We report the discovery of two transiting hot Jupiters , WASP-65b ( M _ { pl } = 1.55 \pm 0.16 M _ { J } ; R _ { pl } = 1.11 \pm 0.06 R _ { J } ) , and WASP-75b ( M _ { pl } = 1.07 \pm 0.05 M _ { J } ; R _ { pl } = 1.27 \pm 0.05 R _ { J } ) .
They orbit their host star every \sim 2.311 , and \sim 2.484 days , respectively .
The planet host WASP-65 is a G6 star ( T _ { eff } = 5600 K , [ Fe/H ] = - 0.07 \pm 0.07 , age \gtrsim 8 Gyr ) ; WASP-75 is an F9 star ( T _ { eff } = 6100 K , [ Fe/H ] = 0.07 \pm 0.09 , age \sim 3 Gyr ) .
WASP-65b is one of the densest known exoplanets in the mass range 0.1 and 2.0 M _ { J } ( \rho _ { pl } = 1.13 \pm 0.08 \rho _ { J } ) , a mass range where a large fraction of planets are found to be inflated with respect to theoretical planet models .
WASP-65b is one of only a handful of planets with masses of \sim 1.5 M _ { J } , a mass regime surprisingly underrepresented among the currently known hot Jupiters .
The radius of WASP-75b is slightly inflated ( \lesssim 10 % ) as compared to theoretical planet models with no core , and has a density similar to that of Saturn ( \rho _ { pl } = 0.52 \pm 0.06 \rho _ { J } ) .