We report the discovery and characterisation of WASP-180Ab, a hot Jupiter confirmed by the detection of its Doppler shadow and by measuring its mass using radial velocities. We find the 0.9 ± 0.1 MJup, 1.24 ± 0.04 RJup planet to be in a misaligned, retrograde orbit around an F7 star with Teff = 6500K and a moderate rotation speed of vsini = 19.9 km s−1. The host star is the primary of a V = 10.7 binary, where a secondary separated by 5′′ (∼1200 AU) contributes ∼30% of the light. WASP-180Ab therefore adds to a small sample of transiting hot Jupiters known in binary systems. A 4.6-day modulation seen in the WASP data is likely to be the rotational modulation of the companion star, WASP-180B.
@article{arxiv.1903.08002,
title = {WASP-180Ab: Doppler tomography of an hot Jupiter orbiting the primary star in a visual binary},
author = {L. Y. Temple and C. Hellier and D. R. Anderson and K. Barkaoui and F. Bouchy and D. J. A. Brown and A. Burdanov and A. Collier Cameron and L. Delrez and E. Ducrot and D. Evans and M. Gillon and E. Jehin and M. Lendl and P. F. L. Maxted and J. McCormac and C. Murray and L. D. Nielsen and F. Pepe and D. Pollacco and D. Queloz and D. Ségransan and B. Smalley and S. Thompson and A. H. M. J. Triaud and O. D. Turner and S. Udry and R. G. West and B. Zouhair},
journal= {arXiv preprint arXiv:1903.08002},
year = {2019}
}