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Detecting and characterizing the atmospheres of terrestrial exoplanets is a primary goal of the proposed nextgeneration IR/O/UV mission recommended by Astro2020 decadal survey. Achieving this goal with direct imaging depends critically on developing coronagraph technology that maximizes the exoEarth yield. Stringent tradeoffs between low-order aberration sensitivity, inner working angle, and throughput have been one of the main limiting factors affecting the yield of coronagraph technologies for telescopes with complex apertures. We present preliminary hybrid PIAA-vortex coronagraph designs for obstructed apertures. PIAA-vortex designs can be used to close the yield gap between on-axis and off-axis telescopes, which in turn has the potential to translate to significant yield gains for future space missions. In our forthcoming publication, we will present further analysis of the PIAA-vortex along with the formalism for optimizing 2-D mirror shapes in the geometric-optics regime.
Kevin Fogarty,Rus Belikov,Dan Sirbu, andEugene Pluzhnik
"The PIAA-vortex coronagraph: a new coronagraph technology to maximize exo-Earth yields in the Astro2020 era", Proc. SPIE 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, 1218028 (27 August 2022); https://doi.org/10.1117/12.2630638
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Kevin Fogarty, Rus Belikov, Dan Sirbu, Eugene Pluzhnik, "The PIAA-vortex coronagraph: a new coronagraph technology to maximize exo-Earth yields in the Astro2020 era," Proc. SPIE 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, 1218028 (27 August 2022); https://doi.org/10.1117/12.2630638