The Gravitational Wave Signature of Core-Collapse Supernovae - AstrophysicsReport as inadecuate

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Abstract: We review the ensemble of anticipated gravitational-wave GW emissionprocesses in stellar core collapse and postbounce core-collapse supernovaevolution. We discuss recent progress in the modeling of these processes andsummarize most recent GW signal estimates. In addition, we present new resultson the GW emission from postbounce convective overturn and protoneutron starg-mode pulsations based on axisymmetric radiation-hydrodynamic calculations.Galactic core-collapse supernovae are very rare events, but within 3-5 Mpc fromEarth, the rate jumps to 1 in ~2 years. Using the set of currently availabletheoretical gravitational waveforms, we compute upper-limit optimalsignal-to-noise ratios based on current and advanced LIGO-GEO600-VIRGO noisecurves for the recent SN 2008bk which exploded at ~3.9 Mpc. While initial LIGOscannot detect GWs emitted by core-collapse events at such a distance, we findthat advanced LIGO-class detectors could put significant upper limits on the GWemission strength for such events. We study the potential occurrence of thevarious GW emission processes in particular supernova explosion scenarios andargue that the GW signatures of neutrino-driven, magneto-rotational, andacoustically-driven core-collapse SNe may be mutually exclusive. We suggestthat even initial LIGOs could distinguish these explosion mechanisms based onthe detection or non-detection of GWs from a galactic core-collapsesupernova.

Author: Christian D. Ott TAPIR, Caltech


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