caa a22 4500 445830123 CHVBK 20180317145312.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10686-011-9221-x doi (NATIONALLICENCE)springer-10.1007/s10686-011-9221-x A space Fresnel Imager for ultra-violet astrophysics: example on accretion disks [Elektronische Daten] [Truswin Raksasataya, Ana-Ines Gomez de Castro, Laurent Koechlin, Jean-Pierre Rivet] The Fresnel Diffractive Imager concept is proposed for space borne astronomical imaging at Ultra-Violet wavelengths, using diffractive focalization. The high angular resolution and high dynamic range provided by this new concept makes it an ideal tool to resolve circumstellar structures such as disks or jets around bright sources, among them, pre-main sequence stars and young planetary disks. The study presented in this paper addresses the following configuration of Fresnel diffractive imager: a diffractive array 4m large, with 696 Fresnel zones operating in the ultra-violet domain. The diffractive arrays are opaque foils punched with a large number of void subapertures with carefully designed shapes and positions. In the proposed space missions, these punched foils would be deployed in space. Depending on the size of the array and on the working spectral band, the focal length of such imagers will range from a few kilometers to a few tens of kilometers. Thus, such space mission requires a formation flying configuration for two satellites around the L2 Sun-Earth Lagragian point. In this article, we investigate numerically the potential of Fresnel arrays for imaging circumstellar dust environments. These simulations are based upon simple protostellar disk models, and on the computed optical characteristics of the instrument. The results show that protoplanetary disks at distances up to a few thousand parsecs can be successfully studied with a 4m aperture Fresnel imager in the UV. Springer Science+Business Media B.V., 2011 Circumstellar discs nationallicence Dust nationallicence High angular redulution nationallicence High dynamic range nationallicence Fresnel imager nationallicence Raksasataya Truswin Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 avenue Edouard Belin, 31400, Toulouse, France aut Gomez de Castro Ana-Ines Fac. de CC Matematicas, Universidad Complutense de Madrid, 28040, Madrid, Spain aut Koechlin Laurent Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 avenue Edouard Belin, 31400, Toulouse, France aut Rivet Jean-Pierre Observatoire de la Côte d'Azur, Département Cassiopée, Université de Nice Sophia-Antipolis, CNRS, B.P. 4229, 06304, NICE Cedex 4, France aut Experimental Astronomy Springer Netherlands 30/2-3(2011-06-01), 183-194 0922-6435 30:2-3<183 2011 30 10686 https://doi.org/10.1007/s10686-011-9221-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10686-011-9221-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Raksasataya Truswin Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 avenue Edouard Belin, 31400, Toulouse, France aut NATIONALLICENCE 700 1- Gomez de Castro Ana-Ines Fac. de CC Matematicas, Universidad Complutense de Madrid, 28040, Madrid, Spain aut NATIONALLICENCE 700 1- Koechlin Laurent Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 avenue Edouard Belin, 31400, Toulouse, France aut NATIONALLICENCE 700 1- Rivet Jean-Pierre Observatoire de la Côte d'Azur, Département Cassiopée, Université de Nice Sophia-Antipolis, CNRS, B.P. 4229, 06304, NICE Cedex 4, France aut NATIONALLICENCE 773 0- Experimental Astronomy Springer Netherlands 30/2-3(2011-06-01), 183-194 0922-6435 30:2-3<183 2011 30 10686 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer