Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The inner structure of the TW Hya Disk as revealed in scattered light   We observe a significant change in the TW Hya disk interior to 40~AU via
archival unpolarized multi-wavelength Hubble Space Telescope/STIS and NICMOS
images with an inner working angle (IWA) of 0\farcs4 (22~AU). Our images show
the outer edge of a clearing at every wavelength with similar behavior,
demonstrating that the feature is structural, rather than due to some property
of polarized light in the disk. We compare our observations to those taken by
Akiyama et al. (2015) and Rapson et al. (2015), and discuss the spectral
evolution of the disk interior to 80~AU. We construct a model with two gaps:
one at 30~AU and one at 80~AU that fit the observed surface brightness profile
but overpredicts the absolute brightness of the disk. Our models require an
additional dimming to be consistent with observations, which we tentatively
ascribe to shadowing. The gap structures seen in scattered light are spatially
coincident with sub-mm detections of CO and N$_2$H$^+$, and are near expected
condensation fronts of these molecular species, providing tentative evidence
that the structures seen in scattered light may be correlated with chemical
changes in the disk.

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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: physics
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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: econ