Postcollapse hydrodynamics of SN 1987A - Two-dimensional simulations of the early evolution

Details Postcollapse hydrodynamics of SN 1987A - Two-dimensional simulations of the early evolution Postcollapse hydrodynamics of SN 1987A - Two-dimensional simulations of the early evolution

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...395..642h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 395, no. 2, Aug. 20, 1992, p. 642-653. Research supported by DOE and Los Al

Astronomy and Astrophysics

Astrophysics

168

Gravitational Collapse, Hydrodynamic Equations, Neutrinos, Neutron Stars, Stellar Evolution, Supernova 1987A, Baryons, Iron, Line Spectra, Stellar Mass Accretion

Scientific paper

The first few seconds of the explosion of SN 1987A are modeled here using a 2D cylindrical geometry smooth particle hydrodynamics code. The success of the explosion is determined to be sensitive to the duration of the infall, the timing of the bounce, and the subsequent neutrino heating. A semianalytical model for the initial structure of the collapsed object is used to present two simulations that differ by the mass that has been allowed to collapse into a neutron star prior to the bounce. In the case of a short initial infall, the explosion fails due to excessive cooling. For a longer initial infall, the cooling is less and the explosion is successful although relatively weak. It is shown that in this case, a successful explosion is brought about by the presence of an entropy gradient which, combined with the gravitational pull of the neutron star, leads to extremely strong instabilities. The critical importance of the global circulation for the success of the explosion is demonstrated.

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