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

M. J. Hobson; F. Bouchy; N. J. Cook; E. Artigau; C. Moutou; I. Boisse; C. Lovis; A. Carmona; X. Delfosse; J. -F. Donati; the SPIRou Team

doi:10.1051/0004-6361/202038413

paper

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

arXiv:2102.02324 · doi:10.1051/0004-6361/202038413

Abstract

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. 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 $< 0.45 m s^{- 1}$ , 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 $\sim 0.15 m s^{- 1}$ . We examine the inter-night stability, intra-night stability, and impact on the stellar RVs of the wavelength solution.

12 pages, 9 figures. Accepted to A&A

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

Abstract

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