Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-02-08
Astrophys.J.658:L51-L54,2007
Astronomy and Astrophysics
Astrophysics
accepted for publication in ApJ Letters
Scientific paper
10.1086/513605
Recent investigations on the delay time of type Ia supernovae have set useful constraints on the progenitors of type Ia supernovae. Here we have calculated the evolution of close binaries consisting of a white dwarf and a main-sequence or subgiant companion. We assume that, once Roche lobe overflow occurs a small fraction of the lost mass from the system forms a circumbinary disk, which extracts the orbital angular momentum from the system through tidal torques. Our calculations indicate that the existence of circumbinary disk can enhance the mass transfer rate and cause secular orbital shrinkage. The white dwarf can grow in mass efficiently to trigger type Ia supernovae even with relatively low-mass ($\la 2 M_{\odot}$) donor stars. Thus this scenario suggest a new possible evolutionary channel to those type Ia supernovae with long delay time $\sim 1-3$ Gyr.
Chen Wen-Cong
Li Xiang-Dong
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