Papers › K2-139 b: a low-mass warm Jupiter on a 29-day orbit transiting an active K0 V star
K2-139 b: a low-mass warm Jupiter on a 29-day orbit transiting an active K0 V star
O. Barragán, D. Gandolfi, A. M. S. Smith, H. J. Deeg, M. C. V. Fridlund, C. M. Persson, P. Donati, M. Endl, Sz. Csizmadia, S. Grziwa, D. Nespral, A. P. Hatzes, W. D. Cochran, L. Fossati, S. S. Brems, J. Cabrera, F. Cusano, Ph. Eigmüller, C. Eiroa, A. Erikson, E. Guenther, J. Korth, D. Lorenzo-Oliveira, L. Mancini, M. Pätzold, J. Prieto-Arranz, H. Rauer, I. Rebollido, J. Saario, O. V. Zakhozhay
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We announce the discovery of K2-139 b (EPIC 218916923 b), a transiting warm-Jupiter (T_(eq)=547±25 K) on a 29-day orbit around an active (log R^'_(HK) = $-$4.46 $\pm$ 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) 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 hours), and the expected amplitude of the Rossiter-McLaughlin effect (∼25 m s⁻¹ ), K2-139 is an ideal target to measure the spin-orbit angle of a planetary system hosting a warm Jupiter.
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