The Infrared Imaging Spectrograph (IRIS) for TMT: exposure time calculator for IRIS

Gregory Walth; Arun Surya; Nils-Erik Rundquist; Shelley A. Wright; Maren Cosens; Andrey Vayner; Eric Oh; Jacob A. Llamas; Warren Skidmore; Eric M. Chisholm; James E. Larkin

doi:10.1117/12.2563029

16 February 2021 The Infrared Imaging Spectrograph (IRIS) for TMT: exposure time calculator for IRIS

Gregory Walth, Arun Surya, Nils-Erik Rundquist, Shelley A. Wright, Maren Cosens, Andrey Vayner, Eric Oh, Jacob A. Llamas, Warren Skidmore, Eric M. Chisholm, James E. Larkin

Author Affiliations +

Proceedings Volume 11452, Software and Cyberinfrastructure for Astronomy VI; 1145236 (2021) https://doi.org/10.1117/12.2563029
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The IRIS Exposure Time Calculator (ETC) was designed to be a publicly available aid to the astronomical community in the development of science cases for the Infrared Imaging Spectrograph (IRIS) and future proposal planning. The IRIS ETC is developed from the IRIS simulator in which the signal-to-noise calculation is done pixel-by-pixel for 2D and 3D data. The IRIS ETC makes use of simulated Narrow Field InfraRed Adaptive Optics System (NFIRAOS) point spread functions sampling the performance at key positions across the focal plane of the IRIS imager and Integral Field Spectrograph, with varying adaptive optics performances and atmospheric conditions. Like the IRIS simulator, we model the near-infrared background with variable OH emission lines and thermal emission from the atmosphere to provide accurate noise estimates. The IRIS ETC is designed to work with the hundreds of modes given the combination of filters and grating selection. The framework, developed in Python and making use of Astropy and Photutils, can handle any 2D or 3D data input and therefore can be easily adapted for any current or future near-infrared instrument.

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Gregory Walth, Arun Surya, Nils-Erik Rundquist, Shelley A. Wright, Maren Cosens, Andrey Vayner, Eric Oh, Jacob A. Llamas, Warren Skidmore, Eric M. Chisholm, and James E. Larkin "The Infrared Imaging Spectrograph (IRIS) for TMT: exposure time calculator for IRIS", Proc. SPIE 11452, Software and Cyberinfrastructure for Astronomy VI, 1145236 (16 February 2021); https://doi.org/10.1117/12.2563029

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