WASP-40b: Independent Discovery of the 0.6 M$_Jup$ Transiting Exoplanet HAT-P-27b

Research output: Contribution to journalArticlepeer-review


  • D.~R. Anderson
  • S.~C.~C. Barros
  • I. Boisse
  • F. Bouchy
  • A. Collier Cameron
  • F. Faedi
  • G. Hebrard
  • C. Hellier
  • M. Lendl
  • C. Moutou
  • D. Pollacco
  • A. Santerne
  • B. Smalley
  • A.~M.~S. Smith
  • I. Todd
  • R.~G. West
  • P.~J. Wheatley
  • J. Bento
  • B. Enoch
  • M. Gillon
  • P.~F.~L. Maxted
  • J. McCormac
  • D. Queloz
  • E.~K. Simpson
  • I. Skillen

Colleges, School and Institutes


From WASP photometry and SOPHIE radial velocities we report the discovery of WASP-40b (HAT-P-27b), a 0.6 M$_Jup$ planet that transits its 12th magnitude host star every 3.04 days. The host star is of late G-type or early K-type and likely has a metallicity greater than solar ([Fe/H] = 0.14 plusmn 0.11). The planetrsquos mass and radius are typical of the known hot Jupiters, thus adding another system to the apparent pileup of transiting planets with periods near 3-4 days. Our parameters match those of the recent HATnet announcement of the same planet, thus giving confidence in the techniques used. We report a possible indication of stellar activity in the host star.


Original languageEnglish
Pages (from-to)555
Number of pages1
JournalPublications of the Astronomical Society of the Pacific
Publication statusPublished - 1 May 2011