WASP-166b: a bloated super-Neptune transiting a V = 9 star
Bouchy, F.; Queloz, D.; Hellier, Coel; Linder, E.; Ségransan, D.; Collier Cameron, A.; Delrez, L.; Ehrenreich, D.; Gillon, M.; Lendl, M.; Maxted, P. F. L.; Pollacco, D.; Udry, S.; Pepe, F.; Jehin, E.; Smalley, B.; Anderson, D. R.; West, R. G.; Spake, J. J.; Wyttenbach, A.; Triaud, A. H. M. J.; Nielsen, L. D.; Burdanov, A.; Temple, L. Y.
United Kingdom, Switzerland, Belgium, Austria, Netherlands
Abstract
We report the discovery of WASP-166b, a super-Neptune planet with a mass of 0.1 MJup (1.9 MNep) and a bloated radius of 0.63 RJup. It transits a V = 9.36, F9V star in a 5.44-d orbit that is aligned with the stellar rotation axis (sky-projected obliquity angle λ = 3 ± 5 deg). Variations in the radial-velocity measurements are likely the result of magnetic activity over a 12-d stellar rotation period. WASP-166b appears to be a rare object within the `Neptune desert'.