Search for double degenerate progenitors of supernovae type Ia with SPY
  We report on a large survey for double degenerate (DD) binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (SN Ia Progenitor surveY - SPY). About 560 white dwarfs were checked for radial velocity variations until now. Ninety new DDs have been discovered, including short period systems with masses close to the Chandrasekhar mass. 
R. Napiwotzki, N. Christlieb, H. Drechsel, H.-J. Hagen, U. Heber, D.   Homeier, C. Karl, D. Koester, B. Leibundgut, T.R. Mar...