New Results from the Supernova Ia Progenitor Survey

Napiwotzki, R.; Karl, C.; Nelemans, G.; Yungelson, L.; Christlieb, N.; Drechsel, H.; Heber, U.; Homeier, D.; Koester, D.; Kruk, J.; Leibundgut, B.; Marsh, T.R.; Moehler, S.; Renzini, A.; Reimers, D.

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Author

Napiwotzki, R.

Karl, C.

Nelemans, G.

Yungelson, L.

Christlieb, N.

Drechsel, H.

Heber, U.

Homeier, D.

Koester, D.

Kruk, J.

Leibundgut, B.

Marsh, T.R.

Moehler, S.

Renzini, A.

Reimers, D.

Abstract

We report on a systematic radial velocity survey for double degenerate (DD) binaries as potential progenitors of type Ia supernovae: SPY (ESO Supernovae Ia Progenitor surveY). More than 1000 white dwarfs and pre-white dwarfs were observed with the VLT. Our aim is to perform a statistically significant test of the DD scenario. SPY detected more than 100 new binary white dwarfs, dramatically increasing the number of known DDs. System parameters are determined from ongoing follow-up observations. Our sample includes systems with masses close to the Chandrasekhar limit and a probable SN Ia progenitor candidate.