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.

Abstract

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., …Wheatley, P. J. (2013). WASP-80b: a gas giant transiting a cool dwarf. Astronomy & Astrophysics, 551, Article A80. https://doi.org/10.1051/0004-6361/201220900

• Journal Article Type: Article
• Acceptance Date: Jan 9, 2013
• Online Publication Date: Feb 26, 2013
• Publication Date: 2013-03
• Deposit Date: Jun 16, 2023
• Journal: Astronomy & Astrophysics
• Print ISSN: 0004-6361
• Electronic ISSN: 1432-0746
• Publisher: EDP Sciences
• Peer Reviewed: Peer Reviewed
• Volume: 551
• Article Number: A80
• DOI: https://doi.org/10.1051/0004-6361/201220900
• Keywords: Space and Planetary Science; Astronomy and Astrophysics; planetary systems; binaries: eclipsing; stars: individual: WASP-80; techniques: radial velocities; techniques: photometric; techniques: spectroscopic