Remnants of binary white dwarf mergers

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

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

We carry out a comprehensive smooth particle hydrodynamics simulation survey of double-degenerate white dwarf binary mergers of varying mass combinations in order to establish correspondence between initial conditions and remnant configurations. We find that all but one of our simulation remnants share general properties such as a cold, degenerate core surrounded by a hot disk, while our least massive pair of stars forms only a hot disk. We characterize our remnant configurations by the core mass, the rotational velocity of the core, and the half-mass radius of the disk. We also find that some of our simulations with very massive constituent stars exhibit helium detonations on the surface of the primary star before complete disruption of the secondary. However, these helium detonations are insufficiently energetic to ignite carbon, and so do not lead to prompt carbon detonations.

Original languageEnglish (US)
Article number62
JournalAstrophysical Journal
Volume746
Issue number1
DOIs
StatePublished - Feb 10 2012

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detonation
merger
helium
simulation
stars
general property
carbon
configurations
massive stars
energetics
hydrodynamics
radii

Keywords

  • hydrodynamics
  • nuclear reactions, nucleosynthesis, abundances
  • supernovae: general
  • white dwarfs Online-only material: color figures

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Remnants of binary white dwarf mergers. / Raskin, Cody; Scannapieco, Evan; Fryer, Chris; Rockefeller, Gabriel; Timmes, Francis.

In: Astrophysical Journal, Vol. 746, No. 1, 62, 10.02.2012.

Research output: Contribution to journalArticle

Raskin, Cody ; Scannapieco, Evan ; Fryer, Chris ; Rockefeller, Gabriel ; Timmes, Francis. / Remnants of binary white dwarf mergers. In: Astrophysical Journal. 2012 ; Vol. 746, No. 1.
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