Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Portable Adaptive Optics for Exoplanet Imaging   The Portable Adaptive Optics (PAO) is a low-cost and compact system, designed
for 4-meter class telescopes that have no Adaptive Optics (AO), because of the
physical space limitation at the Nasmyth or Cassegrain focus and the
historically high cost of the conventional AO. The initial scientific
observations of the PAO are focused on the direct imaging of exoplanets and
sub-stellar companions. This paper discusses the PAO concept and the associated
high-contrast imaging performance in our recent observational runs. PAO is
delivering a Strehl ratio better than 0.6 in H band under median seeing
conditions of 1 arcsec. Combined with our dedicated image rotation and
subtraction (IRS) technique and the optimized IRS (O-IRS) algorithm, the
averaged contrast ratio for a Vmag (5-9) primary star is 1.3E10-5 and 3.3E10-6
at angular distance of 0.36 arcsec under exposure time of 7 minutes and 2
hours, respectively. PAO has successfully recovered the known exoplanet of
\k{appa} And b, in our recent observation at 3.5-meter ARC telescope at Apache
Point Observatory. We have performed the associated astrometry and photometry
analysis of the recovered kappa And b planet, which gives a projected
separation of 0.984 +/- 0.05 arcsec, a position angle of 51.1 +/- 0.5 degrees,
and a mass of 10.15 (-1.255) (+2.19) MJup. These results demonstrate that PAO
can be used for direct imaging of exoplanets with medium-sized telescopes.

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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: adap-org
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The categories of this paper are: econ