Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The circumstellar environment of pre-SN Ia systems   Here we explore the possible preexisting circumstellar debris of supernova
type Ia systems. Classical, symbiotic and recurrent novae all accrete onto
roughly solar mass white dwarfs from main sequence or Mira type companions and
result in thermonuclear runaways and expulsion of the accreted material at high
velocity. The expelled material forms a fast moving shell that eventually slows
to planetary nebula expansion velocities within several hundred years. All such
systems are recurrent and thousands of shells (each of about 0.001 Mo) snow
plough into the environment. As these systems involve common envelope binaries
the material is distributed in a non-spherical shell. These systems could be
progenitors of some SN Ia and thus explode into environments with large amounts
of accumulated gas and dust distributed in thin non-spherical shells. Such
shells should be observable around 100 years after a SN Ia event in a radio
flash as the SN Ia debris meets that of the ejected material of the systems
previous incarnation.

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The categories of this paper are: stat
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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: atom-ph
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The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
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The categories of this paper are: eess
2
The categories of this paper are: math
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
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The categories of this paper are: plasm-ph