We present the fresh XSHOOTER1 phase-resolved spectra of HW Vir. In the light of the recent reports of planets detected in many post common envelope binary systems and in particular in short sdB + dM systems, we have started dedicated monitoring of HW Vir system, a prototype of eclipsing short period sdB + dM binaries where 2 circumbinary planets have been claimed. Aiming to unveil HW Vir as a double lined eclipsing binary and hence determine the absolute masses of both components of this system, we are also investigating the effects of irradiation through the analysis of various irradiated spectral features in order to map the temperature distribution of the irradiated M dwarf.