TWO HOT JUPITERS FROM K2 CAMPAIGN 4

Abstract

We confirm the planetary nature of two transiting hot Jupiters discovered by the Kepler   spacecraft’s K2 extended mission in its Campaign 4, using precise radial velocity measurements from FIES@NOT, HARPS-N@TNG, and the coudé spectrograph on the McDonald Observatory 2.7 m telescope. K2-29 b (EPIC 211089792b) transits a K1V star with a period of 3.2589263 ± 0.0000015 days; its orbit is slightly eccentric ( e = 0.084 − 0.023 + 0.032 ). It has a radius of R P = 1.000 − 0.067 + 0.071 R J and a mass of M P = 0.613 − 0.026 + 0.027 M J . Its host star exhibits significant rotational variability, and we measure a rotation period of P rot = 10.777 ± 0.031 days. K2-30 b (EPIC 210957318 b) transits a G6V star with a period of 4.098503 ± 0.000011 days. It has a radius of R P = 1.039 − 0.051 + 0.050 R J and a mass of M P = 0.579 − 0.027 + 0.028 M J . The star has a low metallicity for a hot Jupiter host, [ Fe / H ] = − 0.15 ± 0.05 .