Gravitational Waves from Stellar Collapse: Correlations to Explosion Asymmetries

Details Gravitational Waves from Stellar Collapse: Correlations to Explosion Asymmetries Gravitational Waves from Stellar Collapse: Correlations to Explosion Asymmetries

2004-03-08

arxiv.org/abs/astro-ph/0403188v1

Astrophys.J.609:288-300,2004

Astronomy and Astrophysics

Astrophysics

36 pages including 14 figures, accepted by ApJ

Scientific paper

10.1086/421040

The collapse of massive stars not only produces observable outbursts across the entire electromagnetic spectrum but, for Galactic (or near-Galactic) supernovae, detectable signals for ground-based neutrino and gravitational wave detectors. Gravitational waves and neutrinos provide the only means to study the actual engine behind the optical outbursts: the collapsed stellar core. While the neutrinos are most sensitive to details of the equation of state, gravitational waves provide a means to study the mass asymmetries in this central core. We present gravitational wave signals from a series of 3-dimensional core-collapse simulations with asymmetries derived from initial perturbations caused by pre-collapse convection, core rotation, and low-mode convection in the explosion engine itself. A Galactic supernovae will allow us to differentiate these different sources of asymmetry. Combining this signal with other observations of the supernova, from neutrinos to gamma-rays to the compact remnant, dramatically increases the predictive power of the gravitational wave signal. We conclude with a discussion of the gravitational wave signal arising from collapsars, the leading engine for long-duration gamma-ray bursts.

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