ANDES, the high resolution spectrograph for the ELT: the front-end and its seeing limited arms

Alexandre Cabral; Bachar Wehbé; Manuel Abreu; Matteo Aliverti; Manuel Monteiro; João Coelho; Alessio Zanutta; Edoardo Redaelli; Ernesto Oliva; Paolo Di Marcantonio; Nuno Santos; Alessandro Marconi

doi:10.1117/12.3019808

18 July 2024 ANDES, the high resolution spectrograph for the ELT: the front-end and its seeing limited arms

Alexandre Cabral, Bachar Wehbé, Manuel Abreu, Matteo Aliverti, Manuel Monteiro, João Coelho, Alessio Zanutta, Edoardo Redaelli, Ernesto Oliva, Paolo Di Marcantonio, Nuno Santos, Alessandro Marconi

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130964C (2024) https://doi.org/10.1117/12.3019808
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

ANDES is a high-resolution spectrograph to me mounted on one of the Nasmyth foci of the ESO Extremely Large Telescope in Chile. This instrument will be composed of (at least) three spectrographs to cover a high spectral range: one for the BV-band, one for the RIZ-band, and one for the YJH band. ANDES will provide a spectral resolution of ∼100,000 with a minimum simultaneous wavelength coverage of 0.4-1.8 μm with the goal of extending it to 0.35-2.4 μm with the addition of a K-band spectrograph. To stabilize and inject the light coming from the telescope into the different spectrographs a Front-End will be installed on the Nasmyth platform. The key functions of the Front-End are to support the different sub-units (arms) at the Nasmyth focus, to provide selection of the different observing modes, to allow sky subtraction during observations, and to manage fibre bundles and cables. The Front-End comprises three different arms (two Seeing Limited Arms for object and sky subtraction, a Single Conjugate Adaptive Optics and an Integral Field Unit) and is connected to the spectrographs via a Fibre Link, that also provides the interfaces with the Calibration Unit. As for the seeing limited arms, their key functions are to separate each spectrograph spectral band, provide atmospheric dispersion correction, guiding and field stabilization, and to allow calibration light injection. In this paper, the preliminary design of the ANDES Front-End will be presented. The preliminary optical and optomechanical design of the seeing limited arms will also be detailed.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Alexandre Cabral, Bachar Wehbé, Manuel Abreu, Matteo Aliverti, Manuel Monteiro, João Coelho, Alessio Zanutta, Edoardo Redaelli, Ernesto Oliva, Paolo Di Marcantonio, Nuno Santos, and Alessandro Marconi "ANDES, the high resolution spectrograph for the ELT: the front-end and its seeing limited arms", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130964C (18 July 2024); https://doi.org/10.1117/12.3019808

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