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Multi-messenger Cocoons: New LIGO/Virgo/KAGRA-Detectable Gravitational Wave Sources

Presentation #402.05 in the session Multi-messenger Stripped Envelope Supernovae.

Published onJul 01, 2023
Multi-messenger Cocoons: New LIGO/Virgo/KAGRA-Detectable Gravitational Wave Sources

Upcoming LIGO/Virgo/KAGRA (LVK) observing runs promise to detect a variety of inspiralling gravitational wave (GW) sources. With powerful phenomena such as gamma-ray burst jets and supernovae unable to produce detectable GW signals in LVK, all non-inspiral GW sources remain firmly out of reach for the next decade. Using the first simulations that follow jets from a newly formed black hole in a collapsing star to outside the star, I will present the first class of non-inspiral GW sources, which is powerful and abundant enough such that its detection by LVK can be imminent. The black hole-powered jets wobble inside the star and inflate an energetic bubble - cocoon, which inevitably develop turbulence with a broad power spectrum that translates into broadband, powerful quasi-isotropic GW emission within the LVK band. The GW emission is well within our observational grasp as the estimated detection rate is 0.1-3 events in LVK runs O3/O4. With a detection horizon of hundreds of Mpc, these GWs are expected to be accompanied by detectable energetic core-collapse supernova and cocoon electromagnetic counterparts, making jetted stellar explosions promising multi-messenger sources and enabling targeted GW searches.

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