56Ni production in double-degenerate white dwarf collisions

Cody Raskin, Evan Scannapieco, Gabriel Rockefeller, Chris Fryer, Steven Diehl, Francis Timmes

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

We present a comprehensive study of white dwarf collisions as an avenue for creating type Ia supernovae. Using a smooth particle hydrodynamics code with a 13-isotope, α-chain nuclear network, we examine the resulting 56Ni yield as a function of total mass, mass ratio, and impact parameter. We show that several combinations of white dwarf masses and impact parameters are able to produce sufficient quantities of56Ni to be observable at cosmological distances. We find that the56Ni production in double-degenerate white dwarf collisions ranges from sub-luminous to the super-luminous, depending on the parameters of the collision. For all mass pairs, collisions with small impact parameters have the highest likelihood of detonating, but56Ni production is insensitive to this parameter in high-mass combinations, which significantly increases their likelihood of detection. We also find that the56Ni dependence on total mass and mass ratio is not linear, with larger-mass primaries producing disproportionately more56Ni than their lower-mass secondary counterparts, and symmetric pairs of masses producing more 56Ni than asymmetric pairs.

Original languageEnglish (US)
Pages (from-to)111-125
Number of pages15
JournalAstrophysical Journal
Volume724
Issue number1
DOIs
StatePublished - Nov 20 2010

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mass ratios
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Keywords

  • Hydrodynamics
  • Nuclear reactions, nucleosynthesis, abundances
  • Supernovae: general
  • White dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

56Ni production in double-degenerate white dwarf collisions. / Raskin, Cody; Scannapieco, Evan; Rockefeller, Gabriel; Fryer, Chris; Diehl, Steven; Timmes, Francis.

In: Astrophysical Journal, Vol. 724, No. 1, 20.11.2010, p. 111-125.

Research output: Contribution to journalArticle

Raskin, Cody ; Scannapieco, Evan ; Rockefeller, Gabriel ; Fryer, Chris ; Diehl, Steven ; Timmes, Francis. / 56Ni production in double-degenerate white dwarf collisions. In: Astrophysical Journal. 2010 ; Vol. 724, No. 1. pp. 111-125.
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