Stochastic Nature of Gravitational Waves from Supernova Explosions with Standing Accretion Shock Instability

Details Stochastic Nature of Gravitational Waves from Supernova Explosions with Standing Accretion Shock Instability Stochastic Nature of Gravitational Waves from Supernova Explosions with Standing Accretion Shock Instability

2009-04-28

arxiv.org/abs/0904.4300v1

Astrophys.J.697:L133-L136,2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages, 3 figures, accepted by ApJL

Scientific paper

10.1088/0004-637X/697/2/L133

We study properties of gravitational waves based on the three-dimensional simulations, which demonstrate the neutrino-driven explosions aided by the standing accretion shock instability (SASI). Pushed by evidence supporting slow rotation prior to core-collapse, we focus on the asphericities in neutrino emissions and matter motions outside the protoneutron star. By performing a ray-tracing calculation in 3D, we estimate accurately the gravitational waveforms from anisotropic neutrino emissions. In contrast to the previous work assuming axisymmetry, we find that the gravitational waveforms vary much more stochastically because the explosion anisotropies depend sensitively on the growth of the SASI which develops chaotically in all directions. Our results show that the gravitational-wave spectrum has its peak near $\sim 100$ Hz, reflecting the SASI-induced matter overturns of $\sim O(10)$ ms. We point out that the detection of such signals, possibly visible to the LIGO-class detectors for a Galactic supernova, could be an important probe into the long-veiled explosion mechanism.

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