| Issue |
A&A
Volume 531, July 2011
|
|
|---|---|---|
| Article Number | A60 | |
| Number of page(s) | 6 | |
| Section | Planets and planetary systems | |
| DOI | https://doi.org/10.1051/0004-6361/201016208 | |
| Published online | 13 June 2011 | |
WASP-31b: a low-density planet transiting a metal-poor, late-F-type dwarf star⋆,⋆⋆
1
Astrophysics Group, Keele University,
Staffordshire,
ST5 5BG,
UK
e-mail: dra@astro.keele.ac.uk
2
SUPA, School of Physics and Astronomy, University of St. Andrews,
North Haugh,
Fife
KY16 9SS,
UK
3
Observatoire de Genève, Université de Genève,
51 Chemin des
Maillettes, 1290
Sauverny,
Switzerland
4
Las Cumbres Observatory, 6740 Cortona Dr. Suite 102, Santa Barbara, CA
93117,
USA
5
Department of Physics and Astronomy, University of
Leicester, Leicester
LE1 7RH,
UK
6 Institut d’Astrophysique et de Géophysique, Université de
Liège, Allée du 6 Août 17, Bat. B5C, Liège 1, Belgium
7
Astrophysics Research Centre, School of Mathematics &
Physics, Queen’s University, University Road, Belfast
BT7 1NN,
UK
Received: 25 November 2010
Accepted: 18 May 2011
We report the discovery of the low-density, transiting giant planet WASP-31b. The planet is 0.48 Jupiter masses and 1.55 Jupiter radii. It is in a 3.4-day orbit around a metal-poor, late-F-type, V = 11.7 dwarf star, which is a member of a common proper motion pair. In terms of its low density, WASP-31b is second only to WASP-17b, which is a more highly irradiated planet of similar mass.
Key words: binaries: eclipsing / planetary systems / stars: individual: WASP-31
Based in part on observations made with the HARPS spectrograph on the 3.6-m ESO telescope (proposal 085.C-0393) and with the CORALIE spectrograph and the Euler camera on the 1.2-m Euler Swiss telescope, both at the ESO La Silla Observatory, Chile.
The photometric time-series and radial-velocity data used in this work are available 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/531/A60
© ESO, 2011
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