| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| 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.
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