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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.

Authors

A. H. M. J. Triaud

D. R. Anderson

A. Collier Cameron

A. P. Doyle

A. Fumel

M. Gillon

E. Jehin

M. Lendl

C. Lovis

F. Pepe

D. Pollacco

D. Queloz

D. Ségransan

A. M. S. Smith

S. Udry

R. G. West

P. J. Wheatley



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