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)
