We report the discovery of two new transiting extrasolar planets orbiting moderately bright ( V = 10.7 and 12.2 mag ) F stars ( masses of 1.39 M _ { \sun } and 1.10 M _ { \sun } , respectively ) .
The planets have periods of P = 4.7322 d and 4.4087 d , and masses of 0.21 M _ { J } and 0.17 M _ { J } which are almost half-way between those of Neptune and Saturn .
With radii of 1.31 R _ { J } and 1.13 R _ { J } , these very low density planets are the two lowest mass planets with radii in excess that of Jupiter .
Comparing with other recent planet discoveries , we find that sub-Saturns ( 0.18 M _ { J } < M _ { p } < 0.3 M _ { J } ) and super-Neptunes ( 0.05 M _ { J } < M _ { p } \leq 0.18 M _ { J } ) exhibit a wide range of radii , and their radii exhibit a weaker correlation with irradiation than higher mass planets .
The two planets are both suitable for measuring the Rossiter-McLaughlin effect and for atmospheric characterization .
Measuring the former effect would allow an interesting test of the theory that star–planet tidal interactions are responsible for the tendency of close-in giant planets around convective envelope stars to be on low obliquity orbits .
Both planets fall on the edge of the short period Neptunian desert in the semi-major axis–mass plane .