K2-139 b: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star

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.

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K2-139 b: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star

MPS-Authors

Barragán, O.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gandolfi, D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Smith, A. M. S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Deeg, H. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fridlund, M. C. V.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Persson, C. M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Donati, P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Endl, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Csizmadia, Sz
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Grziwa, S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nespral, D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hatzes, A. P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cochran, W. D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fossati, L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Brems, S. S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cabrera, J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cusano, F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Eigmüller, Ph
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Eiroa, C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Erikson, A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Guenther, E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Korth, J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lorenzo-Oliveira, D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mancini, L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pätzold, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Prieto-Arranz, J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rauer, H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rebollido, I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Saario, J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zakhozhay, O. V.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018MNRAS.475.1765B
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Citation

Barragán, O., Gandolfi, D., Smith, A. M. S., Deeg, H. J., Fridlund, M. C. V., Persson, C. M., et al. (2018). K2-139 b: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star. Monthly Notices of the Royal Astronomical Society, 475, 1765-1776.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CF0C-6

Abstract

We announce the discovery of K2-139 b (EPIC 218916923 b), a transiting warm-Jupiter (T_eq = 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 }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^-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.