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

L. Y. Temple; C. Hellier; D. R. Anderson; K. Barkaoui; F. Bouchy; D. J. A. Brown; A. Burdanov; A. Collier Cameron; L. Delrez; E. Ducrot; D. Evans; M. Gillon; E. Jehin; M. Lendl; P. F. L. Maxted; J. McCormac; C. Murray; L. D. Nielsen; F. Pepe; D. Pollacco; D. Queloz; D. Ségransan; B. Smalley; S. Thompson; A. H. M. J. Triaud; O. D. Turner; S. Udry; R. G. West; B. Zouhair

doi:10.1093/mnras/stz2632

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arXiv · 1903.08002

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

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Abstract

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 $\pm$ 0.1 $M_{\rm Jup}$, 1.24 $\pm$ 0.04 $R_{\rm Jup}$ planet to be in a misaligned, retrograde orbit around an F7 star with $T_{\rm eff}$ = 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$''$ ($\sim$1200 AU) contributes $\sim$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.

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L. Y. Temple, C. Hellier, D. R. Anderson, K. Barkaoui, F. Bouchy, D. J. A. Brown, A. Burdanov, A. Collier Cameron, L. Delrez, E. Ducrot, D. Evans, M. Gillon, E. Jehin, M. Lendl, P. F. L. Maxted, J. McCormac, C. Murray, L. D. Nielsen, F. Pepe, D. Pollacco, D. Queloz, D. Ségransan, B. Smalley, S. Thompson, A. H. M. J. Triaud, O. D. Turner, S. Udry, R. G. West, B. Zouhair. 2019-03-19. WASP-180Ab: Doppler tomography of an hot Jupiter orbiting the primary star in a visual binary. https://doi.org/10.1093/mnras/stz2632

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