CRIRES+ on sky at the ESO Very Large Telescope - Observing the Universe at infrared wavelengths and high spectral resolution

R. J. Dorn; P. Bristow; J. V. Smoker; F. Rodler; A. Lavail; M. Accardo; M. van den Ancker; D. Baade; A. Baruffolo; B. Courtney-Barrer; L. Blanco; A. Brucalassi; C. Cumani; R. Follert; A. Haimerl; A. Hatzes; M. Haug; U. Heiter; R. Hinterschuster; N. Hubin; D. J. Ives; Y. Jung; M. Jones; H.-U. Kaeufl; J.-P. Kirchbauer; B. Klein; O. Kochukhov; H. H. Korhonen; J. Köhler; J-L. Lizon; C. Moins; I. Molina-Conde; T. Marquart; M. Neeser; E. Oliva; L. Pallanca; L. Pasquini; J. Paufique; N. Piskunov; A. Reiners; D. Schneller; R. Schmutzer; U. Seemann; D. Slumstrup; A. Smette; J. Stegmeier; E. Stempels; S. Tordo; E. Valenti; J. J. Valenzuela; J. Vernet; J. Vinther; A. Wehrhahn

doi:10.1051/0004-6361/202245217

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Volume 671 (March 2023)

A&A, 671 (2023) A24

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Issue		A&A Volume 671, March 2023


Article Number		A24
Number of page(s)		16
Section		Astronomical instrumentation
DOI		https://doi.org/10.1051/0004-6361/202245217
Published online		02 March 2023

A&A 671, A24 (2023)

CRIRES⁺ on sky at the ESO Very Large Telescope

Observing the Universe at infrared wavelengths and high spectral resolution

R. J. Dorn¹, P. Bristow¹, J. V. Smoker², F. Rodler², A. Lavail³, M. Accardo¹, M. van den Ancker¹, D. Baade¹, A. Baruffolo⁴, B. Courtney-Barrer², L. Blanco², A. Brucalassi⁵, C. Cumani¹, R. Follert⁶, A. Haimerl¹, A. Hatzes⁶, M. Haug¹, U. Heiter³, R. Hinterschuster¹, N. Hubin¹, D. J. Ives¹, Y. Jung¹, M. Jones², H.-U. Kaeufl¹, J.-P. Kirchbauer¹, B. Klein¹, O. Kochukhov³, H. H. Korhonen², J. Köhler⁶, J-L. Lizon¹, C. Moins¹, I. Molina-Conde¹, T. Marquart³, M. Neeser¹, E. Oliva⁵, L. Pallanca², L. Pasquini¹, J. Paufique¹, N. Piskunov³, A. Reiners⁷, D. Schneller¹, R. Schmutzer², U. Seemann¹, D. Slumstrup², A. Smette², J. Stegmeier¹, E. Stempels³, S. Tordo¹, E. Valenti¹, J. J. Valenzuela², J. Vernet¹, J. Vinther¹ and A. Wehrhahn³

¹ European Southern Observatory, Karl-Schwarzschild Str. 2, 85748 Garching b. München, Germany
e-mail: rdorn@eso.org
² European Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, Chile
³ Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala, Sweden
⁴ INAF Osservatorio Astronomico di Padova, Vicolo Osservatorio 5, 35122 Padua, Italy
⁵ INAF Arcetri Osservatorio, Largo E. Fermi 5, 50125 Firenze, Italy
⁶ Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany
⁷ Institut für Astrophysik, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

Received: 14 October 2022
Accepted: 26 December 2022

Abstract

The CRyogenic InfraRed Echelle Spectrograph (CRIRES) Upgrade project CRIRES⁺ 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.

Key words: instrumentation: spectrographs / techniques: radial velocities / instrumentation: polarimeters / techniques: spectroscopic / instrumentation: adaptive optics

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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