文章基本信息

标题：A Hot Saturn Near (but Unassociated with) the Open Cluster NGC 1817
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作者：Rayna Rampalli ; Andrew Vanderburg ; Allyson Bieryla 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2019
卷号：158
期号：2
页码：1-8
DOI：10.3847/1538-3881/ab27c2
语种：English
出版社：American Institute of Physics
摘要：We report on the discovery of a hot Saturn-sized planet (9.916±0.985R ⊕ ) around a late F-star, K2-308, observed in Campaign 13 of the K2 mission. We began studying this planet candidate because prior to the release of Gaia DR2, the host star was thought to have been a member ( 90% membership probability) of the »1 Gyr open cluster NGC 1817 based on its kinematics and photometric distance. We identify the host star (among three stars within the K2 photometric aperture) using seeing-limited photometry and rule out false-positive scenarios using adaptive optics imaging and radial velocity observations. We statistically validate K2-308b by calculating a false-positive probability rate of 0.01% . However, we also show using new kinematic measurements provided by Gaia DR2 and our measured radial velocity of the system that K2-308 is unassociated with the cluster NGC 1817. Therefore, the long running search for a giant transiting planet in an open cluster remains fruitless. Finally, we note that our use of seeing-limited photometry is a good demonstration of similar techniques that are already being used to follow up Transiting Exoplanet Survey Satellite (TESS) planet candidates, especially in crowded regions.
关键词：planetary systems;planets and satellites: detection;stars: individual (K2-308)