J/A+A/648/A48 SPIRou wavelength calibration (Hobson+, 2021)
The SPIRou wavelength calibration for precise radial velocities in the near
infrared.
Hobson M.J., Bouchy F., Cook N.J., Artigau E., Moutou C., Boisse I.,
Lovis C., Carmona A., Delfosse X., Donati J.-F., the SPIRou Team
<Astron. Astrophys. 648, A48 (2021)>
=2021A&A...648A..48H 2021A&A...648A..48H (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics ; Spectroscopy
Keywords: techniques: spectroscopic - instrumentation: spectrographs -
methods: data analysis
Abstract:
SPIRou is a near-infrared (nIR) spectropolarimeter at the CFHT,
covering the YJHK nIR spectral bands (980-2350nm). We describe the
development and current status of the SPIRou wavelength calibration in
order to obtain precise radial velocities (RVs) in the nIR. We make
use of a UNe hollow-cathode lamp and a Fabry-Perot etalon to
calibrate the pixel-wavelength correspondence for SPIRou. Different
methods are developed for identifying the hollow-cathode lines, for
calibrating the wavelength dependence of the Fabry-Perot cavity
width, and for combining the two calibrators. The hollow-cathode
spectra alone do not provide a sufficiently accurate wavelength
solution to meet the design requirements of an internal error of
<0.45m/s, for an overall RV precision of 1m/s. However, the
combination with the Fabry-Perot spectra allows for significant
improvements, leading to an internal error of 0.15m/s. We examine the
inter-night stability, intra-night stability, and impact on the
stellar RVs of the wavelength solution.
Description:
We present our updated list of UNe lines for hollow-cathode UNe lamps,
derived through combining the lamp with a FP etalon, as described in
Sect. 4 of the paper. The original wavelength values come from the
catalogues of Redman et al. (2011ApJS..195...24R 2011ApJS..195...24R, Cat. J/ApJS/195/24)
or Sarmiento et al. (2018A&A...618A.118S 2018A&A...618A.118S, Cat. J/A+A/618/A118).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 24 1706 Updated list of UNe line wavelengths
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See also:
J/ApJS/195/24 : IR spectrum of Uranium hollow cathode lamps (Redman+, 2011)
J/A+A/618/A118 : Uranium line list (Sarmiento+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 nm wl0 Original wavelength
12- 24 F13.8 nm wl1 Updated wavelength
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Acknowledgements:
Melissa Hobson, melihobson(at)gmail.com
(End) Melissa Hobson [LAM], Patricia Vannier [CDS] 30-Mar-2021