Published in
Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 1(490), p. 698-708, 2019
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Radial velocity confirmation of K2-100b: a young, highly irradiated, and low-density transiting hot Neptune
,
S. Aigrain ,
D. Kubyshkina ,
D. Gandolfi ,
J. Livingston ,
M. C. V. Fridlund ,
L. Fossati ,
J. Korth,
H. Parviainen ,
L. Malavolta ,
E. Palle,
H. J. Deeg ,
G. Nowak,
V. M. Rajpaul ,
N. Zicher
and other authors.
Full text: Unavailable
Abstract
ABSTRACT We present a detailed analysis of HARPS-N radial velocity observations of K2-100, a young and active star in the Praesepe cluster, which hosts a transiting planet with a period of 1.7 d. We model the activity-induced radial velocity variations of the host star with a multidimensional Gaussian Process framework and detect a planetary signal of 10.6 ± 3.0 ${\rm m\, s^{-1}}$, which matches the transit ephemeris, and translates to a planet mass of 21.8 ± 6.2 M⊕. We perform a suite of validation tests to confirm that our detected signal is genuine. This is the first mass measurement for a transiting planet in a young open cluster. The relatively low density of the planet, $2.04 _{ - 0.61 } ^ { + 0.66 }$ ${\rm g\, cm^{-3}}$, implies that K2-100b retains a significant volatile envelope. We estimate that the planet is losing its atmosphere at a rate of $10^{11}\!-\!10^{12}\, {\rm g\, s^{-1}}$ due to the high level of radiation it receives from its host star.
