The in-flight noise performance of the JWST/NIRSpec detector system

Stephan M. Birkmann; Giovanna Giardino; Marco Sirianni; Pierre Ferruit; Bernhard Rauscher; Catarina Alves de Oliveira; Torsten Böker; Nimisha Kumari; Nora Lützgendorf; Elena Manjavacas; Charles Proffitt; Timothy D. Rawle; Maurice te Plate; Peter Zeidler

doi:10.1117/12.2629545

27 August 2022 The in-flight noise performance of the JWST/NIRSpec detector system

Stephan M. Birkmann, Giovanna Giardino, Marco Sirianni, Pierre Ferruit, Bernhard Rauscher, Catarina Alves de Oliveira, Torsten Böker, Nimisha Kumari, Nora Lützgendorf, Elena Manjavacas, Charles Proffitt, Timothy D. Rawle, Maurice te Plate, Peter Zeidler

Author Affiliations +

Proceedings Volume 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave; 121802P (2022) https://doi.org/10.1117/12.2629545
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

The Near-Infrared Spectrograph (NIRSpec) is one the four focal plane instruments on the James Webb Space Telescope (JWST) which was launched on December 25, 2021. We present the in-flight status and performance of NIRSpec’s detector system as derived from the instrument commissioning data as available at the time of the conference. The instrument features two 2048 × 2048 HAWAII-2RG sensor chip assemblies (SCAs) that are operated at a temperature of about 42.8 K and are read out via a pair of SIDECAR ASICs. NIRSpec supports “Improved Reference Sampling and Subtraction” (IRS2) readout mode that was designed to meet NIRSpec’s stringent noise requirements and to reduce 1/f and correlated noise. In addition, NIRSpec features subarrays optimized for bright object time series observations, e.g. for the observation of exoplanet transit around bright host stars. We focus on the dark signal as well as the read and total noise performance of the detectors.

Conference Presentation

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Stephan M. Birkmann, Giovanna Giardino, Marco Sirianni, Pierre Ferruit, Bernhard Rauscher, Catarina Alves de Oliveira, Torsten Böker, Nimisha Kumari, Nora Lützgendorf, Elena Manjavacas, Charles Proffitt, Timothy D. Rawle, Maurice te Plate, and Peter Zeidler "The in-flight noise performance of the JWST/NIRSpec detector system", Proc. SPIE 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, 121802P (27 August 2022); https://doi.org/10.1117/12.2629545

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