The NIR Spectrograph for the new SOXS instrument at the NTT

TL;DR

The paper describes the design and expected performance of the NIR spectrograph component of the SOXS instrument for the ESO-NTT telescope, covering 0.80-2.00 μm with high resolution and cryogenic cooling.

Contribution

It introduces the fully cryogenic, high-resolution NIR spectrograph for SOXS, detailing its design, components, and expected observational capabilities.

Findings

Spectrograph covers 0.80-2.00 μm wavelength range.

Achieves a mean spectral resolution of R~4,500.

Designed for optimal performance at the ESO-NTT telescope.

Abstract

We present the NIR spectrograph of the Son Of XShooter (SOXS) instrument for the ESO-NTT telescope at La Silla (Chile). SOXS is a R~4,500 mean resolution spectrograph, with a simultaneously coverage from about 0.35 to 2.00 {\mu}m. It will be mounted at the Nasmyth focus of the NTT. The two UV-VIS-NIR wavelength ranges will be covered by two separated arms. The NIR spectrograph is a fully cryogenic echelle-dispersed spectrograph, working in the range 0.80-2.00 {\mu}m, equipped with an Hawaii H2RG IR array from Teledyne, working at 40 K. The spectrograph will be cooled down to about 150 K, to lower the thermal background, and equipped with a thermal filter to block any thermal radiation above 2.0 {\mu}m. In this poster we will show the main characteristics of the instrument along with the expected performances at the telescope.