Updated point spread function simulations for JWST with WebbPSF

Marshall D. Perrin; Anand Sivaramakrishnan; Charles-Philippe Lajoie; Erin Elliott; Laurent Pueyo; Swara Ravindranath; Loïc Albert

doi:10.1117/12.2056689

28 August 2014 Updated point spread function simulations for JWST with WebbPSF

Marshall D. Perrin, Anand Sivaramakrishnan, Charles-Philippe Lajoie, Erin Elliott, Laurent Pueyo, Swara Ravindranath, Loïc Albert

Author Affiliations +

Proceedings Volume 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave; 91433X (2014) https://doi.org/10.1117/12.2056689
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

Accurate models of optical performance are an essential tool for astronomers, both for planning scientific observations ahead of time, and for a wide range of data analysis tasks such as point-spread-function (PSF)-fitting photometry and astrometry, deconvolution, and PSF subtraction. For the James Webb Space Telescope, the WebbPSF program provides a PSF simulation tool in a flexible and easy-to-use software package available to the community and implemented in Python. The latest version of WebbPSF adds new support for spectroscopic modes of JWST NIRISS, MIRI, and NIRSpec, including modeling of slit losses and diffractive line spread functions. It also provides additional options for modeling instrument defocus and/or pupil misalignments. The software infrastructure of WebbPSF has received enhancements including improved parallelization, an updated graphical interface, a better configuration system, and improved documentation. We also present several comparisons of WebbPSF simulated PSFs to observed PSFs obtained using JWST's flight science instruments during recent cryovac tests. Excellent agreement to first order is achieved for all imaging modes cross-checked thus far, including tests for NIRCam, FGS, NIRISS, and MIRI. These tests demonstrate that WebbPSF model PSFs have good fidelity to the key properties of JWST's as-built science instruments.

Citation Download Citation

Marshall D. Perrin, Anand Sivaramakrishnan, Charles-Philippe Lajoie, Erin Elliott, Laurent Pueyo, Swara Ravindranath, and Loïc Albert "Updated point spread function simulations for JWST with WebbPSF", Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 91433X (28 August 2014); https://doi.org/10.1117/12.2056689

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