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. PollaccoD. Queloz, D. Ségransan, B. Smalley, S. Thompson, A. H. M. J. Triaud, O. D. Turner, S. Udry, R. G. West, B. Zouhair

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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 ± 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″ (∼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.
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Early online date20 Sep 2019
DOIs
Publication statusE-pub ahead of print - 20 Sep 2019

Bibliographical note

8 pages, 6 figures, submitted to MNRAS

Keywords

  • astro-ph.EP
  • techniques: spectroscopic
  • techniques: photometric
  • planetary systems
  • stars: rotation

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