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Ring-apodized Vortex Coronagraphs for Obscured Telescopes. I. Transmissive Ring Apodizers

Mawet, D. and Pueyo, L. and Carlotti, A. and Mennesson, B. and Serabyn, E. and Wallace, J. K. (2013) Ring-apodized Vortex Coronagraphs for Obscured Telescopes. I. Transmissive Ring Apodizers. Astrophysical Journal Supplement Series, 209 (1). Art. No. 7. ISSN 0067-0049. doi:10.1088/0067-0049/209/1/7.

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The vortex coronagraph (VC) is a new generation small inner working angle (IWA) coronagraph currently offered on various 8 m class ground-based telescopes. On these observing platforms, the current level of performance is not limited by the intrinsic properties of actual vortex devices, but by wavefront control residuals and incoherent background (e.g., thermal emission of the sky), or the light diffracted by the imprint of the secondary mirror and support structures on the telescope pupil. In the particular case of unfriendly apertures (mainly large central obscuration) when very high contrast is needed (e.g., direct imaging of older exoplanets with extremely large telescopes or space-based coronagraphs), a simple VC, like most coronagraphs, cannot deliver its nominal performance because of the contamination due to the diffraction from the obscured part of the pupil. Here, we propose a novel yet simple concept that circumvents this problem. We combine a vortex phase mask in the image plane of a high-contrast instrument with a single pupil-based amplitude ring apodizer, tailor-made to exploit the unique convolution properties of the VC at the Lyot-stop plane. We show that such a ring-apodized vortex coronagraph (RAVC) restores the perfect attenuation property of the VC regardless of the size of the central obscuration, and for any (even) topological charge of the vortex. More importantly, the RAVC maintains the IWA and conserves a fairly high throughput, which are signature properties of the VC.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle Paper
Mawet, D.0000-0002-8895-4735
Pueyo, L.0000-0003-3818-408X
Mennesson, B.0000-0003-4205-4800
Additional Information:© 2013 American Astronomical Society. Received 2013 July 1; accepted 2013 September 5; published 2013 October 21. This work was carried out at the European Southern Observatory (ESO) and at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This material is partially based on work supported by NASA under grant NNX12AG05G issued through the Astrophysics Research and Analysis (APRA) program.
Funding AgencyGrant Number
Subject Keywords:brown dwarfs – instrumentation: adaptive optics – instrumentation: high angular resolution – stars: imaging – stars: low-mass – techniques: high angular resolution – telescopes
Issue or Number:1
Record Number:CaltechAUTHORS:20150526-100126063
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Official Citation:Ring-apodized Vortex Coronagraphs for Obscured Telescopes. I. Transmissive Ring Apodizers D. Mawet et al. 2013 ApJS 209 7
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57803
Deposited By: Tony Diaz
Deposited On:27 May 2015 19:09
Last Modified:10 Nov 2021 21:55

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