A mixed helium-oxygen shell in some core-collapse supernova progenitors

Roni Anna Gofman, Avishai Gilkis, Noam Soker

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We evolve models of rotating massive stars up to the stage of iron core collapse using the MESA code and find a shell with a mixed composition of primarily helium and oxygen in some cases. In the parameter space of initialmasses of 13-40M and initial rotation velocities of 0- 450 km s-1 that we investigate, we find amixed helium-oxygen (He-O) shell with a significant total He-O mass and with a helium to oxygen mass ratio in the range of 0.5-2 only for a small fraction of the models. While the shell formation due to mixing is instigated by rotation, the precollapse rotation rate is not very high. The fraction ofmodels with a shell of He-O composition required for an energetic collapse-induced thermonuclear explosion is small, as is the fraction of modelswith high specific angular momentum,which can aid the thermonuclear explosion by retarding the collapse. Our results suggest that the collapse-induced thermonuclear explosion mechanism that was revisited recently can account for at most a small fraction of core-collapse supernovae. The presence of such a mixed He-O shell still might have some implications for core-collapse supernovae, such as some nucleosynthesis processes when jets are present, or might result in peculiar sub-luminous core-collapse supernovae.

Original languageEnglish
Pages (from-to)703-710
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume478
Issue number1
DOIs
StatePublished - 21 Jul 2018

Keywords

  • Stars: Massive
  • Stars: Rotation
  • Supernovae: General

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