MG12 - Talk detail
 

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Abstract

Probing the Core-Collapse Supernova Mechanism with Gravitational Waves

Despite many decades of concerted theoretical effort and numerical modeling, the details of the core-collapse supernova explosion mechanism are still under debate. Indications are strong that the supernova mechanism is intrinsically multi-dimensional and involves (a combination of) postbounce energy deposition by neutrinos, convective instability, the standing-accretion-shock instability (SASI), protoneutron star core oscillations, rotation, and magneto-hydrodynamic effects. I review the current status of core-collapse supernova modeling and introduce the ensemble of candidate explosion mechanisms that is emerging from recent multi-dimensional simulations. I go on to discuss gravitational-wave (GW) emission processes in core-collapse supernovae and present new results on the supernova gravitational-wave signature that were obtained with 2D/3D general relativistic and Newtonian simulations. I demonstrate how GWs observed by current and future LCGT/advLIGO-class detectors could be used to constrain the core-collapse supernova explosion mechanism.

Gravitational Waves from Convection, SASI and the Onset of Explosion in Core-Collapse Supernovae

We present new results on the gravitational wave (GW) emission in the postbounce phase of nonrotating or slowly rotating core-collapse supernovae obtained from an extensive set of simulations with the 2D code BETHE/Hydro. Our calculations include the most recent presupernova stellar models, a finite-temperature nuclear equation of state and a prescription for neutrino cooling and heating. Investigating the postbounce evolution of progenitors of 12, 15, 20, and 40 solar masses with multiple parametrized neutrino luminosities, we for the first time establish the systematics with progenitor star mass and neutrino luminosity of the GW signal emitted by neutrino-driven convection and the standing-accretion-shock instability. In addition, we identify the GW signal associated with the onset of a neutrino-driven core-collapse supernova explosion.

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