Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Connection between Submillimeter Continuum Flux and Binary
  Separation in Young Binaries: Evidence of Interaction between Stars and Disks   We present 800 micron continuum photometry of pre-main-sequence binary stars
with projected separations a_p < 150 AU in the Sco-Oph star-forming region.
Combining our observations with published 1300 micron photometry, we find that
binaries in Sco-Oph with 1 < a_p < 50--100 AU have lower submillimeter fluxes
than wider binaries or single stars, as previously found for Taurus- Auriga
binaries. The wide binaries and single stars have indistinguishable
submillimeter flux distributions. Thus, binary companions with separations less
than 50--100 AU significantly influence the nature of associated disks.
  We have explored the hypothesis that the reduction in submillimeter flux is
the result of gaps cleared in disks by companions. Gap clearing produces the
qualitative dependence of submillimeter flux on binary separation, and a simple
model suggests that large gaps in disks with surface densities typical of
wide-binary or single-star disks can reduce submillimeter fluxes to levels
consistent with the observed limits. This model shows that the present
submillimeter flux upper limits do not necessarily imply a large reduction in
disk surface densities.
  Two-thirds of the young binaries were detected by IRAS, showing that most
binaries have circumstellar disks. These fluxes place lower limits of 10^{-5}
M_sun on circumstellar disk masses. The submillimeter fluxes place upper limits
of 0.005 M_sun on circumbinary disk masses. Thus massive circumbinary disks are
rare among binaries with separations between a few AU and 100 AU. Circumbinary
disks are found around some close binaries.

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The categories of this paper are: hep-ex
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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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: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: cond-mat
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The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom