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
Early UV emission from disc-originated matter (DOM) in Type Ia supernovae in the double-degenerate scenario
Naveh Levanon,Noam Soker +1 more
TL;DR: In this article, it was shown that the blue and UV excess emission at the first few days of some type Ia supernovae (SNe Ia) can be accounted for in the double degenerate (DD) scenario by the collision of the SN ejecta with circumstellar matter that was blown by the accretion disk formed during the merger process of the two white dwarfs (WDs).
Journal ArticleDOI
Swift X-Ray Upper Limits on Type Ia Supernova Environments
TL;DR: In this paper, the authors considered 53 Type Ia supernovae (SNe Ia) observed by the Swift X-Ray Telescope (XRT) and calculated upper limits to the X-ray luminosity (0.2 - 10 keV) and mass-loss rate of L 0.2-10 < 1.7
Journal ArticleDOI
The Uncertain Future of Massive Binaries Obscures the Origin of LIGO/Virgo Sources
TL;DR: In this article , the authors examine the possible future evolution of Melnick 34, the most massive known binary star system, and show that various assumptions regarding stellar and binary physics predict a wide variety of outcomes: from a close BH-BH binary (which would lead to a potentially detectable coalescence), through a wide BHbH binary, or a Thorne-Zytkow object, to a complete disruption of both objects by pair-instability supernovae.
Journal ArticleDOI
The fate of Cyg X-1: an empirical lower limit on BH-NS merger rate
TL;DR: In this article, the authors follow the future evolution of Cyg X-1 and show that it will soon encounter a Roche lobe overflow episode, followed shortly by a Type Ib/c supernova and the formation of a NS.
Journal ArticleDOI
SDSS-II Supernova Survey: an analysis of the largest sample of Type Ia Supernovae and correlations with host-galaxy spectral properties
R. C. Wolf,Chris B. D'Andrea,Ravi R. Gupta,Ravi R. Gupta,Masao Sako,J. A. Fischer,Richard Kessler,Saurabh Jha,M. March,Daniel Scolnic,J. L. Fischer,Heather Campbell,Heather Campbell,Robert C. Nichol,Matthew D. Olmstead,Matthew D. Olmstead,Michael Richmond,Donald P. Schneider,Mathew Smith,Mathew Smith +19 more
TL;DR: In this article, the relationship between properties of Type Ia supernovae and those of their host galaxies, focusing primarily on correlations with Hubble residuals (HR), was studied.
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