Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Type Ia supernovae within dense carbon-oxygen rich envelopes: a model
  for 'Super-Chandrasekhar' explosions?   We investigate the consequences of fairly normal Type Ia supernovae being
embedded in compact and dense envelopes of carbon and oxygen rich circumstellar
material by means of detailed radiation hydrodynamic simulations. Our main
focus rests on exploring the effects of the interaction between ejecta and
circumstellar material on the ejecta evolution and the broad-band light curve.
In our calculations, we find that a strong reverse shock efficiently
decelerates and compresses the ejecta material. This leads to a significant
broadening of the optical light curve, a longer rise to maximum and a slower
decline in the tail phase. During the interaction, substantial radiative energy
is generated, which mostly emerges in the extreme ultraviolet and X-ray regime.
Only if reprocessing due to radiation-matter interactions is very efficient, a
significant boost in the optical light curve is observed. We discuss these
findings in particular in the context of the super-luminous event SN 2009dc. As
our calculations are able to reproduce a number of its peculiar properties, we
conclude that the flavour of the interaction scenario investigated in this work
constitutes a promising candidate to explain such 'Super-Chandrasekhar'
supernovae.

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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg
2
The categories of this paper are: math
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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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: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: gr-qc