CRIRES, the ESO high resolution infrared spectrometer, is a unique instrument which allows astronomers to access a parameter space which up to now was largely uncharted. In its current setup, it consists of a single-order spectrograph providing long-slit, single-order spectroscopy with resolving power up to R=100,000 over a quite narrow spectral range. This has resulted in sub-optimal efficiency and use of telescope time for all the scientific programs requiring broad spectral coverage of compact objects (e.g. chemical abundances of stars and intergalactic medium, search and characterization of extra-solar planets). To overcome these limitations, a consortium was set-up for upgrading CRIRES to a cross-dispersed spectrometer, called CRIRES+. This paper presents the updated optical design of the crossdispersion module for CRIRES+. This new module can be mounted in place of the current pre-disperser unit. The new system yields a factor of >10 increase in simultaneous spectral coverage and maintains a quite long slit (10"), ideal for observations of extended sources and for precise sky-background subtraction.
@article{arxiv.1407.3057,
title = {Concept and optical design of the cross-disperser module for CRIRES+},
author = {E. Oliva and A. Tozzi and D. Ferruzzi and L. Origlia and A. Hatzes and R. Follert and T. Loewinger and N. Piskunov and U. Heiter and M. Lockhart and T. Marquart and E. Stempels and A. Reiners and G. Anglada-Escude and U. Seemann and R. J. Dorn and P. Bristow and D. Baade and B. Delabre and D. Gojak and J. Grunhut and B. Klein and M. Hilker and D. J. Ives and Y. Jung and H. U. Kaeufl and F. Kerber and J. L. Lizon and L. Pasquini and J. Paufique and E. Pozna and A. Smette and J. Smoker and E. Valenti},
journal= {arXiv preprint arXiv:1407.3057},
year = {2015}
}
Comments
14 pages, 9 figures, 22 tables. Presented at SPIE Astronomical Telescope + Instrumentation 2014 (Ground-based and Airbone Instrumentation for Astronomy 5, 9147-289). To be published in Proceeding of SPIE Volume 9147