Turn-off of nuclear burning and recovery of accretion in recent galactic novae

Detection of Xrays from classical novae in their postoutburst stages providesunique and crucial information about the explosion mechanism and thereestablishment of accretion. Soft Xrays reveal if a hot nuclear burning shellremains, whereas harder Xrays give diagnostics about the recovery of accretionand the magnetic or non magnetic character of the reborn cataclysmic variable.The unprecedented sensitivity of XMMNewton will permit to deduce crucialparameters of the nova evolution: mass of the white dwarf, turnoff timescale,mass burned to helium, if burning is still on, and properties of the ejectaand/or the recovered accretion stream. We propose to observe 3 novae thatexploded in 2006, to increase the still scarce data on recent novae. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]