Issue |
A&A
Volume 403, Number 1, May III 2003
|
|
---|---|---|
Page(s) | 369 - 381 | |
Section | Astronomical instrumentation | |
DOI | https://doi.org/10.1051/0004-6361:20030278 | |
Published online | 29 April 2003 |
Achromatic dual-zone phase mask stellar coronagraph
1
Laboratoire Universitaire d'Astrophysique de Nice – UMR 6525, Université de Nice Sophia Antipolis, Parc Valrose, 06108 Nice Cedex 2, France e-mail: Claude.Aime@unice.fr
2
Laboratoire d'Astrophysique de Marseille, 2 place Leverrier, 13248 Marseille, Cedex 4, France e-mail: Kjetil.Dohlen@oamp.fr
Corresponding author: R. Soummer, Remi.Soummer@unice.fr
Received:
31
October
2002
Accepted:
14
February
2003
This paper presents a generalization of the Roddier & Roddier Phase Mask coronagraph for polychromatic observations. It is shown that using a dual-zone phase mask, combined with complex apodization, both phase and size chromatism can be compensated simultaneously to produce high extinction of a point source over large bandwidths, for example the entire K band with a residual integrated starlight of and a star intensity level of 10-6 at an angular separation of . Other advantages of the proposed technique include the compatibility with centrally obscured telescopes, absence of blind axes and no symmetrization of the images.
Key words: instrumentation: high angular resolution / techniques: high angular resolution / stars: planetary systems
© ESO, 2003
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