J/A+A/648/A48ivo://CDS.VizieR/J/A+A/648/A48doi:10.26093/cds/vizier.36480048CDSHobson M.J.Bouchy F.Cook N.J.Artigau E.Moutou C.Boisse I.,Lovis C.Carmona A.Delfosse X.Donati J.-F.the SPIRou Team2021-09-16T10:23:47Z2021-04-09T06:36:27ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fratomic-physicsspectroscopySPIRou 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.2021A&A...648A..48Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/648/A48CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJS/195/24 : IR spectrum of Uranium hollow cathode lamps (Redman+, 2011)J/A+A/618/A118 : Uranium line list (Sarmiento+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/648/A48https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/648/A48http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/648/A48https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/648/A48https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/648/A48http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/648/A48GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/648/A48/table1Updated list of UNe line wavelengthswl1Updated wavelengthnmem.wldoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintwl0Original wavelengthnmem.wldouble