文章基本信息

标题：Stellar Spin–Orbit Alignment for Kepler-9, a Multi-transiting Planetary System with Two Outer Planets Near 2:1 Resonance
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作者：Songhu Wang ; Brett Addison ; Debra A. Fischer 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2018
卷号：155
期号：2
页码：1-6
DOI：10.3847/1538-3881/aaa2fb
语种：English
出版社：American Institute of Physics
摘要：We present spectroscopic measurements of the Rossiter–McLaughlin effect for the planet b of the Kepler-9 multitransiting planetary system. The resulting sky-projected spin–orbit angle is λ=−13°±16°, which favors an aligned system and strongly disfavors highly misaligned, polar, and retrograde orbits. Including Kepler-9, there are now a total of four Rossiter–McLaughlin effect measurements for multiplanet systems, all of which are consistent with spin–orbit alignment.
关键词：methods: observational;planetary systems;planets and satellites: individual (Kepler-9b);stars: individual (Kepler-9);techniques: radial velocities;techniques: spectroscopic