Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A triple star in disarray -- Multi-epoch observations of T Tauri with
  VLT-SPHERE and LBT-LUCI   T Tauri remains an enigmatic triple star for which neither the evolutionary
state of the stars themselves, nor the geometry of the complex outflow system
is completely understood. Eight-meter class telescopes equipped with
state-of-the-art adaptive optics provide the spatial resolution necessary to
trace tangential motion of features over a timescale of a few years, and they
help to associate them with the different outflows. We used J-, H-, and K-band
high-contrast coronagraphic imaging with VLT-SPHERE recorded between 2016 and
2018 to map reflection nebulosities and obtain high precision near-infrared
(NIR) photometry of the triple star. We also present molecular hydrogen
emission maps of the 1-0 S(1) line at 2.122 micron obtained with LBT-LUCI
during its commissioning period at the end of 2016. The data reveal a number of
new features in the system, some of which are seen in reflected light and some
are seen in H2 emission; furthermore, they can all be associated with the main
outflows. The tangential motion of the features provides compelling evidence
that T Tauri Sb drives the southeast-northwest outflow. T Tauri Sb has recently
faded probably because of increased extinction as it passes through the
southern circumbinary disk. While T Tauri Sb is approaching periastron, T Tauri
Sa instead has brightened and is detected in all our J-band imagery for the
first time.

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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ph
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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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: alg-geom
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The categories of this paper are: nlin
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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: hep-ex