文章基本信息

标题：Three Small Planets Transiting the Bright Young Field Star K2-233
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作者：Trevor J. David ; Ian J. M. Crossfield ; Björn Benneke 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：5
页码：1-9
DOI：10.3847/1538-3881/aabde8
语种：English
出版社：American Institute of Physics
摘要：We report the detection of three small transiting planets around the young K3 dwarf K2-233 (2MASS J15215519 −2013539) from observations during Campaign 15 of the K2 mission. The star is relatively nearby (d=69 pc) and bright (V=10.7 mag, Ks=8.4 mag), making the planetary system an attractive target for radial velocity follow-up and atmospheric characterization with the James Webb Space Telescope. The inner two planets are hot super-Earths (Rb=1.40 ± 0.06 RÅ, Rc=1.34 ± 0.08 RÅ), while the outer planet is a warm sub-Neptune (Rd=2.6 ± 0.1 RÅ). We estimate the stellar age to be - 360+140 490 Myr based on rotation, activity, and kinematic indicators. The K2-233 system is particularly interesting given recent evidence for inflated radii in planets around similarly aged stars, a trend potentially related to photo-evaporation, core cooling, or both mechanisms.
关键词：planetary systems;planets and satellites: gaseous planets;planets and satellites: physical evolution;planets and satellites: terrestrial planets;stars: individual (EPIC 249622103)