Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Measured Impact of Chromatic Atmospheric Effects on Barycentric
  Corrections: Results from the EXtreme PREcision Spectrograph   One source of error in high-precision radial velocity measurements of
exoplanet host stars is chromatic change in Earth's atmospheric transmission
during observations. Mitigation of this error requires that the photon-weighted
barycentric correction be applied as a function of wavelength across the
stellar spectrum. We have designed a system for chromatic photon-weighted
barycentric corrections with the EXtreme PREcision Spectrograph (EXPRES) and
present results from the first year of operations, based on radial velocity
measurements of more than $10^3$ high-resolution stellar spectra. For
observation times longer than 250 seconds, we find that if the chromatic
component of the barycentric corrections is ignored, a range of radial velocity
errors up to 1 m s$^{-1}$ can be incurred with cross-correlation, depending on
the nightly atmospheric conditions. For this distribution of errors, the
standard deviation is 8.4 cm s$^{-1}$ for G-type stars, 8.5 cm s$^{-1}$ for
K-type stars, and 2.1 cm s$^{-1}$ for M-type stars. This error is reduced to
well-below the instrumental and photon-noise limited floor by frequent flux
sampling of the observed star with a low-resolution exposure meter
spectrograph.

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The categories of this paper are: chem-ph
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
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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: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: math