Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Accounting for Chromatic Atmospheric Effects on Barycentric Corrections   Atmospheric effects on stellar radial velocity measurements for exoplanet
discovery and characterization have not yet been fully investigated for extreme
precision levels. We carry out calculations to determine the wavelength
dependence of barycentric corrections across optical wavelengths, due to the
ubiquitous variations in air mass during observations. We demonstrate that
radial velocity errors of at least several cm/s can be incurred if the
wavelength dependence is not included in the photon-weighted barycentric
corrections. A minimum of four wavelength channels across optical spectra
(380-680 nm) are required to account for this effect at the 10 cm/s level, with
polynomial fits of the barycentric corrections applied to cover all
wavelengths. Additional channels may be required in poor observing conditions
or to avoid strong telluric absorption features. Furthermore, consistent flux
sampling on the order of seconds throughout the observation is necessary to
ensure that accurate photon weights are obtained. Finally, we describe how a
multiple-channel exposure meter will be implemented in the EXtreme PREcision
Spectrograph (EXPRES).

8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs