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Adaptive Mask coronagraph

Published online by Cambridge University Press:  02 May 2006

P. Bourget ,
R. Vieira Martins ,
F. Colas ,
P. Assus  and
A. Irbah
P. Bourget
Affiliation:
Service d'Aéronomie-CNRS-Verrières le Buisson, France. email: pierre@aerov.jussieu.fr Observatório Nacional do Rio de Janeiro - MCT - Brazil.
R. Vieira Martins
Affiliation:
Observatório Nacional do Rio de Janeiro - MCT - Brazil.
F. Colas
Affiliation:
IMCCE, Paris.
P. Assus
Affiliation:
Observatoire de Nice-OCA.
A. Irbah
Affiliation:
Service d'Aéronomie-CNRS-Verrières le Buisson, France. email: pierre@aerov.jussieu.fr
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Abstract

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In this paper, the new coronagraph that will be mounted at the Pic du Midi Observatory (IMCCE - T1m telescope) is presented. To optimize the occulting process of a Lyot coronagraph, a compressed mercury (Hg) drop is used as an occulting disk and its size control offers an adaptation to the seeing conditions or to the Airy diameter fraction needed. In addition to the Hg-mask, a variation on the theme is proposed by a diameter and wavelength adaptive phase mask made of a gas bubble in immersion oil between two optical windows. The instrument concept offers a good versatility to test other mask type and pupil apodization techniques.

Keywords

Instrumentation: coronagraphtechniques: interferometryplanets and satellites: astrometrystars: planetary systems:protoplanetary disks