiscal Year Final Research Report

• Project Area: Evolution of molecules in space: from interstellar clouds to proto-planetary nebulae
• Project/Area Number: 25108003
• 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 (2016-2017); The University of Tokyo (2013-2015)
• Principal Investigator: Nagahara Hiroko 東京工業大学, 地球生命研究所, フェロー (80172550)
• Co-Investigator(Kenkyū-buntansha): 為則 雄祐 公益財団法人高輝度光科学研究センター, 利用研究促進部門, 主席研究員 (10360819) ; 星野 真人 公益財団法人高輝度光科学研究センター, 利用研究促進部門, 研究員 (30508461) ; 青木 貞雄 一般財団法人総合科学研究機構(総合科学研究センター(総合科学研究室)及び中性子科学センター(研究開発, 総合科学研究センター, 主任研究員 (50016804) ; 木村 勇気 北海道大学, 低温科学研究所, その他 (50449542) ; 高橋 修 広島大学, サステナブル・ディベロップメント実践研究センター, 特任講師 (60253051) ; 渡辺 紀生 筑波大学, 数理物質系, 講師 (80241793) ; 土山 明 京都大学, 理学研究科, 教授 (90180017)
• Project Period (FY): 2013-06-28 – 2018-03-31
• Keywords: 原始惑星系円盤 / 有機物 / 表面反応 / 顕微XANES装置

Outline of Final Research Achievements

Formation of organic molecules on the surface of solid materials in protoplanetary disks are experimentally performed. Gas species are hydrogen and carbon oxide, the two most abundant species, and the solids are Fe-, Ni-, and FeNi- metals and amorphous silicate. Methane and linear chain compound are formed. The reaction takes place at lower temperatures on ice than that on amorphous silicates.
Micro-XANES equipment has been developed in a beam line of Spring-8 in order to observe organics formation reactions in situ and analyze the chemical bonds. The new equipment enables us to observe and analyze organic and inorganic materials by using energy edges, which was used for the experimental samples by other teams of the current research project. Theoretical study on the surface of silicates, metals, and amorphous silicate were conducted on the basis of the first principle calcuration. A new physico-chemical model on the solar system evolution has been developed.

Free Research Field

惑星科学