How the merger of two white dwarfs depends on their mass ratio: orbital stability and detonations at contact

@article{Dan2012HowTM,
  title={How the merger of two white dwarfs depends on their mass ratio: orbital stability and detonations at contact},
  author={M. Dan and S. Rosswog and J. Guillochon and Enrico Ramirez-Ruiz Jacobs University Bremen and U. Cruz},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2012},
  volume={422},
  pages={2417-2428}
}
Despite their unique astrophysical relevance, the outcome of white dwarf binary mergers has so far only been studied for a very restricted number of systems. Here we present the results of a survey with more than 200 simulations systematically scanning the white dwarf binary parameter space. We consider white dwarf masses ranging from 0.2 to 1.2 M⊙ and account for their different chemical compositions. We find excellent agreement with the orbital evolution predicted by mass transfer stability… Expand
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References

SHOWING 1-10 OF 87 REFERENCES
The Stability of Double White Dwarf Binaries Undergoing Direct-Impact Accretion
We present numerical simulations of dynamically unstable mass transfer in a double white dwarf binary with initial mass ratio q = 0.4. The binary components are approximated as polytropes of index nExpand
Evolution of Close White Dwarf Binaries
We describe the evolution of double degenerate binary systems, consisting of components obeying the zero-temperature mass-radius relationship for white dwarf stars, from the onset of mass transfer toExpand
Population synthesis for double white dwarfs. I. Close detached systems.
We model the population of double white dwarfs in the Galaxy and find a better agreement with observations compared to earlier studies, due to two modifications. The first is the treatment of theExpand
Helium accreting CO white dwarfs with rotation: Helium novae instead of double detonation
We present evolutionary models of helium-accreting carbon-oxygen white dwarfs in which we include the effects of the spin-up of the accreting star induced by angular momentum accretion, rotationallyExpand
REMNANTS OF BINARY WHITE DWARF MERGERS
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 betweenExpand
Mass transfer between double white dwarfs
Three periodically variable stars have recently been discovered (V407 Vul, P=9.5 min; ES Cet, P=10.3 min; RX J0806.3+1527, P=5.3 min) with properties that suggest that their photometric periods areExpand
Double white dwarfs as progenitors of R Coronae Borealis stars and type I supernovae
Close double white dwarfs should arise from the second phase of mass exchagne in close binaries which first encountered mass exchange while the more massive star was crossing the Hertzprung gap.Expand
PRELUDE TO A DOUBLE DEGENERATE MERGER: THE ONSET OF MASS TRANSFER AND ITS IMPACT ON GRAVITATIONAL WAVES AND SURFACE DETONATIONS
We present the results of a systematic numerical study of the onset of mass transfer in double degenerate binary systems and its impact on the subsequent evolution. All investigated systems belong toExpand
Population synthesis for double white dwarfs. II. Semi-detached systems: AM CVn stars
We study two models for AM CVn stars: white dwarfs accreting (i) from a helium white dwarf companion and (ii) from a helium-star donor. We show that in the first model possibly no accretion diskExpand
Surface Detonations in Double Degenerate Binary Systems Triggered by Accretion Stream Instabilities
We present three-dimensional simulations on a new mechanism for the detonation of a sub-Chandrasekhar CO white dwarf in a dynamically unstable system where the secondary is either a pure He whiteExpand
...
1
2
3
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5
...