The number of progenitors in the core-degenerate scenario for Type Ia supernovae

Marjan Ilkov, Noam Soker*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

We calculate the expected number of Type Ia supernovae (SN Ia) in the core-degenerate (CD) scenario and find it to match observations within the uncertainties of the code. In the CD scenario, the super-Chandrasekhar mass white dwarf (WD) is formed at the termination of the common envelope phase from a merger of aWD companion with the hot core of a massive asymptotic giant branch (AGB) star. We use a simple population synthesis code that avoids the large uncertainties involved in estimating the final orbital separation of the common envelope evolution. Instead, we assume that systems where the core of the secondary AGB star is more massive than the WD remnant of the primary star merge at the termination of the common envelope phase. We also use a simple prescription to count systems that have strong interaction during the AGB phase, but not during the earlier red giant branch (RGB) phase. The fact that a very simple population synthesis code that uses the basics of stellar evolution ingredients can match the observed rate of SN Ia might suggest that the CD-scenario plays a major role in forming SN Ia.

Original languageEnglish
Pages (from-to)579-586
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume428
Issue number1
DOIs
StatePublished - Jan 2013
Externally publishedYes

Keywords

  • Binaries
  • Close-stars
  • Evolution-supernovae-white dwarfs

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