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Contribution au mode coronographique de la mission Darwin

Abstract : The main goal of the ESA Darwin mission is to achieve, in the thermal infrared spectral domain, the direct detection of earth-like exo-planets around nearby stars and to analyse their atmosphere (if any) to search for spectral features of bio-markers, revealing the possible presence of life, as we know it.
Using the technique of nulling interferometry induces two technological critical points : an optical system must combine four telescope beams and apply an achromatic pi phase shift on two of them.
This manuscript presents the study of a dedicaced optical system for beam combination, named “AIC cascade”.
A first part summarizes the scientific context of the Darwin mission and the technological development currently planned.
A second part describes the AIC cascade principle and its technical feasability study. This one contains the analyse of instrumental constraints, induced by the Darwin nulling mode, and the resulting specifications assessment.
A third part describes new technologies, potentially able to provide new solutions of technological hard points, and the Darwin groundbased demonstrator, called GENIE.
The technical specifications are in accordance with current technological capabilities. In conclusion the AIC cascade could be an alternative solution for the Darwin nulling mode.
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Contributor : Laurent Escarrat <>
Submitted on : Monday, February 13, 2006 - 1:11:59 PM
Last modification on : Monday, October 12, 2020 - 11:10:16 AM
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  • HAL Id : tel-00011592, version 1



Laurent Escarrat. Contribution au mode coronographique de la mission Darwin. Astrophysique [astro-ph]. Université Nice Sophia Antipolis, 2003. Français. ⟨tel-00011592⟩



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