| Issue |
A&A
Volume 374, Number 3, August II 2001
|
|
|---|---|---|
| Page(s) | 1161 - 1168 | |
| Section | Numerical methods and codes | |
| DOI | https://doi.org/10.1051/0004-6361:20010619 | |
| Published online | 15 August 2001 | |
The achromatic phase knife coronagraph
1
Observatoire de la Côte d'Azur, Département Fresnel, CNRS UMR 6528, 06460 Saint Vallier de Thiey, France
2
Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France
Corresponding author: L. Abe, Lyu.Abe@obs-azur.fr
Received:
20
November
2000
Accepted:
11
April
2001
We present the concept of a nulling coronagraph which theoretically attains the brightness ratio of 108 suitable to directly detect exo-Earths in the vicinity of their parent stars. The concept is derived from the classical Foucault's optics test and Zernike's self-destructive phase contrast principle. We propose an achromatic set-up which should dramatically improve its wide band efficiency. The whole system is simulated against a numerical model which validates a formal analytical approach. The coronagraph is then compared to other concepts and its advantages and shortcomings are outlined, suggesting future laboratory developments and tests on the sky.
Key words: techniques: interferometric / stars: binaries: close / stars: planetary systems
© ESO, 2001
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