WASP-167b/KELT-13b: joint discovery of a hot Jupiter transiting a rapidly rotating F1V star
Queloz, D.; Ségransan, D.; Collier Cameron, A.; Delrez, L.; Collins, K. A.; Gillon, M.; Lendl, M.; Maxted, P. F. L.; Pollacco, D.; Udry, S.; Pepe, F.; Jehin, E.; Bieryla, A.; Latham, D. W.; Smalley, B.; Anderson, D. R.; Hellier, C.; West, R. G.; Oberst, T. E.; Stassun, K. G.; Beatty, T. G.; Joner, M. D.; Stevens, D. J.; Labadie-Bartz, J.; Kielkopf, J. F.; Triaud, A. H. M. J.; Rodriguez, J. E.; Pepper, J.; Zhou, G.; Villanueva, S.; Bayliss, D.; Brown, D. J. A.; Tan, T. G.; Temple, L. Y.; Cargile, P. A.; James, D.; Myers, G.; Gaudi, B. S.; Stockdale, C.; D'Ago, G.; Albrow, M. D.; Lund, M. B.; Kuhn, R. B.; Colón, K. D.; Gregorio, J.; Siverd, R. J.; Curtis, I. A.; Eastman, J.; Malpas, A. L.
United Kingdom, New Zealand, Switzerland, United States, Australia, Italy, Belgium, Portugal, South Africa, Austria
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.