Issue |
A&A
Volume 389, Number 1, July I 2002
|
|
---|---|---|
Page(s) | 334 - 344 | |
Section | Numerical methods and codes | |
DOI | https://doi.org/10.1051/0004-6361:20020419 | |
Published online | 14 June 2002 |
Total coronagraphic extinction of rectangular apertures using linear prolate apodizations
UMR 6525 Astrophysique, Faculté des Sciences, Université de Nice Sophia Antipolis, Parc Valrose, 06108 Nice Cedex 2, France e-mail: Claude.Aime@unice.fr, Andrea.Ferrari@unice.fr
Corresponding author: R. Soummer, Remi.Soummer@unice.fr
Received:
25
July
2001
Accepted:
8
March
2002
This paper presents a theoretical study of stellar coronagraphy with apodized entrance apertures. The study is restricted to a perfect telescope operating in space, and a monochromatic on-axis unresolved star. It is shown that linear prolate functions are the optimal apodizers for rectangular apertures in stellar coronagraphy. With the phase mask technique (Roddier & Roddier 1997), prolate functions can produce a total extinction of the star light. For Lyot's coronagraphy, the extinction is not complete, but prolate apodizations lead to an optimal star residual intensity with surprising interesting properties: the residual star light and the planet enjoy the same apodized intensity pattern (but different dynamic) with the optimal light concentration. With this technique, very high rejection rates can be obtained for Lyot's coronagraphy, with smaller mask sizes.
Key words: instrumentation: high angular resolution / technique: high angular resolution / stars: planetary systems
© ESO, 2002
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.