Physics
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007lyot.confe..50m&link_type=abstract
Proceedings of the conference In the Spirit of Bernard Lyot: The Direct Detection of Planets and Circumstellar Disks in the 21s
Physics
Scientific paper
The James Webb Space Telescope (JWST) - a segmented-aperture 6.5 m class observatory that will orbit the second Sun-Earth Lagrange point - will provide unique imaging and spectroscopic capabilities for wavelengths ranging from the optical (0.70µm) to the mid-infrared (28µm). To take advantage of JWST's unprecedented sensitivity, the Near Infrared Camera (NIRCam), the Fine Guidance Sensor Tunable Filter Imager (FGS-TFI), and the Mid-Infrared Imager (MIRI) have been designed with coronagraphic capabilities, making use of band-limited occulting masks or Four Quadrant Phase Masks to provide high contrast imaging at Near Infrared or Mid-Infrared wavelengths. While JWST is expected to provide an extremely stable observing platform, thermal variations arising from typical telescope slews will undoubtedly affect the phasing of the primary mirror's segments, thereby reducing the quality of the PSF presented to the coronagraphic imagers. Here we discuss some of the observational and operational challenges facing JWST's coronagraphs, and present some of the techniques currently envisioned to mitigate those challenges.
Friedman Scott
Fullerton Alex
Makidon Russell
Mountain Matt
Stefano C.
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