Two-Dimensional Simulation of the Dynamics of the Collapse of a Rotating Core with Formation of a Neutron Star on an Adaptive Triangular Grid in Lagrangian Coordinates

Authors: Ardeljan N.V.¹; Bisnovatyi-Kogan G.S.²; Kosmachevskii K.V.¹; Moiseenko S.G.³

Source: Astrophysics, Volume 47, Number 1, January 2004 , pp. 37-51(15)

Publisher: Springer

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Abstract:

Results are presented from a two-dimensional numerical simulation of the collapse of a rotating core with formation of a neutron star that has strong differential rotation in its outer regions. A specially developed numerical method is used which is based on a fully conservative implicit operator difference scheme for gravitational gas dynamics problems in lagrangian coordinates on a variable-structure triangular grid. The recoil shock wave generated by the collapse causes ejection of a small amount of material. This cannot explain the explosion of type II supernovae. The strong differential rotation in the presence of even a weak initial magnetic field obtained in these calculations must lead to a rise in the magnetic pressure, formation of an MHD shock wave, and conversion of rotational energy into the energy of radial expansion (magnetorotational supernova explosion).

Keywords: neutron stars theory

Document Type: Research article

DOI: http://dx.doi.org/10.1023/B:ASYS.0000017235.31261.a0

Affiliations: 1: Faculty of Computer Science and Cybernetics, Moscow State University, Russia 2: Institute for Space Studies, Russian Academy of Sciences, Russia, Email: gkogan@mx.iki.rssi.ru 3: Institute for Space Studies, Russian Academy of Sciences, Russia, Email: moiseenko@mx.iki.rssi.ru

Publication date: 2004-01-01