Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21642701b&link_type=abstract
American Astronomical Society, AAS Meeting #216, #427.01; Bulletin of the American Astronomical Society, Vol. 41, p.840
Astronomy and Astrophysics
Astronomy
Scientific paper
One of the proposed evolutionary channels leading to a type Ia supernova (SN Ia) is through a compact binary system containing a white dwarf and a companion star that could be either a main-sequence star or a low-mass red giant. Mass transfer eventually leads to a Chandrasekhar-mass white dwarf and possible SN Ia. Binary systems leading to a SN Ia are restricted to relatively small mass ratios by the requirement of avoiding high mass transfer rates leading to a common envelope. Systems with higher mass ratios might still maintain stable mass transfer if a strong wind from the white dwarf is able to efficiently strip mass off the companion star. This would significantly expand the occurrence of SNe Ia through this channel, in better accord with observed SNe Ia rates. We use hydrodynamic simulations to investigate the efficiency of this mass stripping in the case of symbiotic binaries. We find the stripping efficiency is several orders of magnitude below the proposed analytic estimate based on the available energy in the wind. Most of this energy leaves the system in the form of thermal energy in the shocked white dwarf wind, leaving little energy available to lift mass off the red giant and out of the system. This result suggests that any evolutionary scenario dependent on mass stripping must be revised.
Blondin John M.
Borkowski Kazimierz J.
Foight Dillon R.
Reynolds Stephen P.
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