With student Naveh Levanon and Enrique Garcia-Berro (Universitat Politecnica de Catalunya) we followed the mass blown during the WD-WD merger process in the Double-Degenerate (DD) scenario for type Ia supernovae (SN Ia), and find that the interaction of the SN ejecta with this wind affects the early (<1 day) light curve in a way that may contradict observations, if the detonation occurs during or shortly after the merger (<1 day).
Paper is posted on astro-ph.