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 journalArticle

34 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 ± 0.0000028 d, has a mass Mp = 0.542 ± 0.050 MJ and radius Rp = 1.428 ± 0.077 RJ, and is therefore one of the least dense transiting exoplanets so far discovered (ρp = 0.247 ± 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 Teff = 6300 ± 100 K and [Fe/H] = -0.17 ± 0.11.

Original languageEnglish
Pages (from-to)4834-4836
Number of pages3
JournalAstronomical Journal
Issue number6
Publication statusPublished - 1 Jun 2009
Externally publishedYes



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

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

West, R. G., Anderson, D. R., Gillon, M., Hebb, L., Hellier, C., Maxted, P. F. L., Queloz, D., Smalley, B., Triaud, A. H. M. J., Wilson, D. M., Bentley, S. J., Collier Cameron, A., Enoch, B., Horne, K., Irwin, J., Lister, T. A., Mayor, M., Parley, N., Pepe, F., ... Wheatley, P. J. (2009). The low density transiting exoplanet WASP-15b. Astronomical Journal, 137(6), 4834-4836.