Magnetorotational Mechanism of the Explosion of Core-Collapse Supernovae. (arXiv:1903.12628v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Bisnovatyi_Kogan_G/0/1/0/all/0/1">G. S. Bisnovatyi-Kogan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Moiseenko_S/0/1/0/all/0/1">S. G. Moiseenko</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ardelyan_N/0/1/0/all/0/1">N. V. Ardelyan</a>
The idea of the magnetorotational explosion mechanism is that the energy of
rotation of the neutron star formed in the course of a collapse is transformed
into the energy of an expanding shock wave by means of a magnetic field. In the
two-dimensional case, the time of this transformation depends weakly on the
initial strength of the poloidal magnetic field because of the development of a
magnetorotational instability. Differential rotation leads to the twisting and
growth of the toroidal magnetic-field component, which becomes much stronger
than the poloidal component. In the case where the initial configuration of the
magnetic field is close to a dipole configuration, the ejection of matter has a
jet character, whereas, in the case of a quadrupole configuration, there arises
an equatorial ejection. In either case, the energy release is sufficient for
explaining the observed average energy of supernova explosion. Neutrinos are
emitted as the collapse and the formation of a rapidly rotating neutron star
proceeds. In addition, neutrino radiation arises in the process of
magnetorotational explosion owing to additional rotational-energy losses. In
order to explain an interval of 4.5 hours between the two observed neutrino
signals from SN 1987A, it is necessary to assume a weakening of the
magnetorotional instability and a small initial magnetic field (10(9)-10(10)G)
in the newly formed rotating neutron star. The existence of a black hole in the
SN 1987A remnant could explain the absence of any visible pointlike source at
the center of the explosion.
The idea of the magnetorotational explosion mechanism is that the energy of
rotation of the neutron star formed in the course of a collapse is transformed
into the energy of an expanding shock wave by means of a magnetic field. In the
two-dimensional case, the time of this transformation depends weakly on the
initial strength of the poloidal magnetic field because of the development of a
magnetorotational instability. Differential rotation leads to the twisting and
growth of the toroidal magnetic-field component, which becomes much stronger
than the poloidal component. In the case where the initial configuration of the
magnetic field is close to a dipole configuration, the ejection of matter has a
jet character, whereas, in the case of a quadrupole configuration, there arises
an equatorial ejection. In either case, the energy release is sufficient for
explaining the observed average energy of supernova explosion. Neutrinos are
emitted as the collapse and the formation of a rapidly rotating neutron star
proceeds. In addition, neutrino radiation arises in the process of
magnetorotational explosion owing to additional rotational-energy losses. In
order to explain an interval of 4.5 hours between the two observed neutrino
signals from SN 1987A, it is necessary to assume a weakening of the
magnetorotional instability and a small initial magnetic field (10(9)-10(10)G)
in the newly formed rotating neutron star. The existence of a black hole in the
SN 1987A remnant could explain the absence of any visible pointlike source at
the center of the explosion.
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