Volume 443, Number 2, November IV 2005
|Page(s)||709 - 720|
|Published online||04 November 2005|
High resolution imaging with Fresnel interferometric arrays: suitability for exoplanet detection
Observatoire Midi Pyrénées, 14 avenue Edouard Belin, 31400 Toulouse, France
2 Centre National d'études spatiales, 18 avenue Edouard Belin, 31055 Toulouse Cedex, France
Accepted: 20 July 2005
We propose a new kind of interferometric array that yields images of high dynamic range and large field. The numerous individual apertures in this array form a pattern related to a Fresnel zone plate. This array can be used for astrophysical imaging over a broad spectral bandwidth spanning from the UV (50 nanometers) to the IR (20 μm). Due to the long focal lengths involved, this instrument requires formation-flying of two space borne vessels. We present the concept and study the S/N ratio in different situations, then apply these results to probe the suitability of this concept to detect exoplanets.
Key words: instrumentation: interferometers / stars: planetary systems
© ESO, 2005
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