K2-31B, a Grazing Transiting Hot Jupiter on a 1.26-day Orbit around a Bright G7V Star
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}\star =0.91 M ⊙, {R}\star =0.78 R ⊙). The planetary radius is poorly constrained (0.7 < R p < 1.4 R Jup),15 owing to the grazing transit and the low sampling rate of the K2 photometry.16
- Publication:
-
The Astronomical Journal
- Pub Date:
- November 2016
- DOI:
- 10.3847/0004-6256/152/5/132
- arXiv:
- arXiv:1510.09149
- Bibcode:
- 2016AJ....152..132G
- Keywords:
-
- planets and satellites: detection;
- planets and satellites: individual: EPIC;
- 204129699;
- b;
- stars: fundamental parameters;
- Astrophysics - Earth and Planetary Astrophysics
- E-Print:
- The Astronomical Journal 152 (2016), 132G