Spectroscopy and differential photometry of HATS-4

HATS-4b has a period of P{approx}2.5167days, mass of M_p_{approx}1.32M_Jup_, radius of R_p_{approx}1.02R_Jup_, and density of {rho}_p_=1.55+/-0.16g/cm3{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+/-0.08.

HATS-4b is among the densest known planets with masses between 1 and 2M_J_ and is thus likely to have a significant content of heavy elements of the order of 75M_{oplus}_. In this paper we present the data reduction, radial velocity measurements, and stellar classification techniques adopted by the HATSouth survey for the CORALIE spectrograph. We also detail a technique for simultaneously estimating vsini and macroturbulence using high resolution spectra.