Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-08-22
NewAstron.13:386-394,2008
Astronomy and Astrophysics
Astrophysics
16 pages, 3 figures, submitted to New Astronomy
Scientific paper
10.1016/j.newast.2007.12.002
We compute the structure and degree of neutronization of general relativistic magnetohydrodynamic (GRMHD) outflows originating from the inner region of neutrino-cooled disks. We consider both, outflows expelled from a hydrostatic disk corona and outflows driven by disk turbulence. We show that in outflows driven thermally from a static disk the electron fraction quickly evolves to its equilibrium value which is dominated by neutrino capture. Those outflows are generally proton rich and, under certain conditions, can be magnetically dominated. They may also provide sites for effective production of 56Ni. Centrifugally driven outflows and outflows driven by disk turbulence, on the other hand, can preserve the large in-disk neutron excess. Those outflows are, quite generally, subrelativistic by virtue of the large mass flux driven by the additional forces.
Barzilay Yudith
Levinson A. A.
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