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Paper: Gravitational Wave Signals in Black-hole-forming Core Collapse
Volume: 498, Numerical Modeling of Space Plasma Flows ASTRONUM-2014
Page: 35
Authors: Aloy, M. A.; Cerdá-Durán, P.; Obergaulinger, M.; DeBrye, N.; Font, J. A.
Abstract: We aim to analyze the emission of gravitational waves in the collapsar scenario of long gamma-ray bursts using numerical simulations of collapsing stellar cores. Our general relativistic numerical simulations show that the phase during which the proto-neutron star (PNS) survives before ultimately collapsing to a black hole is particularly optimal for gravitational wave emission. The high-amplitude waves last for a couple of seconds and show a remarkable quasi-periodicity associated with the episodes of convection and the subsequent nonlinear development of the standing-accretion shock instability (SASI). We identify the frequencies associated with the presence of g-modes and with the SASI motions at the PNS surface. The gravitational waves emitted reach large enough amplitudes to be detected with third-generation detectors as the Einstein Telescope within a Virgo cluster volume at rates ≲0.1y-1.
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