Constraining the double-degenerate scenario for Type Ia supernovae from merger ejected matter

Naveh Levanon*, Noam Soker, Enrique García-Berro

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

We follow the mass expelled during the WD-WD merger process in a particular case of the double-degenerate (DD) scenario for Type Ia supernovae (SNe Ia), and find that the interaction of the SN ejecta with the resulting wind affects the early (first day) light-curve in a way that may be in conflict with some SN Ia observations, if the detonation occurs shortly after the merger, i.e. (103 s ≲ texp ≲ 1 d). The main source of the expelled mass is a disc-wind, or jets that are launched by the accretion disc around the more massive white dwarf (WD) during the viscous phase of the merger. This disc-originated matter will be shocked and heated by the SN ejecta from an explosion, leading to additional radiation in the early light-curve. This enhanced early radiation could then be interpreted as an explosion originating from a progenitor having an inferred radius of one solar radius or more, in conflict with observations of SN 2011fe.

Original languageEnglish
Pages (from-to)2803-2809
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume447
Issue number3
DOIs
StatePublished - 2015

Keywords

  • Accretion, accretion discs
  • Binaries: close
  • Hydrodynamics
  • Supernovae: general
  • White dwarfs

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