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Lyot-plane phase masks for improved high-contrast imaging with a vortex coronagraph

Ruane, G. J. and Huby, E. and Absil, O. and Mawet, D. and Delacroix, C. and Carlomagno, B. and Swartzlander, G. A. (2015) Lyot-plane phase masks for improved high-contrast imaging with a vortex coronagraph. Astronomy and Astrophysics, 583 . Art. No. A81. ISSN 0004-6361. doi:10.1051/0004-6361/201526561.

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Context. The vortex coronagraph is an optical instrument that precisely removes on-axis starlight allowing for high contrast imaging at small angular separation from the star, a crucial capability for direct detection and characterization of exoplanets and circumstellar disks. Telescopes with aperture obstructions, such as secondary mirrors and spider support structures, require advanced coronagraph designs to provide adequate starlight suppression. Aims. We introduce a phase-only Lyot-plane optic to the vortex coronagraph, which offers improved contrast performance on telescopes with complicated apertures. Potential solutions for the European Extremely Large Telescope (E-ELT) are described. Methods. Adding a Lyot-plane phase mask relocates residual starlight away from a region of the image plane, thereby reducing stellar noise and improving sensitivity to off-axis companions. The phase mask is calculated using an iterative phase retrieval algorithm. Results. Numerically, we achieve a contrast on the order of 10-6 for a companion with angular displacement as small as 4λ/D with an E-ELT type aperture. Even in the presence of aberrations, improved performance is expected compared to either a conventional vortex coronagraph or an optimized pupil plane phase element alone.

Item Type:Article
Related URLs:
URLURL TypeDescription
Ruane, G. J.0000-0003-4769-1665
Absil, O.0000-0002-4006-6237
Mawet, D.0000-0002-8895-4735
Additional Information:© ESO, 2015. Received 19 May 2015 / Accepted 18 September 2015 / Published online 30 October 2015. This work has benefited from fruitful discussions with Prof. Jean Surdej (Université de Liège, Belgium) and Prof. Matt Kenworthy (Leiden Observatory, Netherlands) as well as computing assistance from Carlos Gomez Gonzalez (Université de Liège, Belgium). G.J.R. was supported by Wallonie-Bruxelles International’s (Belgium) Scholarship for Excellence and the US National Science Foundation under Grant No. ECCS-1309517. The research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Programme (ERC Grant Agreement No. 337569) and from the French Community of Belgium through an ARC grant for Concerted Research Action.
Funding AgencyGrant Number
Wallonie-Bruxelles InternationalUNSPECIFIED
European Research Council (ERC)337569
Fonds de la Recherche Scientifique (FNRS)UNSPECIFIED
Actions de Recherche Concertees (Communauté Française de Belgique)UNSPECIFIED
Subject Keywords:instrumentation: high angular resolution / planets and satellites: detection
Record Number:CaltechAUTHORS:20151218-115212953
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Official Citation:Lyot-plane phase masks for improved high-contrast imaging with a vortex coronagraph G. J. Ruane, E. Huby, O. Absil, D. Mawet, C. Delacroix, B. CarlomagnoG. J. Ruane, E. Huby, O. Absil, D. Mawet, C. Delacroix, B. Carlomagno and G. A. Swartzlander A&A, 583 (2015) A81 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63076
Deposited By: George Porter
Deposited On:18 Dec 2015 23:52
Last Modified:10 Nov 2021 23:11

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