| Issue |
A&A
Volume 648, April 2021
|
|
|---|---|---|
| Article Number | A48 | |
| Number of page(s) | 11 | |
| Section | Astronomical instrumentation | |
| DOI | https://doi.org/10.1051/0004-6361/202038413 | |
| Published online | 09 April 2021 | |
The SPIRou wavelength calibration for precise radial velocities in the near infrared⋆,⋆⋆
1
Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France
e-mail: mhobson@astro.puc.cl
2
Millennium Institute for Astrophysics, Santiago, Chile
3
Observatoire Astronomique de l’Université de Genéve, 51 Chemin des Maillettes, 1290 Versoix, Switzerland
4
Institut de Recherche sur les Exoplanétes (IREx), Département de Physique, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, QC H3C 3J7, Canada
5
Univ. de Toulouse, CNRS, IRAP, 14 avenue Belin, 31400 Toulouse, France
6
Canada-France-Hawaii Telescope Corporation, 65-1238 Mamalahoa Hwy, Kamuela, HI 96743, USA
7
Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
Received:
13
May
2020
Accepted:
18
January
2021
Aims. SPIRou is a near-infrared (nIR) spectropolarimeter at the CFHT, covering the YJHK nIR spectral bands (980−2350 nm). We describe the development and current status of the SPIRou wavelength calibration in order to obtain precise radial velocities (RVs) in the nIR.
Methods. We make use of a UNe hollow-cathode lamp and a Fabry-Pérot étalon 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-Pérot cavity width, and for combining the two calibrators.
Results. The hollow-cathode spectra alone do not provide a sufficiently accurate wavelength solution to meet the design requirements of an internal error of < 0.45 m s−1, for an overall RV precision of 1 m s−1. However, the combination with the Fabry-Pérot spectra allows for significant improvements, leading to an internal error of ∼0.15 m s−1. We examine the inter-night stability, intra-night stability, and impact on the stellar RVs of the wavelength solution.
Key words: techniques: spectroscopic / instrumentation: spectrographs / methods: data analysis
Full Table A.1 is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/648/A48
Based on observations obtained at the Canada-France-Hawaii Telescope (CFHT), which is operated from the summit of Maunakea by the National Research Council of Canada, the Institut National des Sciences de l’Univers of the Centre National de la Recherche Scientifique of France, and the University of Hawaii. The observations at the Canada-France-Hawaii Telescope were performed with care and respect from the summit of Maunakea which is a significant cultural and historic site. Based on observations obtained with SPIRou (SpectroPolarimetre InfraRouge), an international project led by Institut de Recherche en Astrophysique et Planétologie, Toulouse, France.
© M. J. Hobson et al. 2021
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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