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CRIRES$^{+}$ on sky at the ESO Very Large Telescope

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arxiv 2301.08048 v1 pith:RQGAFUJN submitted 2023-01-19 astro-ph.IM

R. J. Dorn , P. Bristow , J. V. Smoker , F. Rodler , A. Lavail , M. Accardo , M. van den Ancker , D. Baade
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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 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
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keywords criresinstrumentcapabilitiesdetectorsspectrographtelescopeunitwavelength
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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 $\mu$m 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.

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