Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: HD 145263: Spectral Observations of Silica Debris Disk Formation via
  Extreme Space Weathering?   We report here time domain infrared spectroscopy and optical photometry of
the HD145263 silica-rich circumstellar disk system taken from 2003 through
2014. We find an F4V host star surrounded by a stable, massive 1e22 - 1e23 kg
(M_Moon to M_Mars) dust disk. No disk gas was detected, and the primary star
was seen rotating with a rapid ~1.75 day period. After resolving a problem with
previously reported observations, we find the silica, Mg-olivine, and
Fe-pyroxene mineralogy of the dust disk to be stable throughout, and very
unusual compared to the ferromagnesian silicates typically found in primordial
and debris disks. By comparison with mid-infrared spectral features of
primitive solar system dust, we explore the possibility that HD 145263's
circumstellar dust mineralogy occurred with preferential destruction of
Fe-bearing olivines, metal sulfides, and water ice in an initially comet-like
mineral mix and their replacement by Fe-bearing pyroxenes, amorphous pyroxene,
and silica. We reject models based on vaporizing optical stellar megaflares,
aqueous alteration, or giant hypervelocity impacts as unable to produce the
observed mineralogy. Scenarios involving unusually high Si abundances are at
odds with the normal stellar absorption near-infrared feature strengths for Mg,
Fe, and Si. Models involving intense space weathering of a thin surface patina
via moderate (T < 1300 K) heating and energetic ion sputtering due to a stellar
superflare from the F4V primary are consistent with the observations. The space
weathered patina should be reddened, contain copious amounts of nanophase Fe,
and should be transient on timescales of decades unless replenished.

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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ph
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The categories of this paper are: stat
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The categories of this paper are: cs
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
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The categories of this paper are: math
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph