The Enhanced Resolution Imager and Spectrograph for the VLT
Authors: R. Davies, O. Absil, G. Agapito, A. Agudo Berbel, A. Baruffolo, V. Biliotti, M. Bonaglia, M. Bonse, R. Briguglio, P. Campana, Y. Cao, L. Carbonaro, A. Cortes, G. Cresci, Y. Dallilar, F. Dannert, R. J. De Rosa, M. Deysenroth, I. Di Antonio, A. Di Cianno, G. Di Rico, D. Doelman, M. Dolci, R. Dorn, F. Eisenhauer, S. Esposito, D. Fantinel, D. Ferruzzi, H. Feuchtgruber, N. M. Förster Schreiber, X. Gao, H. Gemperlein, R. Genzel, S. Gillessen, C. Ginski, A. M. Glauser, A. Glindemann, P. Grani, M. Hartl, J. Hayoz, M. Heida, D. Henry, H. Huber, M. Kasper, C. Keller, M. Kenworthy, K. Kravchenko, H. Kuntschner, S. Lacour, J. Lightfoot, D. Lunney, M. Macintosh, F. Mannucci, M. Marsset, A. Modigliani, M. Neeser, G. Orban de Xivry, L. Pallanca, P. Patapis, D. Pearson, E. Peña, I. Percheron, A. Puglisi, S. P. Quanz, C. Rau, A. Riccardi, B. Salasnich, H. -M. Schmid, B. Serra, F. Snik, E. Sturm, W. Taylor, A. Valentini, C. Waring, E. Wiezorrek, M. Xompero
Abstract: ERIS, the Enhanced Resolution Imager and Spectrograph, is an instrument that both extends and enhances the fundamental diffraction limited imaging and spectroscopy capability for the VLT. It replaces two instruments that were being maintained beyond their operational lifetimes, combines their functionality on a single focus, provides a new wavefront sensing module for natural and laser guide stars that makes use of the Adaptive Optics Facility, and considerably improves on their performance. The observational modes ERIS provides are integral field spectroscopy at 1-2.5 {\mu}m, imaging at 1-5 {\mu}m with several options for high contrast imaging, and longslit spectroscopy at 3-4 {\mu}m, The instrument is installed at the Cassegrain focus of UT4 at the VLT and, following its commissioning during 2022, has been made available to the community.
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