Impact of rotation on the evolution of convective vortices in collapsing stars

Abstract

We study the impact of rotation on the hydrodynamic evolution of convective vortices during stellar collapse. Using linear hydrodynamics equations, we study the evolution of the vortices from their initial radii in convective shells down to smaller radii where they are expected to encounter the supernova shock. We find that the evolution of vortices is mainly governed by two effects: the acceleration of infall and the accompanying speed up of rotation. The former effect leads to the radial stretching of vortices, which limits the vortex velocities. The latter effect leads to the angular deformation of vortices in the direction of rotation, amplifying their non-radial velocity. We show that the radial velocities of the vortices are not significantly affected by rotation. We study acoustic wave emission and find that it is not sensitive to rotation. Finally, we analyze the impact of the corotation point and find that it has a small impact on the overall acoustic wave emission.

12 pages, 8 figures. Accepted for publication in MNRAS

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• 3D Simulations of Strongly Magnetised Non-Rotating Supernovae: Explosion Dynamics and Remnant Properties
• Efficient estimation method for time evolution of proto-neutron star mass and radius from supernova neutrino signal
• Standing Accretion Shock Instability in the Collapse of a Rotating Stellar Core
• Assessing the Distance for Probing the Nuclear Equation of State with Supernova Gravitational Waves