WASP-30b: A 61 M $_Jup$ Brown Dwarf Transiting a V = 12, F8 Star

Research output: Contribution to journalArticlepeer-review


  • D.~R. Anderson
  • A. Collier Cameron
  • C. Hellier
  • M. Lendl
  • P.~F.~L. Maxted
  • D. Pollacco
  • D. Queloz
  • B. Smalley
  • A.~M.~S. Smith
  • I. Todd
  • R.~G. West
  • S.~C.~C. Barros
  • B. Enoch
  • M. Gillon
  • T.~A. Lister
  • F. Pepe
  • D. Ségransan
  • R.~A. Street
  • S. Udry

Colleges, School and Institutes


We report the discovery of a 61-Jupiter-mass brown dwarf (BD), which transits its F8V host star, WASP-30, every 4.16 days. From a range of age indicators we estimate the system age to be 1-2 Gyr. We derive a radius (0.89 plusmn 0.02 R $_Jup$) for the companion that is consistent with that predicted (0.914 R $_Jup$) by a model of a 1 Gyr old, non-irradiated BD with a dusty atmosphere. The location of WASP-30b in the minimum of the mass-radius relation is consistent with the quantitative prediction of Chabrier amp Baraffe, thus confirming the theory.


Original languageEnglish
Pages (from-to)L19
JournalAstrophysical Journal Letters
Publication statusPublished - 1 Jan 2011


  • binaries: eclipsing, brown dwarfs, stars: individual: WASP-30