Towards precision planet evolution model from transiting planets

2017 Fiscal Year Final Research Report

• Project/Area Number: 24340035
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: The University of Tokyo
• Principal Investigator: Suto Yasushi 東京大学, 大学院理学系研究科(理学部), 教授 (90183053)
• Co-Investigator(Kenkyū-buntansha): 樽家 篤史 京都大学, 基礎物理学研究所, 准教授 (40334239)
• Project Period (FY): 2012-04-01 – 2018-03-31
• Keywords: トランジット惑星 / 星震学 / ロシターマクローリン効果 / 自転公転角 / 惑星リング / 太陽系外惑星 / ケプラー探査機

Outline of Final Research Achievements

1) We detected the Rossiter-Mclaughlin effect for the transiting multi-planetary system KOI-94 for the first time, and found that its spin and orbital axes are well aligned. Furthermore we discover that it is the first example to exhibit planet-planet eclipse.
2) The Rossiter-Mclaughlin effect measures the spin-orbit angle projected on the sky. The asteroseismology complementary measures the spin inclination along the line of sight of the observer. We estimated the spin inclinations of Kepler-25 and HAT-P-7 from asteroseismology, and reproduced the true spin-orbits angles for the systems.
3) We performed systematic surveys of exo-rings around Kepler candidates of transiting planets. We found an interesting candidate for a long-period planet, and obtained statistical upper limits on the size and occurrence rate of exo-rings for short-period planets.

Free Research Field

太陽系外惑星