Three hot-Jupiters on the upper edge of the mass-radius distribution: WASP-177, WASP-181, and WASP-183
Bouchy, F.; Queloz, D.; Ségransan, D.; Collier Cameron, A.; Gillon, M.; Lendl, M.; Maxted, P. F. L.; Pollacco, D.; Udry, S.; Pepe, F.; Jehin, E.; Barkaoui, K.; Benkhaldoun, Z.; Smalley, B.; Anderson, D. R.; Hellier, C.; West, R. G.; Triaud, A. H. M. J.; Nielsen, L. D.; Brown, D. J. A.; Burdanov, A.; Ducrot, E.; Pozuelos, F. J.; Turner, Oliver D.
Switzerland, United Kingdom, Belgium, Morocco, Austria
Abstract
We present the discovery of three transiting planets from the WASP survey, two hot-Jupiters: WASP-177 b (∼0.5 MJup, ∼1.6 RJup) in a 3.07-d orbit of a V = 12.6 K2 star, WASP-183 b (∼0.5 MJup, ∼1.5 RJup) in a 4.11-d orbit of a V = 12.8 G9/K0 star; and one hot-Saturn planet WASP-181 b (∼0.3 MJup, ∼1.2 RJup) in a 4.52-d orbit of a V = 12.9 G2 star. Each planet is close to the upper bound of mass-radius space and has a scaled semimajor axis, a/R*, between 9.6 and 12.1. These lie in the transition between systems that tend to be in orbits that are well aligned with their host-star's spin and those that show a higher dispersion.