The Low Density Transiting Exoplanet WASP-15b

R.~G. West, D.~R. Anderson, M. Gillon, L. Hebb, C. Hellier, P.~F.~L. Maxted, D. Queloz, B. Smalley, A.~H.~M.~J. Triaud, D.~M. Wilson, S.~J. Bentley, A. Collier Cameron, B. Enoch, K. Horne, J. Irwin, T.~A. Lister, M. Mayor, N. Parley, F. Pepe, D. PollaccoD. Segransan, M. Spano, S. Udry, P.~J. Wheatley

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


We report the discovery of a low-density exoplanet transiting an 11th magnitude star in the Southern hemisphere. WASP-15b, which orbits its host star with a period P = 3.7520656 plusmn 0.0000028 d, has a mass M $_p$ = 0.542 plusmn 0.050 M $_J$ and radius R $_p$ = 1.428 plusmn 0.077 R $_J$, and is therefore one of the least dense transiting exoplanets so far discovered ($$_p$ = 0.247 plusmn 0.035 g cm$^-3$). An analysis of the spectrum of the host star shows it to be of spectral type around F5, with an effective temperature T $_eff$ = 6300 plusmn 100 K and [Fe/H] = -0.17 plusmn 0.11.
Original languageEnglish
Pages (from-to)4834-4836
Number of pages3
JournalThe Astronomical Journal
Publication statusPublished - 1 Jun 2009


  • binaries: eclipsing, planetary systems, stars: individual: WASP-15, techniques: photometric, techniques: radial velocities, techniques: spectroscopic


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