Deep Core Convection and Dynamo in Newly-born Neutron Star (note the unusual time!)

by Youhei Masada (Aichi University of Education, Kariy, Japan)

Tuesday 9 Mar 2021, 10:00 → 11:00 Europe/Stockholm

https://stockholmuniversity.zoom.us/j/940229961

We report results from a convection dynamo simulation of proto-neutron star (PNS), with a nuclear equation of state (EOS) and the initial hydrodynamic profile taken from a neutrino radiation-hydrodynamics simulation of a massive stellar core-collapse. A moderately-rotating PNS with the spin period of170ms in the lepton-driven convection stage is focused. We find that large-scale flow and thermodynamic fields with north-south asymmetry develop in the turbulent flow, as a consequence of the convection in the central part of the PNS,which we call “deep core convection”. Intriguingly, even with such moderate rotation, large-scale, 10^15 G, magnetic field with dipole symmetry is spontaneously built up in the PNS. The turbulent electro-motive force arising from rotationally-constrained core convection is shown to play a key role in the large-scale dynamo. The large-scale structures organized in the PNS may impact the explosion dynamics of supernovae and subsequent evolution to the neutron stars.

https://ui.adsabs.harvard.edu/abs/2020arXiv200108452M/abstract

Masada_2021_Mar_9.mp4