A comparison of solar and stellar coronagraphs that make use of external occulters

Claude Aime; Céline Theys; Simon Prunet; André Ferrari

doi:10.1117/12.3013679

23 August 2024 A comparison of solar and stellar coronagraphs that make use of external occulters

Claude Aime, Céline Theys, Simon Prunet, André Ferrari

Author Affiliations +

Proceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 130925A (2024) https://doi.org/10.1117/12.3013679
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Solar and stellar externally occulted coronagraphs share similar concepts, but are actually very different because of geometric characteristics. Solar occulters were first developed with a simple geometric model of diffraction perpendicular to the occulter edges. We apply this mere approach to starshades, and introduce a simple shifted circular integral of the occulter which allows to illustrate the influence of the number of petals on the extent of the deep central dark zone. We illustrate the reasons for the presence of an internal coronagraph in the solar case and its absence in the exoplanet case.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Claude Aime, Céline Theys, Simon Prunet, and André Ferrari "A comparison of solar and stellar coronagraphs that make use of external occulters", Proc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 130925A (23 August 2024); https://doi.org/10.1117/12.3013679

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