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A Visible-light Lyot Coronagraph for SCExAO/VAMPIRES

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arxiv 2208.02380 v1 pith:TKHMXYN7 submitted 2022-08-03 astro-ph.IM

Miles Lucas , Michael Bottom , Olivier Guyon , Julien Lozi , Barnaby Norris , Vincent Deo , Sebastien Vievard , Kyohoon Ahn
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Nour Skaf Peter Tuthill
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keywords coronagraphlyotdesignscexaovampiresvisible-lightanglesavailable
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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 1e-2 at 0.1" to 1e-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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