WASP-80b: a gas giant transiting a cool dwarf

A.~H.~M.~J. Triaud, D.~R. Anderson, A. Collier Cameron, A.~P. Doyle, A. Fumel, M. Gillon, C. Hellier, E. Jehin, M. Lendl, C. Lovis, P.~F.~L. Maxted, F. Pepe, D. Pollacco, D. Queloz, D. Ségransan, B. Smalley, A.~M.~S. Smith, S. Udry, R.~G. West, P.~J. Wheatley

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46 Citations (Scopus)


We report the discovery of a planet transiting the star WASP-80 (1SWASP J201240.26-020838.2; 2MASS J20124017-0208391; TYC 5165-481-1; BPM 80815; V = 11.9, K = 8.4). Our analysis shows this is a 0.55 plusmn 0.04 M$_jup$, 0.95 plusmn 0.03 R$_jup$ gas giant on a circular 3.07 day orbit around a star with a spectral type between K7V and M0V. This system produces one of the largest transit depths so far reported, making it a worthwhile target for transmission spectroscopy. We find a large discrepancy between the vsini$_⋆$ inferred from stellar line broadening and the observed amplitude of the Rossiter-McLaughlin effect. This can be understood either by an orbital plane nearly perpendicular to the stellar spin or by an additional, unaccounted for source of broadening. Using WASP-South photometric observations, from Sutherland (South Africa), confirmed with the 60 cm TRAPPIST robotic telescope, EulerCam, and the CORALIE spectrograph on the Swiss 1.2 m Euler Telescope, and HARPS on the ESO 3.6 m (Prog ID 089.C-0151), all three located at La Silla Observatory, Chile.Radial velocity and photometric data are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr( or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/551/A80
Original languageEnglish
Pages (from-to)A80
JournalAstronomy and Astrophysics
Publication statusPublished - 1 Mar 2013


  • planetary systems, binaries: eclipsing, stars: individual: WASP-80, techniques: radial velocities, techniques: photometric, techniques: spectroscopic


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