Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deviations From Axisymmetry Revealed by Line Polarization in the Normal
  Type Ia SN 2004S   We present a single epoch of high signal-to-noise ratio spectropolarimetry of
the Type Ia supernova (SN Ia) 2004S taken nine days after maximum light. The
flux spectrum is normal, but with the additional presence of high-velocity (HV)
line features in both Ca II and Fe II. The object shows continuum polarization
at the 0.4% level in the red, a value which appears to be typical of SNe Ia.
The continuum data are consistent with a ~10% global asphericity in an
axisymmetric geometry. Unlike previous observations of other SNe Ia with HV
features, the HV features in SN 2004S show no strong polarimetric signature,
though this may be due to the timing of our observations. Instead, the object
shows line polarization features (P < 0.5%) that are rotated with respect to
the axis of symmetry of the continuum. The line features are visible in Si II,
Fe II, and Ca II, and appear to be narrowly confined in velocity space just
above the photosphere. These polarization features are a result of
compositional inhomogeneities in the ejecta. They may represent newly
synthesized elements whose clumpy spatial distribution within the ejecta is
distinct from that of the globally aspherical ejecta as a whole.

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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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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: chem-ph
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: cond-mat
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
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The categories of this paper are: cs
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The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: math
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex