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Peculiarity of Lyot Coronagraphy for Highly Segmented Apertures

Published online by Cambridge University Press:  13 October 2006

M. Carbillet ,
A. Ferrari ,
C. Aime  and
N. Yaitskova
N. Yaitskova*
Affiliation:
European Southern Observatory, Karl Schwarzschildstr. 2, 85748 Garching bei Muenchen, Germany
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Abstract

The existing high contrast imaging techniques cannot be applieddirectly to the telescope of the diameter 30–100 m without takinginto account the specific characteristics of a segmented surface.While the increase in telescope diameter is an advantage for thehigh contrast range science, the segmentation sets a limit on theperformance of the coronagraph. In particular, diffraction fromintersegment gaps sets a floor to the achievable extinction of thestarlight. Masking out the gaps in the Lyot plane although helpsincreasing the contrast, does not solve completely the problem: thehigh spatial frequency component of the diffractive light remains.In the paper I suggest using a Lyot stop which produces aphase-amplitude modulation in order to reduce the effect ofsegmentation.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 22: Astronomy with High Contrast Imaging III: Instrumental Techniques, Modeling and Data Processing , 2006 , pp. 223 - 237
Copyright
© EAS, EDP Sciences, 2006

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