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We report the discovery of a transiting planet orbiting the star TYC6446-326-1. The star, WASP-22, is a moderately bright (V=12.0) solar-type star(Teff = 6000 +/- 100 K, [Fe/H] = -0.05 +/- 0.08). The lightcurve of the starobtained with the WASP-South instrument shows periodic transit-like featureswith a depth of about 1 and a duration of 0.14 days. The presence of atransit-like feature in the lightcurve is confirmed using z-band photometryobtained with Faulkes Telescope South. High resolution spectroscopy obtainedwith the CORALIE and HARPS spectrographs confirm the presence of a planetarymass companion with an orbital period of 3.533 days in a near-circular orbit.From a combined analysis of the spectroscopic and photometric data assumingthat the star is a typical main-sequence star we estimate that the planet has amass M_p = 0.56 +/- 0.02 M_Jup and a radius R_p = 1.12 +/- 0.04 R_Jup. Inaddition, there is a linear trend of 40 m/s/yr in the radial velocitiesmeasured over 16 months, from which we infer the presence of a third body witha long period orbit in this system. The companion may be a low mass M-dwarf, awhite dwarf or a second planet.

WASP-22 b: A transiting "hot Jupiter" planet in a hierarchical triple system