Oxygen-neon-rich merger during common envelope evolution

Pere Canals, Santiago Torres, Noam Soker*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


We conduct a population synthesis study of the common envelope evolution (CEE) of a white dwarf (WD) and an asymptotic giant branch (AGB) star and find that the potential number of type Ia supernovae (SNe Ia) from the core degenerate (CD) and from the double degenerate (DD) scenarios are of the same order of magnitude. For the CD scenario, we consider cases where a carbon-oxygen-rich (CO) AGB core and a CO WD merge during the CEE and leave a WD remnant with a mass of MWD ≥ 1.35M, and for the DD scenario we count surviving CO WD binary systems that merge within a time of 1010 yr. When either the AGB core or the WD are oxygen neon rich (ONe) we assume that the outcome might be a peculiar SN Ia. We find that the number of potential peculiar SNe Ia in the channels we study, which do not include peculiar SNe Ia that involve helium WDs or helium donors, are non-negligible, but less than the number of normal SNe Ia. If an SN Ia or a peculiar SN Ia explosion takes place within about million years after CEE, whether in the CD scenario or in the DD scenario, a massive circumstellar matter is present at explosion time. Our results are compatible with the suggestion that Chandrasekhar-mass SNe Ia mostly come from the CD scenario, and sub-Chandrasekhar SNe Ia mostly come from the DD scenario.

Original languageEnglish
Pages (from-to)4519-4525
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - 2018


  • Binaries: close
  • Stars: AGB and post-AGB
  • Supernovae: general
  • White dwarfs

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