文章基本信息

标题：Spin–Orbit Misalignment and Precession in the Kepler-13Ab Planetary System
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作者：Miranda K. Herman ; Ernst J. W. de Mooij ; Chelsea X. Huang 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：1
页码：1-8
DOI：10.3847/1538-3881/aa991f
语种：English
出版社：American Institute of Physics
摘要：Gravity darkening induced by rapid stellar rotation provides us with a unique opportunity to characterize the spin–orbit misalignment of a planetary system through analysis of its photometric transit. We use the gravity-darkened transit modeling code simuTrans to reproduce the transit light curve of Kepler-13Ab by separately analyzing phase-folded transits for 12 short-cadence Kepler quarters. We verify the temporal change in impact parameter indicative of spin–orbit precession identified by Szabó et al. and Masuda, reporting a rate of change db dt = (-4.1  0.2) ´ 10-5 day−1. We further investigate the effect of light dilution on the fitted impact parameter and find that less than 1% of additional light is sufficient to explain the seasonal variation seen in the Kepler quarter data. We then extend our precession analysis to the phase curve data from which we report a rate of change db dt = (-3.2  1.3) ´ 10-5 day−1. This value is consistent with that of the transit data at a lower significance and provides the first evidence of spin–orbit precession based solely on the temporal variation of the secondary eclipse.
关键词：planets and satellites: individual (Kepler-13, KOI-13);stars: rotation;techniques: photometric