Journal ArticleDOI
Double white dwarfs as progenitors of R Coronae Borealis stars and type I supernovae
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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 Nature of the “6 Second” and Related X-Ray Pulsars: Evolutionary and Dynamical Considerations
TL;DR: In this paper, van Paradijs et al. proposed that the 6 s pulsars, as well as other possible evolutionary analogs of one of these, namely, 4U 1626-67, are products of common envelope (CE) evolution of high-mass X-ray binaries (HMXBs).
Journal ArticleDOI
Gravitational waves from light cosmic strings: Backgrounds and bursts with large loops
Abstract: The mean spectrum and burst statistics of gravitational waves produced by a cosmological population of cosmic string loops are estimated using analytic approximations, calibrated with earlier simulations. Formulas are derived showing the dependence of observables on the string tension G{mu}, in the regime where newly-formed loops are relatively large, not very much smaller than the horizon. Large loops form earlier, are more abundant, and generate a more intense stochastic background and more frequent bursts than assumed in earlier background estimates, enabling experiments to probe lighter cosmic strings of interest to string theory. Predictions are compared with instrument noise from current and future experiments, and with confusion noise from known astrophysical gravitational-wave sources such as stellar and massive black hole binaries. In these large-loop models, current data from millisecond pulsar timing already suggests that G{mu} is less than about 10{sup -10}, close to the minimum value where bursts might be detected by Advanced LIGO, and a typical value expected in strings from brane inflation. Because of confusion noise expected from massive black hole binaries, pulsar techniques will not be able to go below about G{mu}{approx_equal}10{sup -11}. LISA will be sensitive to stochastic backgrounds created by strings as light as G{mu}{approx_equal}10{sup -15},more » at frequencies where it is limited by confusion noise of Galactic stellar populations; however, for those lightest detectable strings, bursts are rarely detectable. For G{mu}>10{sup -11}, the stochastic background from strings dominates the LISA noise by a large factor, and burst events may also be detectable by LISA, allowing detailed study of loop behavior. Astrophysical confusion might be low enough at 0.1 to 1 Hz to eventually reach G{mu}{approx_equal}10{sup -20} with future interferometer technology.« less
Journal ArticleDOI
Type Ia supernovae inside planetary nebulae: shaping by jets
Danny Tsebrenko,Noam Soker +1 more
TL;DR: In this paper, the authors show that jets launched prior to type Ia supernova (SN Ia) explosion in the core-degenerate scenario can account for the appearance of two opposite lobes ('Ears') along the symmetry axis of the SN remnant (SNR).
Journal ArticleDOI
Fast-rising blue optical transients and AT2018cow following electron-capture collapse of merged white dwarfs
Maxim Lyutikov,Silvia Toonen +1 more
TL;DR: In this article, fast-rising blue optical transients (FBOTs) and the brightest event of the class, AT2018cow, result from an electron-capture collapse to a neutron star following the merger of a massive ONeMg white dwarf with another WD.
Journal ArticleDOI
The Future is Now: the Formation of Single Low Mass White Dwarfs in the Solar Neighborhood
TL;DR: In this paper, it was shown that there is a significant field population (of order half of the detected systems) that arises from old metal-rich stars which truncate their evolution prior to the helium flash from severe mass loss.
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