Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Connecting X-ray and Infrared Variability among Young Stellar Objects:
  Ruling out potential sources of disk fluctuations   Variability in the infrared emission from disks around pre-main sequence
stars over the course of days to weeks appears to be common, but the physical
cause of the changes in disk structure are not constrained. Here we present
coordinated monitoring of one young cluster with the Spitzer and Chandra space
telescopes aimed at studying the physical source of the variability. In fall
2011 we obtained ten epochs of Chandra ACIS photometry over a period of 30 days
with a roughly 3 day cadence contemporaneous with 20 epochs of Spitzer
[3.6],[4.5] photometry over 40 days with a roughly 2 day cadence of the IC 348
cluster. This cadence allows us to search for week to month long responses of
the infrared emission to changes in the high-energy flux. We find no strong
evidence for a direct link between the X-ray and infrared variability on these
timescales among 39 cluster members with circumstellar disks. There is no
significant correlation between the shape of the infrared and X-ray light
curves, or between the size of the X-ray and infrared variability. Among the
stars with an X-ray flare none showed evidence of a correlated change in the
infrared photometry on timescales of days to weeks following the flare. This
lack of connection implies that X-ray heating of the planet forming region of
the disk is not significant, although we cannot rule out rapid or instantaneous
changes in infrared emission.

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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ph
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The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: cs
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: math
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The categories of this paper are: cmp-lg