Paper 13103-80
Paper 13103-80
Holistic understanding of the JWST-MIRI detector PSF using physical optics propagation
17 June 2024 • 17:30 - 19:00 Japan Standard Time | Room G5, North - 1F
Abstract
The Mid-Infrared Instrument (MIRI), on-board the James Webb Space Telescope (JWST), was designed to produce a diffraction-limited Point Spread Function (PSF) at the detector image plane in the 5-28 micron wavelength range. For the MIRI Medium-Resolution Spectrometer (MRS), a PSF broadening of 60% down to 10% is observed in the 5-28 micron range. Additionally, 20% of the light is scattered into the wings as an extended component on the detector. The same PSF systematics manifest in the MIRI Imager and Low-Resolution Spectrometer (LRS) data. We use physical optics propagation to propagate a uniform wavefront from the JWST pupil to the MIRI Imager detector plane. The camera F-number and variation of incidence angle across the detector allow us to reproduce the systematics and an observed bending in the extended component, across the detector. This is a significant leap for PSF-weighted photometry. The model can be extended to the LRS and MRS.
Presenter
KU Leuven (Belgium)
Dr. Ioannis ("Yannis") Argyriou is an instrument scientist for the Mid-Infrared Instrument MIRI on board the James Webb Space Telescope. Yannis received his Ph.D. degree in Astronomy and Astrophysics from KU Leuven, in Belgium, on the topic of "Calibration of MIRI on board JWST". His work revolves on understanding instrumental effects and their impact on the science, as well as modelling these effects with the goal of removing them from the data. His work involves studying complex electronic and optical effects, as well as developing new data extraction methods that would give the best 2D images and spectra to the astronomical community. Yannis supported the JWST mission-critical commissioning phase. Now a post-doctoral researcher at KU Leuven, he is applying the tools and methodologies defined during his Ph.D., as well as the knowledge acquired during MIRI commissioning, cycle 1, and cycle 2 calibration, supporting many exciting JWST science programs.