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We present the results from a search for gravitational-wave transientsassociated with core-collapse supernovae observed optically within 30 Mpcduring the third observing run of Advanced LIGO and Advanced Virgo. Nogravitational wave associated with a core-collapse supernova has beenidentified. We then report the detection efficiency for a variety of possiblegravitational-wave emissions. For neutrino-driven explosions, the distance atwhich we reach 50% detection efficiency is up to 8.9 kpc, while more energeticmagnetorotationally-driven explosions are detectable at larger distances. Thedistance reaches for selected models of the black hole formation, and quantumchromodynamics phase transition are also provided. We then constrain thecore-collapse supernova engine across a wide frequency range from 50 Hz to 2kHz. The upper limits on gravitational-wave energy and luminosity emission areat low frequencies down to $10^{-4}\,M_\odot c^2$ and $5 \times10^{-4}\,M_\odot c^2$/s, respectively. The upper limits on the proto-neutronstar ellipticity are down to 5 at high frequencies. Finally, by combining theresults obtained with the data from the first and second observing runs of LIGOand Virgo, we improve the constraints of the parameter spaces of the extremeemission models. Specifically, the proto-neutron star ellipticities for thelong-lasting bar mode model are down to 1 for long emission (1 s) at highfrequency.

An Optically Targeted Search for Gravitational Waves emitted by  Core-Collapse Supernovae during the Third Observing Run of Advanced LIGO and  Advanced Virgo