| Issue |
EAS Publications Series
Volume 8, 2003
Astronomy with High Contrast Imaging
|
|
|---|---|---|
| Page(s) | 201 - 207 | |
| DOI | https://doi.org/10.1051/eas:2003062 | |
| 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
1
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