Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multidimensional Models of Type Ia Supernova Nebular Spectra: Strong
  Emission Lines from Stripped Companion Gas Rule Out Classic Single Degenerate
  Systems   The classic single-degenerate model for the progenitors of Type Ia Supernova
(SN Ia) predicts that the supernova ejecta should be enriched with solar-like
abundance material stripped from the companion star. Spectroscopic observations
of normal SNe Ia at late times, however, have not resulted in definite
detection of hydrogen. In this Letter, we study line formation in SNe Ia at
nebular times using non-LTE spectral modeling. We present, for the first time,
multidimensional radiative transfer calculations of SNe Ia with stripped
material mixed in the ejecta core, based on hydrodynamical simulations of
ejecta-companion interaction. We find that interaction models with main
sequence companions produce significant H$\alpha$ emission at late times,
ruling out this type of binaries being viable progenitors of SNe Ia. We also
predict significant He I line emission at optical and near-infrared wavelengths
for both hydrogen-rich or helium-rich material, providing an additional
observational probe of stripped ejecta. We produce models with reduced stripped
masses and find a more stringent mass limit of $M_{st} \lesssim 1\times 10^{-4}
M_\odot$ of stripped companion material for SN 2011fe.

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The categories of this paper are: plasm-ph
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: physics
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The categories of this paper are: math
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: stat