Axisymmetric General Relativistic Simulations of the Accretion-Induced Collapse of White Dwarfs

Details Axisymmetric General Relativistic Simulations of the Accretion-Induced Collapse of White Dwarfs Axisymmetric General Relativistic Simulations of the Accretion-Induced Collapse of White Dwarfs

2009-10-14

arxiv.org/abs/0910.2703v1

Phys.Rev.D81:044012,2010

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Submitted to PRD, 31 pages, 23 figures

Scientific paper

10.1103/PhysRevD.81.044012

(Abridged.) The accretion-induced collapse (AIC) of a white dwarf (WD) may lead to the formation of a protoneutron star and a collapse-driven supernova explosion. This process represents a path alternative to thermonuclear disruption of accreting white dwarfs in Type Ia supernovae. Neutrino and gravitational-wave (GW) observations may provide crucial information necessary to reveal a potential AIC. Motivated by the need for systematic predictions of the GW signature of AIC, we present results from an extensive set of general-relativistic AIC simulations using a microphysical finite-temperature equation of state and an approximate treatment of deleptonization during collapse. Investigating a set of 114 progenitor models in rotational equilibrium, with a wide range of rotational configurations, temperatures and central densities, we extend previous Newtonian studies and find that the GW signal has a generic shape akin to what is known as a "Type III" signal in the literature. We discuss the detectability of the emitted GWs, showing that the signal-to-noise ratio for current or next-generation interferometer detectors could be high enough to detect such events in our Galaxy. Some of our AIC models form massive quasi-Keplerian accretion disks after bounce. In rapidly differentially rotating models, the disk mass can be as large as ~0.8-Msun. Slowly and/or uniformly rotating models produce much smaller disks. Finally, we find that the postbounce cores of rapidly spinning white dwarfs can reach sufficiently rapid rotation to develop a nonaxisymmetric rotational instability.

Affiliated with

Also associated with

No associations

Rating

Axisymmetric General Relativistic Simulations of the Accretion-Induced Collapse of White Dwarfs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Axisymmetric General Relativistic Simulations of the Accretion-Induced Collapse of White Dwarfs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Axisymmetric General Relativistic Simulations of the Accretion-Induced Collapse of White Dwarfs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-617143