Double CO WD systems from the WD+He subgiant channel and type Ia supernovae

Double CO WD systems from the WD+He subgiant channel and type Ia supernovae

Blog Article

Recent studies suggested that at least some of the observed SNe Ia originate from the double-degenerate model, which involves the merging of double carbon-oxygen white dwarfs (CO WDs).However, seal cookie cutter the delay time distributions predicted by previous theoretical studies are inconsistent with the observed SNe Ia at the early epoches of 8 Gyr.Previous studies suggested that the CO WD+He subgiant channel has a significant contribution to the formation of massive double CO WDs, the merging ofwhich may produce SNe Ia.

In the presentwork, we added this channel into the double-degenerate model to investigate its influence on the delay time distributions of SNe Ia.We found that the delay time distributions would match better with 22 k light ride the observed SNe Ia when the CO WD+He subgiant channel is included in the double-degenerate model.