Three small planets transiting the bright young field star K2-233
Trevor J. David, Ian J.M. Crossfield, Bj\"orn Benneke, Erik A., Petigura, Erica J. Gonzales, Joshua E. Schlieder, Liang Yu, Howard T., Isaacson, Andrew W. Howard, David R. Ciardi, Eric E. Mamajek, Lynne A., Hillenbrand, Ann Marie Cody, Adric Riedel, Hans Martin Schwengeler,

TL;DR
This paper reports the discovery of three small transiting planets around the young, bright star K2-233, highlighting their potential for follow-up studies and discussing implications for planetary radius inflation mechanisms.
Contribution
First detection of a multi-planet system around a young star using K2 data, with detailed characterization and implications for planetary evolution theories.
Findings
Three transiting planets detected around K2-233
Planets are hot super-Earths and a warm sub-Neptune
System age estimated at approximately 360 million years
Abstract
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 ( = 69 pc) and bright ( = 10.7 mag, = 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 ( = 1.40 0.06 R, = 1.34 0.08 R), while the outer planet is a warm sub-Neptune ( = 2.6 0.1 R). We estimate the stellar age to be 360 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,…
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