K2-139 b: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star
- Barrag\ue1n, O.
- Gandolfi, D.
- Smith, A. M. S.
- Deeg, H. J.
- Fridlund, Malcolm
- Persson, Carina
- Donati, P.
- Endl, M.
- Csizmadia, Sz.
- Grziwa, S.
- Nespral, D.
- Hatzes, Artie P.
- Cochran, W. D.
- Fossati, L.
- Brems, S. S.
- Cabrera, J.
- Cusano, F.
- Eigm\ufcller, Ph.
- Eiroa, C.
- Erikson, A.
- Guenther, E. W.
- Korth, J.
- Lorenzo-Oliveira, D.
- Mancini, L.
- P\ue4tzold, M.
- Prieto-Arranz, J.
- Rauer, H.
- Rebollido, I.
- Saario, J.
- Zakhozhay, O. V.
DOIAbstract
We announce the discovery of K2-139 b (EPIC 218916923 b), a transiting warm-Jupiter (Teq = 547 \ub1 25 K) on a 29-d orbit around an active (log R\u27_HK = -4.46 \ub1 0.06) K0V star in K2 Campaign 7. We derive the system\u27s parameters by combining the K2 photometry with ground-based follow-up observations. With a mass of 0.387_-0.075^+0.083 M_J and radius of 0.808_-0.033^+0.034 R_J, 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^3 can 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), K2-139 is an...
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