Looking into the cradle of the grave: J22564-5910, a potential young post-merger hot subdwarf
Context. We present the discovery of J22564-5910, a new type of hot subdwarf (sdB) which shows evidence of gas present in thesystem and it has shallow, multi-peaked hydrogen and helium lines which vary in shape over time. All observational evidence pointstowards J22564-5910 being observed very shortly after the merger phase that formed it.Aims. Using high-resolution, high signal-to-noise spectrosc
