ausblenden:
Schlagwörter:
Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,General Relativity and Quantum Cosmology, gr-qc
Zusammenfassung:
We present the results from a search for gravitational-wave transients
associated with core-collapse supernovae observed within a source distance of
approximately 20 Mpc during the first and second observing runs of Advanced
LIGO and Advanced Virgo. No significant gravitational-wave candidate was
detected. We report the detection efficiencies as a function of the distance
for waveforms derived from multidimensional numerical simulations and
phenomenological extreme emission models. For neutrino-driven explosions the
distance at which we reach 50% detection efficiency is approaching 5 kpc, and
for magnetorotationally-driven explosions is up to 54 kpc. However, waveforms
for extreme emission models are detectable up to 28 Mpc. For the first time,
the gravitational-wave data enabled us to exclude part of the parameter spaces
of two extreme emission models with confidence up to 83%, limited by coincident
data coverage. Besides, using ad hoc harmonic signals windowed with Gaussian
envelopes we constrained the gravitational-wave energy emitted during
core-collapse at the levels of $4.27\times 10^{-4}\,M_\odot c^2$ and
$1.28\times 10^{-1}\,M_\odot c^2$ for emissions at 235 Hz and 1304 Hz
respectively. These constraints are two orders of magnitude more stringent than
previously derived in the corresponding analysis using initial LIGO, initial
Virgo and GEO 600 data.
