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Upcoming LIGO/Virgo/KAGRA (LVK) observing runs are expected to detect avariety of inspiralling gravitational-wave (GW) events, that come fromblack-hole and neutron-star binary mergers. Detection of non-inspiral GWsources is also anticipated. We report the discovery of a new class ofnon-inspiral GW sources - the end states of massive stars - that can producethe brightest simulated stochastic GW burst signal in LVK bands known to date,and could be detectable in the LVK run A+. Some dying massive stars launchbipolar relativistic jets, which inflate a turbulent energetic bubble - cocoon- inside of the star. We simulate such a system using state-of-the-art 3Dgeneral-relativistic magnetohydrodynamic simulations and show that thesecocoons emit quasi-isotropic GW emission in the LVK band, $\sim 10-100$ Hz,over a characteristic jet activity timescale, $\sim 10-100$ s. Ourfirst-principles simulations show that jets exhibit a wobbling behavior, inwhich case cocoon-powered GWs might be detected already in LVK run A+, but itis more likely that these GWs will be detected by the third generation GWdetectors with estimated rate of $ \sim 10 $ events/year. The detection ratedrops to $ \sim 1\% $ of that value if all jets were to feature a traditionalaxisymmetric structure instead of a wobble. Accompanied by electromagneticemission from the energetic core-collapse supernova and the cocoon, we predictthat collapsars are powerful multi-messenger events.

Jetted and Turbulent Stellar Deaths: New LVK-Detectable Gravitational Wave Sources