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

Authors:
  • DAD. R. Anderson
    D. R. Anderson
  • ACA. Collier Cameron
    A. Collier Cameron
  • CHC. Hellier
    C. Hellier
  • MLM. Lendl
    M. Lendl
  • TLT. A. Lister
    T. A. Lister
  • PMP. F. L. Maxted
    P. F. L. Maxted
  • DQD. Queloz
    D. Queloz
  • BSB. Smalley
    B. Smalley
  • ASA. M. S. Smith
    A. M. S. Smith
  • ATA. H. M. J. Triaud
    A. H. M. J. Triaud
  • RWR. G. West
    R. G. West
  • DBD. J. A. Brown
    D. J. A. Brown
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Abstract
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.