Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aps..apr.m8004s&link_type=abstract
American Physical Society, APS April Meeting, April 14-17, 2007, abstract #M8.004
Astronomy and Astrophysics
Astrophysics
Scientific paper
We consider the effects of magnetic fields on the evolution of differentially rotating neutron stars, which can be formed in stellar core collapse or binary neutron star coalescence. Simulations are carried out in axisymmetry using a code which integrates the coupled Einstein-Maxwell-MHD equations. Magnetic braking and the magnetorotational instability (MRI) both play important roles in the evolution. Our simulations show that the fate of the star depends on its mass and spin. The most interesting case is that of the hypermassive neutron star, for which the magnetic field leads to catastrophic collapse. The newly-formed black hole is surrounded by a hot, magnetized torus undergoing quasistationary accretion. We demonstrate that this system is a promising candidate for producing a short gamma-ray burst.
Duez Matthew
Liu Yuk Tung
Shapiro Stuart
Shibata Masaru
Stephens Branson
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