Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of the dust in V4332 Sagittarii   An eruptive nova-like event took place in 1994 in the stellar-merger
candidate V4332 Sgr. Following the eruption, dust consisting of refractory
silicate rich dust grains containing a significant component of AlO bonding was
formed sometime between 1998 and 2003. Observations using Spitzer between 2005
and 2009 show significant changes in the 10 micron silicate stretch feature.
There is a deepening of the 10 micron silicate stretch as well as the
development of a feature between about 13 and 20 microns consistent with a
blend of the MgO and FeO stretching features and the O-Si-O bending mode of
increasingly ordered silicate dust. Near-infrared observations show the
presence of AlO and water vapor in the outflow in 2003, 2004 and 2005: the AlO
has significantly decreased in spectra obtained in 2014 while the water vapor
remains largely unchanged. An attempt is made to correlate these observations
and understand the significance of these changes using DUSTY modeling. The
observations appear consistent with the kinetically-controlled, condensation of
highly under-oxidized SiO/AlO/Fe/Mg dust grains in the outflow followed by the
continuous evolution of the initial condensate due to thermal annealing and
oxidation of the dust via reaction with ambient O, OH and H2O in the expanding,
cooling shell. Periodic monitoring of this dust shell over the mid-infrared
spectral range could yield useful information on the evolution of
under-oxidized silicate condensates exposed to hot water vapor in more
conventional circumstellar environments.

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The categories of this paper are: math-ph
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The categories of this paper are: physics
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: acc-phys