Grziwa, Sascha; Gandolfi, Davide; Csizmadia, Szilard; Fridlund, Malcolm; Parviainen, Hannu; Deeg, Hans J.; Cabrera, Juan; Djupvik, Amanda A.; Albrecht, Simon; Palle, Enric B.; Pätzold, Martin; Béjar, Victor J. S.; Prieto-Arranz, Jorge; Eigmüller, Philipp; Erikson, Anders; Fynbo, Johan P. U.; Guenther, Eike W.; Hatzes, Artie P.; Kiilerich, Amanda; Korth, Judith; Kuutma, Teet; Montañés-Rodríguez, Pilar; Nespral, David; Nowak, Grzegorz; Rauer, Heike; Saario, Joonas; Sebastian, Daniel; Slumstrup, Ditte
K2-31B, a Grazing Transiting Hot Jupiter on a 1.26-day Orbit around a Bright G7V Star,
The Astronomical Journal, Vol. 152, Issue 5
Abstract
We report the discovery of K2-31b, the first confirmed transiting hot Jupiter detected by the K2 space mission. We combined K2 photometry with FastCam lucky imaging and FIES and HARPS high-resolution spectroscopy to confirm the planetary nature of the transiting object and derived the system parameters. K2-31b is a 1.8-Jupiter-mass planet on a 1.26-day orbit around a G7 V star (M∗ = 0.91 M⊙, R∗ = 0.78 R⊙). The planetary radius is poorly constrained (0.7 < Rp < 1.4 RJup), owing to the grazing transit and the low sampling rate of the K2 photometry.
Key words: planets and satellites: detection / planets and satellites: individual: EPI 204129699, b / stars: fundamental parameters
