Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Explosions of O-Ne-Mg Cores, the Crab Supernova, and Subluminous Type
  II-P Supernovae   We present results of simulations of stellar collapse and explosions in
spherical symmetry for progenitor stars in the 8-10 solar mass range with an
O-Ne-Mg core. The simulations were continued until nearly one second after core
bounce and were performed with the Prometheus/Vertex code with a variable
Eddington factor solver for the neutrino transport, including a
state-of-the-art treatment of neutrino-matter interactions. Particular effort
was made to implement nuclear burning and electron capture rates with
sufficient accuracy to ensure a smooth continuation, without transients, from
the progenitor evolution to core collapse. Using two different nuclear
equations of state (EoSs), a soft version of the Lattimer & Swesty EoS and the
significantly stiffer Wolff & Hillebrandt EoS, we found no prompt explosions,
but instead delayed explosions, powered by neutrino heating and the
neutrino-driven baryonic wind which sets in about 200 ms after bounce. The
models eject little nickel (< 0.015 solar masses), explode with an energy of
about or slightly more than 10**50 erg, and leave behind neutron stars (NSs)
with a baryonic mass near 1.36 solar masses. Different from previous models of
such explosions, the ejecta during the first second have a proton-to-baryon
ratio of Ye > 0.46, which suggests a chemical composition that is not in
conflict with galactic abundances. No low-entropy matter with Ye << 0.5 is
ejected. This excludes such explosions as sites of a low-entropy r-process. The
low explosion energy and nucleosynthetic implications are compatible with the
observed properties of the Crab supernova, and the small nickel mass supports
the possibility that our models explain some subluminous Type II-P supernovae.

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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: math
35
The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: physics
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat