Precise calibration of the brighter-fatter effect in the JWST/NIRISS detector

Benjamin J. S. Pope; Louis C. Desdoigts; Peter G. Tuthill; Dori Blakely

doi:10.1117/12.3020027

28 August 2024 Precise calibration of the brighter-fatter effect in the JWST/NIRISS detector

Benjamin J. S. Pope, Louis C. Desdoigts, Peter G. Tuthill, Dori Blakely

Author Affiliations +

Proceedings Volume PC13103, X-Ray, Optical, and Infrared Detectors for Astronomy XI; PC131030K (2024) https://doi.org/10.1117/12.3020027
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

Charge migration in infrared detectors such as in JWST leads to a 'brighter-fatter effect', where photoelectrons from bright pixels spill to nearby faint pixels and blur the pixel response function at its finest spatial scales - a limiting noise floor for high angular resolution astronomy. We demonstrate an effective forwards model: a nonlinear convolution predicting the effect on every pixel as a polynomial of the pixels in its neighbourhood, learning the coefficients by gradient descent together with a differentiable model of the point spread function. We apply this to the JWST/NIRISS Aperture Masking Interferometer, inferring an accurate model for the BFE in NIRISS; overcoming the main barrier to precise interferometric observations with JWST; and illustrating a simple path to high-quality BFE calibration in other JWST instruments and infrared detectors in general.

Conference Presentation

Citation Download Citation

Benjamin J. S. Pope, Louis C. Desdoigts, Peter G. Tuthill, and Dori Blakely "Precise calibration of the brighter-fatter effect in the JWST/NIRISS detector", Proc. SPIE PC13103, X-Ray, Optical, and Infrared Detectors for Astronomy XI, PC131030K (28 August 2024); https://doi.org/10.1117/12.3020027

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