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

@article{Barragan2018K2139BA,
  title={K2-139 b: A low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star},
  author={Oscar Barrag'an and Davide Gandolfi and A M S Smith and Hans J. Deeg and Malcolm Fridlund and Carina M. Persson and Paolo Donati and Michael Endl and Sz. Csizmadia and Sascha Grziwa and David Nespral and A. P. Hatzes and William D. Cochran and Luca Fossati and Stefan S. Brems and Juan Cabrera and Felice Cusano and Philipp Eigmuller and Carlos Eiroa and Anders Erikson and E. W. Guenther and J. Korth and Diego Lorenzo-Oliveira and Luigi Mancini and Martin Patzold and Jorge Prieto-arranz and Heike Rauer and Isabel Rebollido and Joonas Saario and O. V. Zakhozhay},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2018},
  volume={475},
  pages={1765-1776}
}
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) K0V 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… 

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