Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: K-Stacker, an algorithm to hack the orbital parameters of planets hidden
  in high-contrast imaging. First applications to VLT SPHERE multi-epoch
  observations   Recent high-contrast imaging surveys, looking for planets in young, nearby
systems showed evidence of a small number of giant planets at relatively large
separation beyond typically 20 au where those surveys are the most sensitive.
Access to smaller physical separations between 5 and 20 au is the next step for
future planet imagers on 10 m telescopes and ELTs in order to bridge the gap
with indirect techniques (radial velocity, transit, astrometry with Gaia). In
that context, we recently proposed a new algorithm, Keplerian-Stacker,
combining multiple observations acquired at different epochs and taking into
account the orbital motion of a potential planet present in the images to boost
the ultimate detection limit. We showed that this algorithm is able to find
planets in time series of simulated images of SPHERE even when a planet remains
undetected at one epoch. Here, we validate the K-Stacker algorithm performances
on real SPHERE datasets, to demonstrate its resilience to instrumental speckles
and the gain offered in terms of true detection. This will motivate future
dedicated multi-epoch observation campaigns in high-contrast imaging to search
for planets in emitted and reflected light. Results. We show that K-Stacker
achieves high success rate when the SNR of the planet in the stacked image
reaches 7. The improvement of the SNR ratio goes as the square root of the
total exposure time. During the blind test and the redetection of HD 95086 b,
and betaPic b, we highlight the ability of K-Stacker to find orbital solutions
consistent with the ones derived by the state of the art MCMC orbital fitting
techniques, confirming that in addition to the detection gain, K-Stacker offers
the opportunity to characterize the most probable orbital solutions of the
exoplanets recovered at low signal to noise.

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The categories of this paper are: hep-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: physics
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: ao-sci