Journal ArticleDOI
Double white dwarfs as progenitors of R Coronae Borealis stars and type I supernovae
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TLDR
In this article, the authors explored the role of mass transfer in the evolution of double degenerate systems and found that low-mass helium/helium pairs are unstable to dynamical time-scale mass transfer and probably coalesce to form helium-burning sdO stars.Abstract:
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. Tidal mass transfer in these double degenerate systems is explored. The sequence of double white dwarf divides naturally into three segments. (1) Low-mass helium/helium pairs are unstable to dynamical time-scale mass transfer and probably coalesce to form helium-burning sdO stars. (2) In helium/carbon-oxygen pairs, mass transfer occurs on the time scale for gravitational radiation losses (approx.10/sup -4/ M/sub sun/ yr/sup -1/); the accreted helium is quickly ignited, and the accretor expands to dimensions characteristic of R CrB stars, engulfing its companion star. (3) Carbon-oxygen/carbon-oxygen pairs are again unstable to dynamical time-scale mass transfer and, since their total masses exceed the Chandrasekhar limit, are destined to become supernovae. Inactive lifetimes in these latter systems between creation and interaction can exceed 10/sup 10/ years. Birthrates of R CrB stars and Type I supernovae by evolution of double white dwarfs are in reasonable agreement with observational estimates.read more
Citations
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V1309 SCO - Understanding a merger
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White Dwarf/M Dwarf Binaries as Single Degenerate Progenitors of Type Ia Supernovae
TL;DR: In this paper, the authors explored the effects of self-excited mass loss, polar accretion, and magnetic inhibition of mixing of accretion layers on the white dwarfs in the context of Type Ia supernovae.
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Recycled Pulsars Discovered at High Radio Frequency
TL;DR: In this article, the timing parameters of nine pulsars discovered in a survey of intermediate Galactic latitudes at 1400 MHz with the Parkes radio telescope were presented, including two with relatively massive white dwarf companions.
Journal ArticleDOI
Common envelope: on the mass and the fate of the remnant
TL;DR: In this article, the authors propose a methodology for unambiguously defining the post-CE remnant mass after it has been thermally readjusted, namely, by calling the core boundary the radius in the hydrogen shell corresponding to the local maximum of the sonic velocity.
Journal ArticleDOI
The fraction of type Ia supernovae exploding inside planetary nebulae (SNIPs)
Danny Tsebrenko,Noam Soker +1 more
TL;DR: In this article, the fraction of type Ia supernovae (SNe Ia) exploding inside planetary nebulae (PNe), termed SNIPs, is at least 20%.
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