WASP-167b/KELT-13b: joint discovery of a hot Jupiter transiting a rapidly rotating F1V star

We report the joint WASP/KELT discovery of WASP-167b/KELT-13b, a transiting
\nhot Jupiter with a 2.02-d orbit around a V = 10.5, F1V star with [Fe/H] = 0.1
\n± 0.1. The 1.5 RJup planet was confirmed by Doppler tomography of
\nthe 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
\nspin-orbit angle of λ = −165° ± 5° This is in
\nagreement with the known tendency for orbits around hotter stars to be more
\nlikely to be misaligned. WASP-167/KELT-13 is one of the few systems where the
\nstellar rotation period is less than the planetary orbital period. We find
\nevidence of non-radial stellar pulsations in the host star, making it a
\nδ-Scuti or γ-Dor variable. The similarity to WASP-33, a
\npreviously known hot-Jupiter host with pulsations, adds to the suggestion that
\nclose-in planets might be able to excite stellar pulsations.