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

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arxiv 1303.0254 v1 pith:FQOPSXRE submitted 2013-03-01 astro-ph.EP

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

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

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