We report the discovery by the HATSouth survey of HATS-4b , an extrasolar planet transiting a V= 13.46 mag G star .
HATS-4b has a period of P \approx 2.5167 d , mass of M _ { p } \approx 1.32 M _ { Jup } , radius of R _ { p } \approx 1.02 R _ { Jup } and density of \rho _ { p } = 1.55 \pm 0.16 g cm ^ { -3 } \approx 1.24 \rho _ { Jup } .
The host star has a mass of 1.00 M _ { \sun } , a radius of 0.92 R _ { \sun } and a very high metallicity [ Fe / H ] = 0.43 \pm 0.08 .
HATS-4b is among the densest known planets with masses between 1–2 M _ { J } and is thus likely to have a significant content of heavy elements of the order of 75 M _ { \earth } .
In this paper we present the data reduction , radial velocity measurement and stellar classification techniques adopted by the HATSouth survey for the CORALIE spectrograph .
We also detail a technique to estimate simultaneously v \sin { i } and macroturbulence using high resolution spectra .