WASP-167b/KELT-13b: joint discovery of a hot Jupiter transiting a rapidly rotating F1V star
Abstract
We report the joint WASP/KELT discovery of WASP-167b/KELT-13b, a transiting hot Jupiter with a 2.02-d orbit around a V = 10.5, F1V star with [Fe/H] = 0.1 ± 0.1. The 1.5 RJup planet was confirmed by Doppler tomography of the stellar line profiles during transit. We place a limit of <8 MJup on its mass. The planet is in a retrograde orbit with a sky-projected spin-orbit angle of λ = -165° ± 5°. This is in agreement with the known tendency for orbits around hotter stars to be more likely to be misaligned. WASP-167/KELT-13 is one of the few systems where the stellar rotation period is less than the planetary orbital period. We find evidence of non-radial stellar pulsations in the host star, making it a δ-Scuti or γ-Dor variable. The similarity to WASP-33, a previously known hot-Jupiter host with pulsations, adds to the suggestion that close-in planets might be able to excite stellar pulsations.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- November 2017
- DOI:
- 10.1093/mnras/stx1729
- arXiv:
- arXiv:1704.07771
- Bibcode:
- 2017MNRAS.471.2743T
- Keywords:
-
- techniques: photometric;
- techniques: spectroscopic;
- planets and satellites: individual;
- stars: individual;
- starts: rotation;
- Astrophysics - Earth and Planetary Astrophysics
- E-Print:
- 11 pages, 8 figures, accepted by MNRAS