The Fresnel space imager as a disk evolution watcher

Castro, Ana Inés Gómez de

doi:10.1007/s10686-011-9223-8

Cited by 3 publications

(3 citation statements)

References 27 publications

(27 reference statements)

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“…Once validated in relevant space conditions, we plan to apply for a full sized UV imager that could be used as space telescope for a broad set of astrophysical science cases requiring high dynamic range in UV (see Raksasataya et al 2011 [15], Gómez de Castro 2011 [6], Hinglais 2011 [8]).…”

Section: Test Mission Proposed In Space On the Iss And Scientific Returnmentioning

confidence: 99%

Improvements on Fresnel arrays for high contrast imaging

Roux

Koechlin

2018

Exp Astron

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The Fresnel Diffractive Array Imager (FDAI) is based on a new optical concept for space telescopes, developed at Institut de Recherche en Astrophysique et Planétologie (IRAP), Toulouse, France. For the visible and near-infrared it has already proven its performances in resolution and dynamic range. We propose it now for astrophysical applications in the ultraviolet with apertures from 6 to 30 meters, aimed at imaging in UV faint astrophysical sources close to bright ones, as well as other applications requiring high dynamic range. Of course the project needs first a probatory mission at small aperture to validate the concept in space. In collaboration with institutes in Spain and Russia, we will propose to board a small prototype of Fresnel imager on the International Space Station (ISS), with a program combining technical tests and astrophysical targets. The spectral domain should contain the Lyman-α line (λ = 121 nm). As part of its preparation, we improve the Fresnel array design for a better Point Spread Function in UV, presently on a small laboratory prototype working at 260 nm. Moreover, we plan to validate a new optical design and chromatic correction adapted to UV. In this article we present the results of numerical propagations showing the improvement in dynamic range obtained by combining and adapting three methods : central obturation, optimization of the bars mesh holding the Fresnel rings, and orthogonal apodization. We briefly present the proposed astrophysical program of a probatory mission with such UV optics.

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Section: Test Mission Proposed In Space On the Iss And Scientific Returnmentioning

confidence: 99%

Improvements on Fresnel arrays for high contrast imaging

Roux

Koechlin

2018

Exp Astron

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“…The UV 120 nm is a limit for classical optical difficulties in the receiver satellite. The Lyman-α wavelength, even if requesting specific materials and coatings, is of great interest for astrophysics [6,7].…”

Section: Assessment and Justification Of The Study Limitsmentioning

confidence: 99%

A space Fresnel imager concept assessment study led by CNES for astrophysical applications

Hinglais

2011

Exp Astron

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In 2009, the Centre National d'Etudes Spatiales (CNES) carried out an assessment study on a "Fresnel telescope" concept based on a twospacecraftformation flying configuration. This concept uses a binary Fresnel zone plate, and the principle of diffraction focusing, which allows high resolution optical imaging for astrophysics. In addition to CNES, the Laboratoire d'Astrophysique de Toulouse Tarbes (LATT) was deeply involved at two levels: through Research & Technology (R&T) studies to simulate and validate on a test bench the Fresnel concept performance, and through active participation in the CNES team for the optical aspects and to define the astrophysical fields of Fresnel-based space missions. The study was conducted within the technical limitations that resulted from a compromise between the R&T state of the art and the potential scientific domains of interest. The main technical limitations are linked to the size of the primary Fresnel array and to its usable spectral bandwidth. In this framework, the study covers ambitious architectures, correlating the technology readiness of the main critical components with the time-scale and programmatic horizons. The possible scientific topics arise from this range of missions. In this paper, I present a mission launched by a Soyuz, dedicated to astrophysics in the Ultra Violet (UV) band: 120 to 300 nm using a 4-m Fresnel array. It could be competitive in the next fifteen years, whereas a 10-m aperture mission in different bands; UV, visible or Infra Red (IR) (up to 6 μm) could be achievable in the future. Larger missions, using a primary array larger than 20 m, request technologies not yet available but that will probably be based on new inflatable structures with membranes, as already tested in the USA for other ends.

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“…At longer distances, there is established scientific interest in the UV domain for the accretion disks around young stars and formation of exoplanetary systems [10,11,25]. These rotating reservoirs of gas and dust are the birthplaces of new planetary systems and UV radiation plays an important role in synthesizing the organic molecules necessary for the emergence of life.…”

Section: Accretion Disks Around Young Starsmentioning

confidence: 99%