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We report the detection of a  0.6  M  J   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   R  p = 1.22  R  J   and   M  p = 0.58  M  J   around a slightly metal‐poor solar‐type host star,  [Fe/H]=− 0.05 ± 0.10 , of   R  * = 0.92  R ⊙   and   M  * = 1.00  M ⊙  . WASP‐25b is found to have a density of  ρ p = 0.32 ρ J  , 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.

WASP‐25b: a 0.6 M J planet in the Southern hemisphere