Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Using Multiwavelength Variability to Explore the Connection between
  X-ray Emission, the Far-Ultraviolet H2 Bump, and Accretion in T Tauri Stars   The high-energy radiation fields of T Tauri stars (TTS) should affect the
surrounding circumstellar disk, having implications for disk transport and
heating. Yet, observational evidence of the effect of high-energy fields on
disks is scarce. Here we investigate the connection between X-ray emission and
the innermost gas disk by leveraging the variability of TTS. We obtained
multiple epochs of coordinated data (taken either simultaneously or within a
few hours) of accreting TTS with the Hubble Space Telescope, the Neil Gehrels
Swift Observatory, and the Chandra X-ray Observatory. We measured the
far-ultraviolet (FUV) H2 bump feature at 1600 A, which traces gas <1 AU from
the star; the near-ultraviolet (NUV) emission, from which we extract the
accretion luminosity; and also the X-ray luminosity. We do not find a
correlation between the FUV H2 bump and X-ray luminosity. Therefore, an
observable tracer of the effect of X-ray ionization in the innermost disk
remains elusive. We report a correlation between the FUV H2 bump and accretion
luminosity, linking this feature to the disk surface density. We also see a
correlation between the X-ray luminosity and the accretion column density,
implying that flaring activity may influence accretion. These results stress
the importance of coordinated multiwavelength work to understand TTS.

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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-ex
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The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat