WASP-80b : a gas giant transiting a cool dwarf
- Triaud, A.H.M.J.
- Anderson, D.R.
- Collier Cameron, A.
- Doyle, A.P.
- Fumel, A.
- Gillon, M.
- Hellier, C.
- Jehin, E.
- Lendl, M.
- Lovis, C.
- Maxted, P.F.L.
- Pepe, F.
- Pollacco, D.
- Queloz, D.
- Ségransan, D.
- Smalley, B.
- Smith, A.M.S.
- Udry, S.
- West, R.G.
- Wheatley, P.J.
DOIAbstract
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 ± 0.04 Mjup, 0.95 ± 0.03 Rjup 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 broadenin...
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