Observational study on time variation of angular momentum dissipation in star- and planet-formation processes

2016 Fiscal Year Final Research Report

• Project/Area Number: 26800094
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Astronomy
• Research Institution: National Astronomical Observatory of Japan (2016); The University of Tokyo (2014-2015)
• Principal Investigator: Yasui Chikako 国立天文台, TMT推進室, 助教 (00583626)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 星・惑星形成 / 赤外線天文学 / 原始惑星系円盤

Outline of Final Research Achievements

Stars are formed from the gravitationally induced collapse of molecular gas. Although any small initial rotation of the star-forming cloud is enormously magnified by conservation of angular momentum during collapse, angular momentum dissipation mechanisms have not well established yet. We derived dominant processes in different evolutionary phases of protoplanetary disks with near-infrared high-resolution spectroscopy. As a result, time variation of dominant processes are suggested for the first time: gas ejection by stellar wind is effective in the early phase, while star-disk interaction and gas ejection by disk wind are then effective.

Free Research Field

天文学