A visible-light Lyot coronagraph for SCExAO/VAMPIRES

Miles Lucas; Michael Bottom; Olivier Guyon; Julien Lozi; Barnaby Norris; Vincent Deo; Sébastien Vievard; Kyohoon Ahn; Nour Skaf; Peter Tuthill

doi:10.1117/12.2632269

29 August 2022 A visible-light Lyot coronagraph for SCExAO/VAMPIRES

Miles Lucas, Michael Bottom, Olivier Guyon, Julien Lozi, Barnaby Norris, Vincent Deo, Sébastien Vievard, Kyohoon Ahn, Nour Skaf, Peter Tuthill

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 121844E (2022) https://doi.org/10.1117/12.2632269
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

We describe the design and initial results from a visible-light Lyot coronagraph for SCExAO/VAMPIRES. The coronagraph is comprised of four hard-edged, partially transmissive focal plane masks with inner working angles of 36 mas, 55 mas, 92 mas and 129 mas, respectively. The Lyot stop is a reflective, undersized design with a geometric throughput of 65.7%. Our preliminary on-sky contrast is 10₋₂ at 0.1 ′′ to 10₋₄ at 0.75′′ for all mask sizes. The coronagraph was deployed in early 2022 and is available for open use.

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Miles Lucas, Michael Bottom, Olivier Guyon, Julien Lozi, Barnaby Norris, Vincent Deo, Sébastien Vievard, Kyohoon Ahn, Nour Skaf, and Peter Tuthill "A visible-light Lyot coronagraph for SCExAO/VAMPIRES", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121844E (29 August 2022); https://doi.org/10.1117/12.2632269

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