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An observational constraint on the contribution of double degenerates to TypeIa supernovae requires multiple radial velocity measurements of ideallythousands of white dwarfs. This is because only a small fraction of the doubledegenerate population is massive enough, with orbital periods short enough, tobe considered viable Type Ia progenitors. We show how the radial velocityinformation available from public surveys such as the Sloan Digital Sky Surveycan be used to pre-select targets for variability, leading to a ten-foldreduction in observing time required compared to an unranked or random survey.We carry out Monte Carlo simulations to quantify the detection probability ofvarious types of binaries in the survey and show that this method, even in themost pessimistic case, doubles the survey size of the largest survey to date(the SPY survey) in less than 15 per cent of the required observing time. Ourinitial follow-up observations corroborate the method, yielding 15 binaries sofar (eight known and seven new), as well as orbital periods for four of the newbinaries.

Using large spectroscopic surveys to test the double degenerate model for Type Ia supernovae