文章基本信息

标题：Decaying Orbit of the Hot Jupiter WASP-12b: Confirmation with TESS Observations
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作者：Jake D.Turner ; Andrew Ridden-Harper ; Ray Jayawardhana 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2021
卷号：161
期号：2
页码：1-12
DOI：10.3847/1538-3881/abd178
语种：English
出版社：American Institute of Physics
摘要：Theory suggests that the orbits of some close-in giant planets should decay due to tidal interactions with their host stars. To date, WASP-12b is the only hot Jupiter reported to have a decaying orbit, at a rate of 29 ± 2 ms yr−1. We analyzed data from NASA's Transiting Exoplanet Survey Satellite (TESS) to verify that WASP-12b's orbit is indeed changing. We find that the TESS transit and occultation data are consistent with a decaying orbit with an updated period of 1.091420090 ± 0.000000041 days and a decay rate of 32.53 ± 1.62 ms yr−1. We find an orbital decay timescale of . If the observed decay results from tidal dissipation, the modified tidal quality factor is , which falls at the lower end of values derived for binary star systems and hot Jupiters. Our result highlights the power of space-based photometry for investigating the orbital evolution of short-period exoplanets.