In Search of the Most Distant Supernovae and their Rates

For the past decade type Ia supernovae have been instrumental in measuring the cosmological parameters and in revealing the accelerating nature of the universe's expansion. And yet, we still do not know what kind of stellar system is the progenitor of this type of supernova. In my talk I will present a survey for high redshift supernovae conducted with the Subaru 8.2m telescope in the Subaru Deep Field. Using these supernovae, we measure the rates of type Ia supernovae out to redshift z=2. This type of measurement allows us to place constraints on the nature of the progenitor system.