WASP-120 b, WASP-122 b, AND WASP-123 b : three newly discovered planets from the WASP-South survey

We present the discovery by the WASP-South survey of three planets transiting moderately bright stars (V � 11). WASP-120b is a massive (5.0MJup) planet in a 3.6-day orbit that we find likely to be eccentric (e = 0.059 +0.025 −0.018 ) around an F5 star. WASP-122b is a hot-Jupiter (1.37MJup, 1.79RJup) in a 1.7-day orbit about a G4 star. Our predicted transit depth variation caused by the atmosphere of WASP-122b suggests it is well suited to characterisation. WASP-123b is a hot-Jupiter (0.92MJup, 1.33RJup) in a 3.0-day orbit around an old (� 7 Gyr) G5 star. Subject headings: Planetary systems — stars: individual (WASP-120,WASP-122,WASP-123)