Bibcode
Barragán, O.; Gandolfi, D.; Smith, A. M. S.; Deeg, H. J.; Fridlund, M. C. V.; Persson, C. M.; Donati, P.; Endl, M.; Csizmadia, Sz; Grziwa, S.; Nespral, D.; Hatzes, A. P.; Cochran, W. D.; Fossati, L.; Brems, S. S.; Cabrera, J.; Cusano, F.; Eigmüller, Ph; Eiroa, C.; Erikson, A.; Guenther, E.; Korth, J.; Lorenzo-Oliveira, D.; Mancini, L.; Pätzold, M.; Prieto-Arranz, J.; Rauer, H.; Rebollido, I.; Saario, J.; Zakhozhay, O. V.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 475, Issue 2, p.1765-1776
Advertised on:
4
2018
Citations
19
Refereed citations
17
Description
We announce the discovery of K2-139 b (EPIC 218916923 b), a transiting
warm-Jupiter (Teq = 547 ± 25 K) on a 29-d orbit around
an active (log R^' _HK = -4.46 ± 0.06) K0 V star in K2 Campaign
7. We derive the system's parameters by combining the K2 photometry with
ground-based follow-up observations. With a mass of 0.387 _{ - 0.075 } ^
{+ 0.083 }MJ and radius of 0.808 _{ - 0.033 } ^ {+ 0.034
}RJ, K2-139 b is one of the transiting warm Jupiters with the
lowest mass known to date. The planetary mean density of 0.91 _{ - 0.20}
^ { + 0.24 } g cm-3can be explained with a core of ˜50
M⊕. Given the brightness of the host star (V = 11.653
mag), the relatively short transit duration (˜5 h), and the
expected amplitude of the Rossiter-McLaughlin effect (˜25m
s-1), K2-139 is an ideal target to measure the spin-orbit
angle of a planetary system hosting a warm Jupiter.