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.
|Number of pages||3|
|Journal||The Astronomical Journal|
|Publication status||Published - 1 Jun 2009|
- binaries: eclipsing, planetary systems, stars: individual: WASP-15, techniques: photometric, techniques: radial velocities, techniques: spectroscopic