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Three Small Planets Transiting a Hyades Star

Livingston, John H.; Dai, Fei; Hirano, Teruyuki; Gandolfi, Davide; Nowak, Grzegorz; Endl, Michael; Velasco, Sergio; Fukui, Akihiko; Narita, Norio; Prieto-Arranz, Jorge; Barragan, Oscar; Cusano, Felice; Albrecht, Simon; Cabrera, Juan; Cochran, William D.; C

ASTRONOMICAL JOURNAL
2018
VL / 155 - BP / - EP /
abstract
We present the discovery of three small planets transiting K2-136 (LP 358 348, EPIC 247589423), a late K dwarf in the Hyades. The planets have orbital periods of 7.9757 +/- 0.0011, 17.30681(-0.00036)(+0.00034), and 25.5715(-0.0040)(+0.0038) days , and radii of 1.05 +/- 0.16, 3.14 +/- 0.36, and 1.55(-0.21)(+0.24) R-circle plus, respectively. With an age of 600-800 Myr, these planets are some of the smallest and youngest transiting planets known. Due to the relatively bright (J = 9.1) host star, the planets are compelling targets for future characterization via radial velocity mass measurements and transmission spectroscopy. As the first known star with multiple transiting planets in a cluster, the system should be helpful for testing theories of planet formation and migration.

AccesS level

Green submitted, Green published

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