Coronagraphy robust to segmented aberrations: low-wind effect mitigation on Subaru/SCExAO

Lucie Leboulleux; Olivier Guyon; Julien Lozi; Miles Lucas; Sébastien Vievard; Vincent Deo; Kyohoon Ahn; Alexis Carlotti; Alain Delboulbé; Mamadou N'Diaye; Marie-Hélène Sztefek; Philippe Delorme

doi:10.1117/12.3019775

27 August 2024 Coronagraphy robust to segmented aberrations: low-wind effect mitigation on Subaru/SCExAO

Lucie Leboulleux, Olivier Guyon, Julien Lozi, Miles Lucas, Sébastien Vievard, Vincent Deo, Kyohoon Ahn, Alexis Carlotti, Alain Delboulbé, Mamadou N'Diaye, Marie-Hélène Sztefek, Philippe Delorme

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 130973G (2024) https://doi.org/10.1117/12.3019775
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

Low-wind effect is a strong limitation to direct imaging of exoplanets from ground-based telescopes, such as the Subaru telescope, the Very Large Telescope and probably the future extremely large telescopes. To mitigate it, we propose to design coronagraphs passively robust to low-wind effect. The Redundant Apodized Pupils (RAPs) are built so each pupil petal independently contributes to the contrast and therefore petal-level errors do not impact the final coronagraphic image, up to the loss of coherence in the star image. In this paper, we present the first experimental validation of the RAP concept, which is now applied on the Subaru/SCExAO instrument. We have designed three RAPs: two for the infrared channel (CHARIS) and one for the visible instrument (VAMPIRES). After these designs having been set up on the instrument in September 2023, we conducted internal source tests and obtained a contrast robustness up to a few radians. After this first experimental application, the RAP technology will be adapted, at higher contrasts (10⁻⁸-10⁻⁹), to segment-level errors, one of the main limitations for space segmented telescopes like the Habitable Worlds Observatory.

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Lucie Leboulleux, Olivier Guyon, Julien Lozi, Miles Lucas, Sébastien Vievard, Vincent Deo, Kyohoon Ahn, Alexis Carlotti, Alain Delboulbé, Mamadou N'Diaye, Marie-Hélène Sztefek, and Philippe Delorme "Coronagraphy robust to segmented aberrations: low-wind effect mitigation on Subaru/SCExAO", Proc. SPIE 13097, Adaptive Optics Systems IX, 130973G (27 August 2024); https://doi.org/10.1117/12.3019775

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KEYWORDS

Coronagraphy

Telescopes

Design

Large telescopes

Exoplanets

Wavefront aberrations

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