WASP-180Ab: Doppler tomography of a hot Jupiter orbiting the primary star in a visual binary

• Published in: Monthly notices of the Royal Astronomical Society Vol. 490; no. 2; pp. 2467 - 2474
• Main Authors: Temple, L Y, Hellier, C, Anderson, D R, Barkaoui, K, Bouchy, F, Brown, D J A, Burdanov, A, Collier Cameron, A, Delrez, L, Ducrot, E, Evans, D, Gillon, M, Jehin, E, Lendl, M, Maxted, P F L, McCormac, J, Murray, C, Nielsen, L D, Pepe, F, Pollacco, D, Queloz, D, Ségransan, D, Smalley, B, Thompson, S, Triaud, A H M J, Turner, O D, Udry, S, West, R G, Zouhair, B
• Format: Journal Article
• Language: English
• Published: 01-12-2019
• ISSN: 0035-8711; 1365-2966
• DOI: 10.1093/mnras/stz2632

ABSTRACT
We report the discovery and characterization 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  =  6500 K and a moderate rotation speed of vsin i⋆  =  19.9 km s−1. The host star is the primary of a V  =  10.7 binary, where a secondary separated by ∼5 arcsec (∼1200 au) contributes ∼ 30 per cent of the light. WASP-180Ab therefore adds to a small sample of transiting hot Jupiters known in binary systems. A 4.6-d modulation seen in the WASP data is likely to be the rotational modulation of the companion star, WASP-180B.