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HD49798/RXJ0648.0-4418 is the only known X-ray binary composed of a hotsubdwarf and a massive white dwarf (M=1.28+/-0.05 Msun). This system, with anorbital period of 1.55 days, is the outcome of a common envelope evolution,most likely of a pair of stars with initial masses of about 8-10 Msun. When thehot subdwarf, currently in a He-burning phase, will expand again and fill itsRoche-lobe, the enhanced mass transfer can rapidly bring the already massivewhite dwarf above the Chandrasekhar limit. The possible final fate, either aType Ia supernova explosion or an accretion induced collapse, is particularlyinteresting in view of the high rotational velocity of this star, which has theshortest spin period (13 s) observed in a white dwarf.

The progenitor of a type Ia supernova with a short delay time?