Discovery of WASP-174b: Doppler tomography of a near-grazing transit
Bouchy, F.; Queloz, D.; Ségransan, D.; Collier Cameron, A.; Delrez, L.; Gillon, M.; Lendl, M.; Maxted, P. F. L.; Pollacco, D.; Udry, S.; Pepe, F.; Jehin, E.; Smalley, B.; Anderson, D. R.; Hellier, C.; Turner, O. D.; West, R. G.; Triaud, A. H. M. J.; Nielsen, L. D.; Brown, D. J. A.; Burdanov, A.; Thompson, S.; Temple, L. Y.; Almleaky, Y.; Hall, R.; Sohy, S.
United Kingdom, Saudi Arabia, Switzerland, Belgium, Austria
Abstract
We report the discovery and tomographic detection of WASP-174b, a planet with a near-grazing transit on a 4.23-d orbit around a V= 11.9, F6V star with [Fe/H] = 0.09 ± 0.09. The planet is in a moderately misaligned orbit with a sky-projected spin-orbit angle of λ = 31° ± 1°. This is in agreement with the known tendency for orbits around hotter stars to be misaligned. Owing to the grazing transit, the planet's radius is uncertain with a possible range of 0.8-1.8 RJup. The planet's mass has an upper limit of 1.3 MJup. WASP-174 is the faintest hot-Jupiter system so far confirmed by tomographic means.