WASP-32b : a transiting hot jupiter planet orbiting a lithium-poor, solar-type star

We report the discovery of a transiting planet orbiting the star TYC 2-1155-1. The star, WASP-32, is a moderately bright ( V = 11.3 ) solar-type star ( T eff = 6100 ± 100 K , [ Fe / H ] = - 0.13 ± 0.10 ). The light curve of the star obtained with the WASP-South and WASP-North instruments shows periodic transitlike features with a depth of about 1% and a duration of 0.10 day every 2.72 days. The presence of a transitlike feature in the light curve is confirmed using z -band photometry obtained with Faulkes Telescope North. High-resolution spectroscopy obtained with the Coralie spectrograph confirms the presence of a planetary mass companion. From a combined analysis of the spectroscopic and photometric data, assuming that the star is a typical main-sequence star, we estimate that the planet has a mass M p of 3.60 ± 0.07 M Jup and a radius R p = 1.19 ± 0.06 R Jup . WASP-32 is one of a small group of hot Jupiters with masses greater than 3 M Jup . We find that some stars with hot Jupiter companions and with masses M ⋆ ≈ 1.2 M ⊙ , including WASP-32, are depleted in lithium and that the majority of these stars have lithium abundances similar to field stars