Dorn, R. J.R. J.DornBristow, P.P.BristowSmoker, J. V.J. V.SmokerRodler, F.F.RodlerLavail, A.A.LavailAccardo, M.M.Accardovan den Ancker, M.M.van den AnckerBaade, D.D.BaadeBARUFFOLO, AndreaAndreaBARUFFOLOCourtney-Barrer, B.B.Courtney-BarrerBlanco, L.L.BlancoBRUCALASSI, AnnaAnnaBRUCALASSICumani, C.C.CumaniFollert, R.R.FollertHaimerl, A.A.HaimerlHatzes, A.A.HatzesHaug, M.M.HaugHeiter, U.U.HeiterHinterschuster, R.R.HinterschusterHubin, N.N.HubinIves, D. J.D. J.IvesJung, Y.Y.JungJones, M.M.JonesKaeufl, H. -U.H. -U.KaeuflKirchbauer, J. -P.J. -P.KirchbauerKlein, B.B.KleinKochukhov, O.O.KochukhovKorhonen, H. H.H. H.KorhonenKöhler, J.J.KöhlerLizon, J. -L.J. -L.LizonMoins, C.C.MoinsMolina-Conde, I.I.Molina-CondeMarquart, T.T.MarquartNeeser, M.M.NeeserOLIVA, ErnestoErnestoOLIVAPallanca, L.L.PallancaPasquini, L.L.PasquiniPaufique, J.J.PaufiquePiskunov, N.N.PiskunovReiners, A.A.ReinersSchneller, D.D.SchnellerSchmutzer, R.R.SchmutzerSeemann, U.U.SeemannSlumstrup, D.D.SlumstrupSmette, A.A.SmetteStegmeier, J.J.StegmeierStempels, E.E.StempelsTordo, S.S.TordoValenti, E.E.ValentiValenzuela, J. J.J. J.ValenzuelaVernet, J.J.VernetVinther, J.J.VintherWehrhahn, A.A.Wehrhahn2025-02-192025-02-1920230004-6361http://hdl.handle.net/20.500.12386/36071The CRyogenic InfraRed Echelle Spectrograph (CRIRES) Upgrade project CRIRES<SUP>+</SUP> extended the capabilities of CRIRES. It transformed this VLT instrument into a cross-dispersed spectrograph to increase the wavelength range that is covered simultaneously by up to a factor of ten. In addition, a new detector focal plane array of three Hawaii 2RG detectors with a 5.3 μm cutoff wavelength replaced the existing detectors. Amongst many other improvements, a new spectropolarimetric unit was added and the calibration system has been enhanced. The instrument was installed at the VLT on Unit Telescope 3 at the beginning of 2020 and successfully commissioned and verified for science operations during 2021, partly remotely from Europe due to the COVID-19 pandemic. The instrument was subsequently offered to the community from October 2021 onwards. This article describes the performance and capabilities of the upgraded instrument and presents on sky results.STAMPAenArticle10.1051/0004-6361/2022452172-s2.0-85149637065https://www.aanda.org/articles/aa/full_html/2023/03/aa45217-22/aa45217-22.htmlhttp://arxiv.org/abs/2301.08048v12023A&A...671A..24DFIS/05 - ASTRONOMIA E ASTROFISICA