Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Recurring Occultations of RW Aurigae by Coagulated Dust in the Tidally
  Disrupted Circumstellar Disk   We present photometric observations of RW Aurigae, a Classical T Tauri
system, that reveal two remarkable dimming events. These events are similar to
that which we observed in 2010-2011, which was the first such deep dimming
observed in RW Aur in a century's worth of photometric monitoring. We suggested
the 2010-2011 dimming was the result of an occultation of the star by its
tidally disrupted circumstellar disk. In 2012-2013, the RW Aur system dimmed by
~0.7 mag for ~40 days and in 2014/2015 the system dimmed by ~2 mag for >250
days. The ingress/egress duration measurements of the more recent events agree
well with those from the 2010-2011 event, providing strong evidence that the
new dimmings are kinematically associated with the same occulting source.
Therefore, we suggest that both the 2012-2013 and 2014-2015 dimming events,
measured using data from the Kilodegree Extremely Little Telescope and the
Kutztown University Observatory, are also occultations of RW Aur A by tidally
disrupted circumstellar material. Recent hydrodynamical simulations of the
eccentric fly-by of RW Aur B suggest the occulting body to be a bridge of
material connecting RW Aur A and B. These simulations suggest the possibility
of additional occultations, supported by the observations presented in this
work. The color evolution of the dimmings suggest that the tidally stripped
disk material includes dust grains ranging in size from small grains at the
leading edge, typical of star forming regions, to large grains, ices or pebbles
producing grey or nearly grey extinction deeper within the occulting material.
It is not known whether this material represents arrested planet building prior
to the tidal disruption event, or perhaps accelerated planet building as a
result of the disruption event, but in any case the evidence suggests the
presence of advanced planet building material in the space between RW Aur A and
B.

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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: stat
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The categories of this paper are: math
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The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
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The categories of this paper are: cond-mat
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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: alg-geom