The gravitational wave burst signal from core collapse of rotating stars

Abstract

We present results from detailed general relativistic simulations of stellar core collapse to a proto-neutron star, using two different microphysical nonzero-temperature nuclear equations of state as well as an approximate description of deleptonization during the collapse phase. Investigating a wide variety of rotation rates and profiles as well as masses of the progenitor stars and both equations of state, we confirm in this very general setup the recent finding that a generic gravitational wave burst signal is associated with core bounce, already known as type I in the literature. The previously suggested type II (or "multiple-bounce") waveform morphology does not occur. Despite this reduction to a single waveform type, we demonstrate that it is still possible to constrain the progenitor and postbounce rotation based on a combination of the maximum signal amplitude and the peak frequency of the emitted gravitational wave burst. Our models include to sufficient accuracy the currently known necessary physics for the collapse and bounce phase of core-collapse supernovae, yielding accurate and reliable gravitational wave signal templates for gravitational wave data analysis. In addition, we assess the possiblity of nonaxisymmetric instabilities in rotating nascent proto-neutron stars. We find strong evidence that in an iron core-collapse event the postbounce core cannot reach sufficiently rapid rotation to become subject to a classical bar-mode instability. However, many of our postbounce core models exhibit sufficiently rapid and differential rotation to become subject to the recently discovered dynamical instability at low rotation rates.

28 pages, 23 figures, minor changes

References in corpus (11)

• The Supernova -- Gamma-Ray Burst Connection
• Theory of Core-Collapse Supernovae
• 3D Collapse of Rotating Stellar Iron Cores in General Relativity including Deleptonization and a Nuclear Equation of State
• Accurate simulations of the dynamical bar-mode instability in full General Relativity
• Generic Gravitational Wave Signals from the Collapse of Rotating Stellar Cores
• Waveless Approximation Theories of Gravity
• Rotating Collapse of Stellar Iron Cores in General Relativity
• Multi-Dimensional Explorations in Supernova Theory
• On the accretion-induced QNM excitation of a Schwarzschild black hole
• AMR simulations of the low T/|W| bar-mode instability of neutron stars
• Non-axisymmetric instability and fragmentation of general relativistic quasi-toroidal stars

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