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
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Journal ArticleDOI
The First Science Results from SPHERE: Disproving the Predicted Brown Dwarf around V471 Tau
A. Hardy,Matthias R. Schreiber,Steven G. Parsons,Claudio Caceres,G. Retamales,Zahed Wahhaj,Dimitri Mawet,Hector Canovas,Lucas A. Cieza,Lucas A. Cieza,Tom Marsh,Madelon C. P. Bours,V. S. Dhillon,Amelia Bayo +13 more
TL;DR: In this article, the authors used the extreme-AO instrument SPHERE to image the prototype eclipseing post-common envelope binary V471 Tau in search of the brown dwarf that is believed to be responsible for variations in its eclipse arrival times.
Journal ArticleDOI
The Double-Degenerate Nucleus of the Planetary Nebula TS 01. A Close Binary Evolution Showcase
Gagik Tovmassian,Lev R. Yungelson,Thomas Rauch,Valery F. Suleimanov,Valery F. Suleimanov,Ralf Napiwotzki,Grazyna Stasinska,John A. Tomsick,Jörn Wilms,Christophe Morisset,Miriam Peña,Michael G. Richer +11 more
TL;DR: In this paper, a detailed investigation of SBS1150+599A, a close binary star hosted by the planetary nebula PN G135.9 (TS01, Stasinska et al, 2009), is presented.
Journal ArticleDOI
Blue supergiant progenitor models of type II supernovae
TL;DR: In this paper, it was shown that within all the uncertainties that govern the process of Roche-lobe overflow in case Br-type massive binaries, it cannot be excluded that a significant fraction of them merge and become single stars.
Journal ArticleDOI
Super-Eddington wind scenario for the progenitors of type Ia supernovae: Accreting He-rich matter onto white dwarfs
TL;DR: In this article, the authors studied the accretion of He-rich matter onto CO WDs and explored a scenario in which a strong wind forms on the surface of the WD if the total luminosity exceeds the Eddington limit.
Journal ArticleDOI
Modeling and simulation of turbulent nuclear flames in Type Ia supernovae
TL;DR: A review of the state of the art in physical modeling and computational simulations of turbulent flames as pertaining to Type Ia supernovae is given in this article, along with various assumptions made for their simplifications; and the numerical means of their discretizations.
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