EAS Publications Series
Volume 8, 2003Astronomy with High Contrast Imaging
|Page(s)||201 - 207|
|Published online||28 May 2003|
Claude Aime and Rémi Soummer (eds)
EAS Publications Series, 8 (2003) 201-207
A ground-based study for the 4Q coronagraph
LISE-Observatoire de Haute-Provence, 04870 St Michel l'Observatoire, France
2 LESIA, Observatoire de Paris-Meudon, 5 Pl. J. Janssen, 92195 Meudon, France
High angular resolution provided by adaptive optics on ground-based telescopes allows detailed study of bright stars environment. The limitation of dectability of faint companions is the diffracted light from the star. The 4Q coronagraph (Rouan et al. 2000; Riaud et al. 2001; Abe et al. 2001) decreases this diffracted halo and provides high contrast imaging. The residual speckle pattern becomes the final limitation for the coronagraphic observations. We present here, a complete study of the 4Q coronagraph in use with an high order adaptive optics on the VLT telescope, within the context of "Planet Finder" ESO project. Practically, a simple solution making use of commercial half waveplates seems well suited for a ground-based coronagraphic device.
© EAS, EDP Sciences, 2003
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