Free Access
Astron. Astrophys. Suppl. Ser.
Volume 141, Number 1, January I 2000
Page(s) 157 - 164
Published online 15 January 2000
DOI: 10.1051/aas:2000114

Astron. Astrophys. Suppl. Ser. 141, 157-164

Refined laboratory simulations of dark-speckle coronagraphy

A. Boccaletti1 - C. Moutou2 - L. Abe3

Send offprint request: A. Boccaletti

1 - DESPA, Observatoire de Paris-Meudon, 5 Pl. J. Janssen, F-92195 Meudon, France
2 - ESO Santiago, Chile
3 - Observatoire de la Côte d'Azur, Département Fresnel, ISA-GI2T, F-06460 Saint Vallier de Thiey, France

Received June 2; accepted September 29, 1999


Dark-speckle coronagraphy with large telescopes is expected to image extrasolar planets. We present new results about the dark-speckle coronagraphic camera, obtained in the laboratory with a simulated atmosphere and an adaptive optics bench. In good seeing conditions, and with an accurate subtraction of a reference frame, we show that our instrument allows high-resolution, high-contrast imaging, more effectively than classical long exposure, for magnitude differences larger than 5 at visible wavelength. With the present capability of the adaptive optics system used, on a 1.5 m telescope pupil, we should expect to detect stellar companions 104 fainter than the primary star. Instrument concepts and processing techniques are discussed.

Key words: methods: data analysis -- methods: laboratory -- techniques: interferometric -- binaries: close -- planetary systems -- brown dwarfs

Copyright The European Southern Observatory (ESO)

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.