We report three newly discovered exoplanets from the SuperWASP survey .
WASP-127b is a heavily inflated super-Neptune of mass 0.18 \pm 0.02 ~ { } M _ { J } and radius 1.37 \pm 0.04 ~ { } R _ { J } .
This is one of the least massive planets discovered by the WASP project .
It orbits a bright host star ( V _ { mag } = 10.16 ) of spectral type G5 with a period of 4.17 days .
WASP-127b is a low-density planet that has an extended atmosphere with a scale height of 2500 \pm 400 ~ { } km , making it an ideal candidate for transmission spectroscopy .
WASP-136b and WASP-138b are both hot Jupiters with mass and radii of 1.51 \pm 0.08 ~ { } M _ { J } and 1.38 \pm 0.16 ~ { } R _ { J } , and 1.22 \pm 0.08 ~ { } M _ { J } and 1.09 \pm 0.05 ~ { } R _ { J } , respectively .
WASP-136b is in a 5.22 -day orbit around an F9 subgiant star with a mass of 1.41 \pm 0.07 ~ { } M _ { \odot } and a radius of 2.21 \pm 0.22 ~ { } R _ { \odot } .
The discovery of WASP-136b could help constrain the characteristics of the giant planet population around evolved stars .
WASP-138b orbits an F7 star with a period of 3.63 days .
Its radius agrees with theoretical values from standard models , suggesting the presence of a heavy element core with a mass of \sim 10 ~ { } M _ { \oplus } .
The discovery of these new planets helps in exploring the diverse compositional range of short-period planets , and will aid our understanding of the physical characteristics of both gas giants and low-density planets .