EPIC 211391664b: A 32 M⊕ Neptune-size Planet in a 10 Day Orbit Transiting an F8 Star

Barragán, Oscar and Grziwa, Sascha and Gandolfi, Davide and Fridlund, Malcolm and Endl, Michael and Csizmadia, Szilárd (2016) EPIC 211391664b: A 32 M⊕ Neptune-size Planet in a 10 Day Orbit Transiting an F8 Star. ASTRONOMICAL JOURNAL, 152 (6). ISSN 0004-6256

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Abstract

We report the discovery of K2-98 b (EPIC 211391664 b), a transiting Neptune-sized planet monitored by the K2 mission during its campaign 5. We combine the K2 time-series data with ground-based photometric and spectroscopic follow-up observations to confirm the planetary nature of the object and derive its mass, radius, and orbital parameters. K2-98 b is a warm Neptune-like planet in a 10-day orbit around a V=12.2 mag F-type star with M?=1.074 ± 0.042 M , R?=1.311+0.083 −0.048 R , and age of 5.2+1.2 −1.0 Gyr. We derive a planetary mass and radius of Mp= 32.2 ± 8.1 M⊕ and Rp=4.3+0.3 −0.2 R⊕. K2-98 b joins the relatively small group of Neptune-sized planets whose both mass and radius have been derived with a precision better than 25 %. We estimate that the planet will be engulfed by its host star in ∼3 Gyr, due to the evolution of the latter towards the red giant branch.

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