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

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 broadening.

Citation

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 2013 , ' WASP-80b : a gas giant transiting a cool dwarf ' , Astronomy & Astrophysics , vol. 551 , A80 . https://doi.org/10.1051/0004-6361/201220900

Publication

Astronomy & Astrophysics

Status

Peer reviewed

DOI

https://doi.org/10.1051/0004-6361/201220900

ISSN

0004-6361

Type

Journal article

Rights

Collections

University of St Andrews Research

URI

http://hdl.handle.net/10023/5482

St Andrews Research Repository