Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exploring the RCrA environment with SPHERE: Discovery of a new stellar
  companion   Aims. R Coronae Australis (R CrA) is the brightest star of the Coronet nebula
of the Corona Australis (CrA) star forming region. It has very red colors,
probably due to dust absorption and it is strongly variable. High contrast
instruments allow for an unprecedented direct exploration of the immediate
circumstellar environment of this star. Methods. We observed R CrA with the
near-IR channels (IFS and IRDIS) of SPHERE at VLT. In this paper, we used four
different epochs, three of them from open time observations while one is from
the SPHERE guaranteed time. The data were reduced using the DRH pipeline and
the SPHERE Data Center. On the reduced data we implemented custom IDL routines
with the aim to subtract the speckle halo.We have also obtained pupil-tracking
H-band (1.45-1.85 micron) observations with the VLT/SINFONI near-infrared
medium-resolution (R~3000) spectrograph. Results. A companion was found at a
separation of 0.156" from the star in the first epoch and increasing to 0.18400
in the final one. Furthermore, several extended structures were found around
the star, the most noteworthy of which is a very bright jet-like structure
North-East from the star. The astrometric measurements of the companion in the
four epochs confirm that it is gravitationally bound to the star. The SPHERE
photometry and the SINFONI spectrum, once corrected for extinction, point
toward an early M spectral type object with a mass between 0.3 and 0.55 M?. The
astrometric analyis provides constraints on the orbit paramenters: e~0.4,
semi-major axis at 27-28 au, inclination of ~ 70{\deg} and a period larger than
30 years. We were also able to put constraints of few MJup on the mass of
possible other companions down to separations of few tens of au.

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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga