Chemical Diversity of Protoplanetary Systems and its Evolution

2017 Fiscal Year Final Research Report

• Project Area: Evolution of molecules in space: from interstellar clouds to proto-planetary nebulae
• Project/Area Number: 25108005
• 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: The University of Tokyo
• Principal Investigator: Yamamoto Satoshi 東京大学, 大学院理学系研究科(理学部), 教授 (80182624)
• Co-Investigator(Kenkyū-buntansha): 坂井 南美 国立研究開発法人理化学研究所, 主任研究員研究室等, 主任研究員 (70533553) ; 酒井 剛 電気通信大学, 大学院情報理工学研究科, 准教授 (20469604) ; 渡邉 祥正 筑波大学, 数理物質系, 助教 (20586929) ; 高野 秀路 日本大学, 工学部, 教授 (00222084) ; 廣田 朋也 国立天文台, 水沢VLBI観測所, 助教 (10325764) ; 前澤 裕之 大阪府立大学, 理学(系)研究科(研究院), 准教授 (00377780) ; 小嶋 崇文 国立天文台, 先端技術センター, 助教 (00617417) ; 鵜澤 佳徳 国立天文台, 先端技術センター, 准教授 (00359093)
• Project Period (FY): 2013-06-28 – 2018-03-31
• Keywords: 星形成 / 惑星系形成 / 星間物質 / 電波天文学 / 星間化学

Outline of Final Research Achievements

A thorough understanding of chemical evolution from star-forming cores to planet-forming regions is an important subject which is directly related to an understanding of the chemical origin of the Solar System. In this study, we have tackled this problem with the state-of-the-art radio telescopes including ALMA. The major results are as follows. (1) We have revealed chemical diversity of protostellar sources on the basis of the unbiased survey toward many sources in a single molecular cloud. (2) We have confirmed that the chemical diversity is indeed inherited to the planet forming scale. (3) We have discovered the centrifugal barrier of the infalling rotating envelope around a young protostar, and (4) found a drastic chemical change there. These are all important results completely renewing the conventional view of chemical processes occurring in the planet-forming region.

Free Research Field

天文学