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An XMM-Mewton observation performed in May 2008 has confirmed that the 13seconds pulsations in the X-ray binary HD 49798/RX J0648.0-4418 are due to arapidly rotating white dwarf. From the pulse time delays induced by the 1.55days orbital motion, and the system's inclination, constrained by the durationof the X-ray eclipse discovered in this observation, we could derive a mass of1.28+/-0.05 M_sun for the white dwarf. The future evolution of this post commonenvelope binary system will likely involve a new phase of mass accretionthrough Roche-lobe overflow that could drive the already massive white dwarfabove the Chandrasekhar limit and produce a Type Ia supernova.

The discovery of a massive white dwarf in the peculiar binary system HD 49798/RX J0648.0-4418