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A ground-based study for the 4Q coronagraph

Published online by Cambridge University Press:  28 May 2003

P. Riaud
Affiliation:
LISE-Observatoire de Haute-Provence, 04870 St Michel l'Observatoire, France LESIA, Observatoire de Paris-Meudon, 5 Pl. J. Janssen, 92195 Meudon, France
A. Boccaletti
Affiliation:
LESIA, Observatoire de Paris-Meudon, 5 Pl. J. Janssen, 92195 Meudon, France
J. Baudrand
Affiliation:
LESIA, Observatoire de Paris-Meudon, 5 Pl. J. Janssen, 92195 Meudon, France
D. Rouan
Affiliation:
LESIA, Observatoire de Paris-Meudon, 5 Pl. J. Janssen, 92195 Meudon, France
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Abstract

High angular resolution provided by adaptive optics on ground-based telescopes allows detailed study of bright starsenvironment. The limitation of dectability of faint companions isthe diffracted light from the star. The 4Q coronagraph(Rouan et al. 2000; Riaud et al. 2001; Abe et al. 2001) decreases this diffracted haloand provides high contrast imaging. The residual speckle patternbecomes the final limitation for the coronagraphic observations.We present here, a complete study of the 4Q coronagraph in usewith an high order adaptive optics on the VLT telescope, withinthe context of "Planet Finder" ESO project. Practically, a simplesolution making use of commercial half waveplates seems wellsuited for a ground-based coronagraphic device.

Type
Research Article
Copyright
© EAS, EDP Sciences, 2003

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