WASP-31b: a low-density planet transiting a metal-poor, late-F-type dwarf star

D.~R. Anderson, A. Collier Cameron, C. Hellier, M. Lendl, T.~A. Lister, P.~F.~L. Maxted, D. Queloz, B. Smalley, A.~M.~S. Smith, A.~H.~M.~J. Triaud, R.~G. West, D.~J.~A. Brown, M. Gillon, F. Pepe, D. Pollacco, D. Ségransan, R.~A. Street, S. Udry

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33 Citations (Scopus)


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. 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 ( or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/531/A60
Original languageEnglish
Pages (from-to)A60
JournalAstronomy and Astrophysics
Publication statusPublished - 1 Jul 2011


  • binaries: eclipsing, planetary systems, stars: individual: WASP-31


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