Astron. Astrophys. Suppl. Ser.
Volume 141, Number 1, January I 2000
|Page(s)||157 - 164|
|Published online||15 January 2000|
Refined laboratory simulations of dark-speckle coronagraphy
DESPA, Observatoire de Paris-Meudon, 5 Pl. J. Janssen, F-92195 Meudon, France e-mail: email@example.com
2 ESO Santiago, Chile e-mail: firstname.lastname@example.org
3 Observatoire de la Côte d'Azur, Département Fresnel, ISA-GI2T, F-06460 Saint Vallier de Thiey, France e-mail: email@example.com
Send offprint request to: A. Boccaletti
Accepted: 29 September 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
© European Southern Observatory (ESO), 2000