Gravitational collapse of a rotating iron stellar core and physical properties of the accompanying neutrino emission

Details Gravitational collapse of a rotating iron stellar core and physical properties of the accompanying neutrino emission Gravitational collapse of a rotating iron stellar core and physical properties of the accompanying neutrino emission

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009astl...35..799i&link_type=abstract

Astronomy Letter, Vol. 35, No. 12, p. 799-815

Astronomy and Astrophysics

Astronomy

3

Gravitational Collapse, Neutrino Deposition, Quasi-One-Dimensional Hydrodynamics, Rotating Collapsar

Scientific paper

We have ascertained an important role of rotation effects in a collapsing stellar core using a quasi-one-dimensional hydrodynamic model with a rigorous allowance for the neutrino energy losses including the neutrino opacity stage. However, the neutrino scattering processes are not considered in the neutrino emission kinetics as secondary compared to the absorption processes. The quasi-one-dimensional approximation (with averaging of the expression for the centrifugal force over the polar angle) allows numerical calculations to be performed relatively easily up to the formation of a hydrostatically equilibrium neutron star after a very long stage of collapsar cooling by neutrino emission (about 2 s). We present detailed results of our numerical solution, including the neutrino spectra, with electron neutrinos making a dominant contribution to them and the contribution from electron antineutrinos being smaller by an order of magnitude. In the model under consideration, we solve the equation of matter neutronization kinetics by taking into account the main process of nuclear reactions on free nucleons, although the contribution from iron and helium nuclei is included in the equation of state.

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