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Wavefront error tolerancing for direct imaging of exo-Earths with a large segmented telescope in space
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Paper Abstract

Direct imaging of exo-Earths and search for life is one of the most exciting and challenging objectives for future space observatories. Segmented apertures in space will be required to reach the needed large diameters beyond the capabilities of current or planned launch vehicles. These apertures present additional challenges for high-contrast coronagraphy, not only in terms of static phasing but also in terms of their stability. The Pair-based Analytical model for Segmented Telescope Imaging from Space (PASTIS) was developed to model the effects of segment-level optical aberrations on the final image contrast. In this paper, we extend the original PASTIS propagation model from a purely analytical to a semi-analytical method, in which we substitute the use of analytical images with numerically simulated images. The inversion of this model yields a set of orthonormal modes that can be used to determine segment-level wavefront tolerances. We present results in the case of segment-level piston error applied to the baseline coronagraph design of LUVOIR A, with minimum and maximum wavefront error constraint between 56 pm and 290 pm per segment. The analysis is readily generalizable to other segment-level aberrations modes, and can also be expanded to establish stability tolerances for these missions.

Paper Details

Date Published: 9 September 2019
PDF: 15 pages
Proc. SPIE 11117, Techniques and Instrumentation for Detection of Exoplanets IX, 1111717 (9 September 2019); doi: 10.1117/12.2530300
Show Author Affiliations
Iva Laginja, Space Telescope Science Institute (United States)
ONERA (France)
Lucie Leboulleux, LESIA, Observatoire de Paris, Univ. PSL (France)
Laurent Pueyo, Space Telescope Science Institute (United States)
Rémi Soummer, Space Telescope Science Institute (United States)
Jean-François Sauvage, ONERA (France)
Lab. d'Astrophysique de Marseille, Aix Marseille Univ. (France)
Laurent Mugnier, ONERA (France)
Laura E. Coyle, Ball Aerospace (United States)
J. Scott Knight, Ball Aerospace (United States)
Kathryn St. Laurent, Space Telescope Science Institute (United States)
Emiel H. Por, Leiden Observatory (Netherlands)
James Noss, Space Telescope Science Institute (United States)


Published in SPIE Proceedings Vol. 11117:
Techniques and Instrumentation for Detection of Exoplanets IX
Stuart B. Shaklan, Editor(s)

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