Differentiable modelling and data analysis for the JWST Aperture Masking Interferometer

Paper

Desdoigts, Louis, Pope, Benjamin and Tuthill, Peter. 2024. "Differentiable modelling and data analysis for the JWST Aperture Masking Interferometer." SPIE Astronomical Telescopes + Instrumentation 2024. Yokohama, Japan 16 - 21 Jun 202 United States. SPIE. https://doi.org/10.1117/12.3020303
Paper/Presentation Title

Differentiable modelling and data analysis for the JWST Aperture Masking Interferometer

Presentation TypePaper
AuthorsDesdoigts, Louis, Pope, Benjamin and Tuthill, Peter
Journal or Proceedings TitleProceedings of SPIE (International Society for Optical Engineering)
Journal Citation13095
Number of Pages9
Year2024
PublisherSPIE
Place of PublicationUnited States
ISSN0277-786X
ISBN9781510675131
Digital Object Identifier (DOI)https://doi.org/10.1117/12.3020303
Web Address (URL) of Paperhttps://www.spiedigitallibrary.org/conference-proceedings-of-spie/13095/3020303/Differentiable-modelling-and-data-analysis-for-the-JWST-Aperture-Masking/10.1117/12.3020303.short
Web Address (URL) of Conference Proceedingshttps://www.spiedigitallibrary.org/conference-proceedings-of-spie/13095.toc
Conference/EventSPIE Astronomical Telescopes + Instrumentation 2024
Event Details
SPIE Astronomical Telescopes + Instrumentation 2024
Parent
SPIE Astronomical Telescopes + Instrumentation
Delivery
In person
Event Date
16 to end of 21 Jun 0202
Event Location
Yokohama, Japan
AbstractThe Aperture Masking Interferometer (AMI) on board the James Webb Space Telescope (JWST) has a unique place in observational astronomy as the first imaging interferometer in space, promising highly-precise observations resistant to optical aberrations. While the optical system and Point-Spread Function (PSF) are very stable, the infrared detectors on board suffer from a series of non-linearities – primarily charge migration or the “brighter-fatter effect” that, while challenging for other observing modes, are ruinous to the visibility calibration of the AMI mode. Local nonlinear effects produced cannot be straightforwardly corrected in the Fourier domain. Efforts using the existing pipelines have delivered some improvements, but outcomes remain far from the theoretical photon-noise limit of the instrument. This manuscript presents initial work using a fundamentally different approach: the joint implementation of a differentiable physics model of the optics, and a machine-learned Effective Detector Model (EDM), using dLux. These are trained together end-to-end, by gradient descent using the full ensemble of point-source reference targets so far observed by AMI. We infer highly-precise metrology of the AMI and NIRISS optical systems, a preliminary EDM which restores commissioning data to near-ideal precision, and illustrate initial and final residual noise floors representing the present state of this ongoing project.
KeywordsAMI; James Webb Space Telescope; JWST; aperture masking interferometer; Optics; Modelling; Physical Optics; Data Analysis
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 20205101. Astronomical sciences
Public Notes

© 2024 Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.

Byline AffiliationsUniversity of Sydney
University of Southern Queensland
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