EDP Sciences
Free access
Volume 443, Number 2, November IV 2005
Page(s) 709 - 720
Section Instruments, observational techniques, and data processing
DOI http://dx.doi.org/10.1051/0004-6361:20052880

A&A 443, 709-720 (2005)
DOI: 10.1051/0004-6361:20052880

High resolution imaging with Fresnel interferometric arrays: suitability for exoplanet detection

L. Koechlin1, D. Serre1 and P. Duchon2

1  Observatoire Midi Pyrénées, 14 avenue Edouard Belin, 31400 Toulouse, France
2  Centre National d'études spatiales, 18 avenue Edouard Belin, 31055 Toulouse Cedex, France

(Received 15 February 2005 / 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 $\mu$m). 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

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