The Symbiotic Channel to Accretion-Induced Collapse of White Dwarfs and Type 1a Supernovae.

Details The Symbiotic Channel to Accretion-Induced Collapse of White Dwarfs and Type 1a Supernovae. The Symbiotic Channel to Accretion-Induced Collapse of White Dwarfs and Type 1a Supernovae.

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21538502h&link_type=abstract

American Astronomical Society, AAS Meeting #215, #385.02; Bulletin of the American Astronomical Society, Vol. 42, p.600

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Scientific paper

We present a study of the efficacy of generation of Type 1a supernovae and of accretion-induced collapse (AIC) of white dwarfs from binaries that evolve through a symbiotic-star phase. The symbiotic binaries, comprised of a red giant and a white dwarf, undergo stable mass transfer via either winds or Roche-lobe overflow and nuclear burning of accreted matter on the surface of the white dwarf. Populations of binaries are generated according to a standard prescription, and their orbits are evolved. Orbital evolutions assume a modified Reimer's wind law and a variety of parametrizations of the process of angular-momentum loss and of nuclear burning on the white dwarfs.
In general, we find that the rate of production of AICs in these systems is not very sensitive to the input parameters, with a significant number generated per million solar masses in binaries, regardless of input parameters. On the other hand, we find the efficacy of Type 1a supernova generation to be a strong function of the assumed parameter values. Also, we find that the number of double-degenerate systems produced via the symbiotic channel is a fairly insensitive function of input parameters.
Implications of these findings for the populations of supersoft sources, ultraluminous X-ray sources, and neutron stars in globular clusters are discussed.

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