Do dust particles move a planet?

2016 Fiscal Year Final Research Report

• Project/Area Number: 25800250
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Solid earth and planetary physics
• Research Institution: Waseda University
• Principal Investigator: ko yamada 早稲田大学, 政治経済学術院, 准教授(任期付) (60424793)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 惑星移動 / ダスト / 円盤ガス / トルク

Outline of Final Research Achievements

Migration for terrestrial planets which are forming in gas disks is one of important issues to systematically understand their orbital evolution. Planet with the order of Earth mass undergoes the decay of its semi-major axis by the interaction between a planet and a disk gas. Previous works indicate that planets move toward their host star. In addition, most studies on the time-evolution of dust particles in disks show that dust particles on the order of mm move from a distant region to an inner planet-forming region of a disk, leading to enhance the dust/gas ratio. The gas flow pattern changes through the exchange of the angular momentum between dust particles and gas. This may influence the total amount of torque exerting a planet. A goal of our study is to examine the effect of dust particles on the planet migration. We find that the inward migration speed may be reduced or vanished with the increase in both the size of a dust particle and the gas/dust ratio.

Free Research Field

惑星形成論