WASP-25b: A 0.6MJ planet in the Southern hemisphere

B. Enoch, A. Collier Cameron, D. R. Anderson, T. A. Lister, C. Hellier, P. F L Maxted, D. Queloz, B. Smalley, A. H M J Triaud, R. G. West, D. J A Brown, M. Gillon, L. Hebb, M. Lendl, N. Parley, F. Pepe, D. Pollacco, D. Segransan, E. Simpson, R. A. StreetS. Udry

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We report the detection of a 0.6MJ extrasolar planet by WASP-South, WASP-25b, transiting its solar-type host star every 3.76 d. A simultaneous analysis of the WASP, FTS and Euler photometry and CORALIE spectroscopy yields a planet of Rp = 1.22RJ and Mp = 0.58MJ around a slightly metal-poor solar-type host star, [Fe/H] = -0.05 ± 0.10, of R* = 0.92R and M* = 1.00M. WASP-25b is found to have a density of ρp = 0.32 ρJ, a low value for a sub-Jupiter mass planet. We investigate the relationship of planetary radius to planetary equilibrium temperature and host star metallicity for transiting exoplanets with a similar mass to WASP-25b, finding that these two parameters explain the radii of most low-mass planets well.

Original languageEnglish
Pages (from-to)1631-1636
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Publication statusPublished - 1 Jan 2011
Externally publishedYes



  • Planetary systems

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Enoch, B., Cameron, A. C., Anderson, D. R., Lister, T. A., Hellier, C., Maxted, P. F. L., Queloz, D., Smalley, B., Triaud, A. H. M. J., West, R. G., Brown, D. J. A., Gillon, M., Hebb, L., Lendl, M., Parley, N., Pepe, F., Pollacco, D., Segransan, D., Simpson, E., ... Udry, S. (2011). WASP-25b: A 0.6MJ planet in the Southern hemisphere. Monthly Notices of the Royal Astronomical Society, 410(3), 1631-1636. https://doi.org/10.1111/j.1365-2966.2010.17550.x