Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for spatially-correlated ${\it Gaia}$ parallax errors in the
  ${\it Kepler}$ field   We present evidence for a spatially-dependent systematic error in the first
data release of ${\it Gaia}$ parallaxes based on comparisons to asteroseismic
parallaxes in the ${\it Kepler}$ field, and present a parametrized model of the
angular dependence of these systematics. We report an error of
$0.059^{+0.004}_{-0.004}$mas on scales of 0.3deg, which decreases for larger
scales to become $0.011^{+0.006}_{-0.004}$mas at 8deg. This is consistent with
the $\sim2\%$ zeropoint offset for the whole sample discussed by Huber et al.,
and is compatible with the effect predicted by the ${\it Gaia}$ team. Our
results are robust to dust prescriptions and choices in temperature scales used
to calculate asteroseismic parallaxes. We also do not find evidence for
significant differences in the signal when using red clump versus red giant
stars. Our approach allows us to quantify and map the correlations in an
astrophysically interesting field, resulting in a parametrized model of the
spatial systematics that can be used to construct a covariance matrix for any
work that relies upon TGAS parallaxes.

13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph