16 September 2015 Astrometric accuracy of aperture making interferometry with JWST-NIRISS
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Abstract
JWST/NIRISS has a non-redundant aperture mask (NRM) for use with its F380M, F430M, F480M and F277W filters. In addition to high-resolution imaging with moderate contrast, the NRM provides better astrometric accuracy over a wide field of view than regular imaging. We investigate the accuracy achievable with the NRM by using an image-plane algorithm to analyze the PSFs of a point source that were obtained at a fixed pixel location with sub-pixel dithers during the second Cryo-Vacuum test campaign of the Integrated Science Instrument Module at NASA’s Goddard Space Flight Center. Astrometry of brown dwarfs with the NRM will be sensitive to the presence of terrestrial planets and can be used to probe the architecture of planetary systems around these objects.
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Deepashri Thatte, Alexandra Greenbaum, André Martel, Anand Sivaramakrishnan, and Étienne Artigau "Astrometric accuracy of aperture making interferometry with JWST-NIRISS", Proc. SPIE 9605, Techniques and Instrumentation for Detection of Exoplanets VII, 96052F (16 September 2015); doi: 10.1117/12.2188543; https://doi.org/10.1117/12.2188543
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