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 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 RJupiter and a mass of Mp=0.613+0.027−0.026 MJupiter. 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 RJupiter and a mass of MP=0.579+0.028−0.027 MJupiter. The star has a low metallicity for a hot Jupiter host, [Fe/H]=−0.15±0.05.
TWO HOT JUPITERS from K2 CAMPAIGN 4
GANDOLFI, Davide;
2016-01-01
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 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 RJupiter and a mass of Mp=0.613+0.027−0.026 MJupiter. 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 RJupiter and a mass of MP=0.579+0.028−0.027 MJupiter. The star has a low metallicity for a hot Jupiter host, [Fe/H]=−0.15±0.05.
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