Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Supernovae Ib and Ic from the explosion of helium stars   Much difficulty has so far prevented the emergence of a consistent scenario
for the origin of Type Ib and Ic supernovae (SNe). Here, we follow a heuristic
approach by examining the fate of helium stars in the mass range 4 to 12Msun,
which presumably form in interacting binaries. The helium stars are evolved
using stellar wind mass loss rates that agree with observations, and which
reproduce the observed luminosity range of galactic WR stars, leading to
stellar masses at core collapse in the range 3-5.5Msun. We then explode these
models adopting an explosion energy proportional to the ejecta mass, roughly
consistent with theoretical predictions. We impose a fixed 56Ni mass and strong
mixing. The SN radiation from 3 to 100d is computed self-consistently starting
from the input stellar models using the time-dependent non-local thermodynamic
equilibrium radiative-transfer code CMFGEN. By design, our fiducial models
yield similar light curves, with a rise time of ~20d and a peak luminosity of
~10^42.2erg/s, in line with representative SNe Ibc. The less massive
progenitors retain a He-rich envelope and reproduce the color, line widths, and
line strengths of a representative sample of SNe Ib, while stellar winds remove
most of the helium in more massive progenitors, whose spectra match typical SNe
Ic in detail. The transition between the predicted Ib-like and Ic-like spectra
is continuous, but it is sharp, such that the resulting models essentially form
a dichotomy. Further models computed with varying explosion energy, 56Ni mass,
and long-term power injection from the remnant show that a moderate variation
of these parameters can reproduce much of the diversity of SNe Ibc. We conclude
that stars stripped by a binary companion can account for the vast majority of
ordinary SNe Ib and Ic, and that stellar wind mass loss is the key to remove
the helium envelope in SN Ic progenitors. [abridged]

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The categories of this paper are: atom-ph
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The categories of this paper are: stat
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: physics
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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys