Wavelength calibration from 1-5μm for the CRIRES+ high-resolution spectrograph at the VLT

U. Seemann; G. Anglada-Escude; D. Baade; P. Bristow; R. J. Dorn; R. Follert; D. Gojak; J. Grunhut; A. P. Hatzes; U. Heiter; D. J. Ives; P. Jeep; Y. Jung; H.-U. Käufl; F. Kerber; B. Klein; J.-L. Lizon; M. Lockhart; T. Löwinger; T. Marquart; E. Oliva; J. Paufique; N. Piskunov; Eszter Pozna; A. Reiners; A. Smette; J. Smoker; E. Stempels; E. Valenti

doi:10.1117/12.2056668

6 August 2014 Wavelength calibration from 1-5μm for the CRIRES+ high-resolution spectrograph at the VLT

U. Seemann, G. Anglada-Escude, D. Baade, P. Bristow, R. J. Dorn, R. Follert, D. Gojak, J. Grunhut, A. P. Hatzes, U. Heiter, D. J. Ives, P. Jeep, Y. Jung, H.-U. Käufl, F. Kerber, B. Klein, J.-L. Lizon, M. Lockhart, T. Löwinger, T. Marquart, E. Oliva, J. Paufique, N. Piskunov, Eszter Pozna, A. Reiners, A. Smette, J. Smoker, E. Stempels, E. Valenti

Author Affiliations +

Proceedings Volume 9147, Ground-based and Airborne Instrumentation for Astronomy V; 91475G (2014) https://doi.org/10.1117/12.2056668
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

CRIRES at the VLT is one of the few adaptive optics enabled instruments that offer a resolving power of 10⁵ from 1 − 5 μm. An instrument upgrade (CRIRES+) is proposed to implement cross-dispersion capabilities, spectro-polarimetry modes, a new detector mosaic, and a new gas absorption cell. CRIRES+ will boost the simultaneous wavelength coverage of the current instrument (~ γ/70 in a single-order) by a factor of 10 in the cross-dispersed configuration, while still retaining a ~> 10 arcsec slit suitable for long-slit spectroscopy. CRIRES+ dramatically enhances the instrument’s observing efficiency, and opens new scientific opportunities. These include high-precision radial-velocity studies on the 3 m/s level to characterize extra-solar planets and their athmospheres, which demand for specialized, highly accurate wavelength calibration techniques. In this paper, we present a newly developed absorption gas-cell to enable high-precision wavelength calibration for CRIRES+. We also discuss the strategies and developments to cover the full operational spectral range (1 − 5 μµm), employing cathode emission lamps, Fabry-Perot etalons, and absorption gas-cells.

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U. Seemann, G. Anglada-Escude, D. Baade, P. Bristow, R. J. Dorn, R. Follert, D. Gojak, J. Grunhut, A. P. Hatzes, U. Heiter, D. J. Ives, P. Jeep, Y. Jung, H.-U. Käufl, F. Kerber, B. Klein, J.-L. Lizon, M. Lockhart, T. Löwinger, T. Marquart, E. Oliva, J. Paufique, N. Piskunov, Eszter Pozna, A. Reiners, A. Smette, J. Smoker, E. Stempels, and E. Valenti "Wavelength calibration from 1-5μm for the CRIRES+ high-resolution spectrograph at the VLT", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91475G (6 August 2014); https://doi.org/10.1117/12.2056668

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