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

[en] 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 M[SUB]jup[/SUB], 0.95 ± 0.03 R[SUB]jup[/SUB] 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[SUB]⋆[/SUB] 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. Using WASP-South photometric observations, from Sutherland (South Africa), confirmed with the 60 cm TRAPPIST robotic telescope, EulerCam, and the CORALIE spectrograph on the Swiss 1.2 m Euler Telescope, and HARPS on the ESO 3.6 m (Prog ID 089.C-0151), all three located at La Silla Observatory, Chile.Radial velocity and photometric data are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr(130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/551/A80

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Triaud, A. H. M. J.; Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland

Anderson, D. R.; Astrophysics Group, Keele University, Staffordshire, ST55, BG, UK

Collier Cameron, A.; SUPA, School of Physics & Astronomy, University of St. Andrews, North Haugh, KY16 9SS, St. Andrews, Fife, Scotland, UK

Doyle, A. P.; Astrophysics Group, Keele University, Staffordshire, ST55, BG, UK

Fumel, Aurélie ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image

Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image

Hellier, C.; Astrophysics Group, Keele University, Staffordshire, ST55, BG, UK

Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image

Lendl, M.; Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland

Lovis, C.; Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland

More authors (10 more)

Language :

English

Title :

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

Publication date :

01 March 2013

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, France

Volume :

551

Pages :

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/2013A%26A...551A..80T
http://de.arxiv.org/abs/1303.0254

Available on ORBi :

since 19 April 2013

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