The SPIRou wavelength calibration for precise radial velocities in the near infrared

Abstract

SPIRou is a near-infrared (nIR) spectropolarimeter at the CFHT, covering the YJHK nIR spectral bands ($980-2350\mathrm{nm}$). 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-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. The hollow-cathode spectra alone do not provide a sufficiently accurate wavelength solution to meet the design requirements of an internal error of $<0.45\mathrm{m}{\mathrm{s}}^{-1}$, for an overall RV precision of $1\mathrm{m}{\mathrm{s}}^{-1}$. However, the combination with the Fabry-Pérot spectra allows for significant improvements, leading to an internal error of $\sim 0.15\mathrm{m}{\mathrm{s}}^{-1}$. We examine the inter-night stability, intra-night stability, and impact on the stellar RVs of the wavelength solution.

arXiv comment12 pages, 9 figures. Accepted to A&A

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