Two Hot Jupiters from K2 Campaign 4

Johnson, Marshall C. and Gandolfi, Davide and Fridlund, Malcolm and Csizmadia, Szilárd and Endl, Michael (2016) Two Hot Jupiters from K2 Campaign 4. ASTRONOMICAL JOURNAL, 151 (6). ISSN 0004-6256

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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 coud´e spectrograph on the McDonald Observatory 2.7 m telescope. K2-29 b (EPIC 211089792 b) transits a K1V star with a period of 3.2589263±0.0000015 days; its orbit is slightly eccentric (e = 0.084+0.032 −0.023). It has a radius of RP = 1.000+0.071 −0.067 RJ and a mass of MP = 0.613+0.027 −0.026 MJ . Its host star exhibits significant rotational variability, and we measure a rotation period of Prot = 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 RP = 1.039+0.050 −0.051 RJ and a mass of MP = 0.579+0.028 −0.027 MJ . The star has a low metallicity for a hot Jupiter host, [Fe/H] = −0.15 ± 0.05.

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