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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Journal ArticleDOI
Remnant evolution after a carbon–oxygen white dwarf merger
TL;DR: In this article, a 3D smoothed particle hydrodynamics (SPH) simulation of a 0.9molar + 0.6molar CO white dwarfs merger is presented, where the authors use an elaborate prescription in which artificial viscosity is essentially absent and a much larger number of SPH particles than earlier calculations.
Journal ArticleDOI
Type-Ia supernova rates and the progenitor problem, a review
TL;DR: The identity of the progenitor systems of type-Ia supernovae (SNe Ia) is a major unsolved problem in astrophysics as mentioned in this paper, and the recent progress in measuring SN Ia rates in various environments and redshifts, and their use to reconstruct the SNIa delay-time distribution (DTD) -the SN rate versus time that would follow a hypothetical brief burst of star formation.
Journal ArticleDOI
Galactic distribution of merging neutron stars and black holes – prospects for short gamma-ray burst progenitors and LIGO/VIRGO
R. Voss,Thomas M. Tauris +1 more
TL;DR: In this paper, a detailed population synthesis on a large number (2 x 10 7 ) of binary systems in order to investigate the properties of massive double degenerate binaries was performed, including refined treatment of the binding energy in a common envelope, helium star evolution and reduced kicks imparted to new-born black holes.
Journal ArticleDOI
The progenitors of compact-object binaries: impact of metallicity, common envelope and natal kicks
TL;DR: In this paper, the progenitors of double compact object binaries with their population-synthesis code MOBSE are investigated, and the impact of progenitor's metallicity, of the common-envelope parameter $\alpha{}$ and of the natal kicks on the properties of DNSs, BHNSs and BHBs are investigated.
Journal ArticleDOI
Possible indirect confirmation of the existence of Pop III massive stars by gravitational wave
TL;DR: In this article, population synthesis simulations for Population III (Pop III) coalescing binary neutron stars (NS-NSs), neutron star - black hole binaries (BH-BHs) which merge within the age of the universe were performed.
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