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Analysis of ground-based differential imager performance

Published online by Cambridge University Press:  02 May 2006

A. Boccaletti ,
D. Mouillet ,
T. Fusco ,
P. Baudoz ,
C. Cavarroc ,
J.-L. Beuzit ,
C. Moutou  and
K. Dohlen
A. Boccaletti
Affiliation:
LESIA, Observatoire de Meudon, 5 pl. J. Janssen, 92195 Meudon, France email: anthony.boccaletti@obspm.fr
D. Mouillet
Affiliation:
Observatoire Midi-Pyrénées, 57 av. d'Azereix, 65008 Tarbes, France
T. Fusco
Affiliation:
ONERA, 29 avenue de la Division Leclerc, 92320 Chatillon, France
P. Baudoz
Affiliation:
LESIA, Observatoire de Meudon, 5 pl. J. Janssen, 92195 Meudon, France email: anthony.boccaletti@obspm.fr
C. Cavarroc
Affiliation:
LESIA, Observatoire de Meudon, 5 pl. J. Janssen, 92195 Meudon, France email: anthony.boccaletti@obspm.fr
J.-L. Beuzit
Affiliation:
LAOG, Observatoire de Grenoble, 38041 Grenoble, France
C. Moutou
Affiliation:
LAM, Traverse du Siphon, 13376 Marseille, France
K. Dohlen
Affiliation:
LAM, Traverse du Siphon, 13376 Marseille, France
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Abstract

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In the context of extrasolar planet direct detection, we evaluated the performance of differential imaging with ground-based telescopes. This study was carried out in the framework of the VLT-Planet Finder project and is further extended to the case of Extremely Large Telescopes. Our analysis is providing critical specifications for future instruments mostly in terms of phase aberrations but also regarding alignments of the instrument optics or offset pointing on the coronagraph. It is found that Planet Finder projects on 8m class telescopes can be successful at detecting Extrasolar Giant Planets providing phase aberrations, alignments and pointing are accurately controlled. The situation is more pessimistic for the detection of terrestrial planets with Extremely Large Telescopes for which phase aberrations must be lowered at a very challenging level.

Keywords

instrumentation: high angular resolutionstars: low-massbrown dwarfsplanetary systems
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C200: Direct Imaging of Exoplanets: Science & Techniques , October 2005 , pp. 519 - 524
Copyright
© 2006 International Astronomical Union