Three Small Planets Transiting the Bright Young Field Star K2-233
Author(s)David, Trevor J.; Crossfield, Ian Jm; Benneke, Björn; Petigura, Erik A.; Gonzales, Erica J.; Schlieder, Joshua E.; Yu, Liang; Isaacson, Howard T.; Howard, Andrew W.; Ciardi, David R.; Mamajek, Eric E.; Hillenbrand, Lynne A.; Cody, Ann Marie; Riedel, Adric; Schwengeler, Hans Martin; Tanner, Christopher; Ende, Martin; ... Show more Show less
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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, K[subscript s] = 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 (R[subscript b] = 1.40 ± 0.06 R[subscript ⊕], R[subscript c] = 1.34 ± 0.08 R[subscript ⊕]), while the outer planet is a warm sub-Neptune (R[subscript d] = 2.6 ± 0.1 ). We estimate the stellar age to be 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.
DepartmentMassachusetts Institute of Technology. Department of Physics
American Astronomical Society
David, Trevor J., Ian J. M. Crossfield, Björn Benneke, Erik A. Petigura, Erica J. Gonzales, Joshua E. Schlieder, Liang Yu, et al. “Three Small Planets Transiting the Bright Young Field Star K2-233.” The Astronomical Journal 155, 5 (May 2018): 222 © 2018 American Astronomical Society
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