文章基本信息

标题：K2-136: A Binary System in the Hyades Cluster Hosting a Neptune-sized Planet
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作者：David R. Ciardi ; Ian J. M. Crossfield ; Adina D. Feinstein 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：1-11
DOI：10.3847/1538-3881/aa9921
语种：English
出版社：American Institute of Physics
摘要：We report the discovery of a Neptune-size planet (Rp = 3.0 RÅ) in the Hyades Cluster. The host star is in a binary system, comprising a K5V star and M7/8V star with a projected separation of 40 au. The planet orbits the primary star with an orbital period of 17.3 days and a transit duration of 3 hrs. The host star is bright (V = 11.2, J = 9.1) and so may be a good target for precise radial velocity measurements. K2-136Ac is the first Neptune-sized planet to be found orbiting in a binary system within an open cluster. The Hyades is the nearest star cluster to the Sun, has an age of 625–750 Myr, and forms one of the fundamental rungs in the distance ladder; understanding the planet population in such a well-studied cluster can help us understand and set constraints on the formation and evolution of planetary systems.
关键词：planets and satellites: detection;stars: individual (EPIC 247589423AB, K2-136A c, K2-136AB)