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Haut contraste par réarrangement de pupille pour la détection d'exoplanètes

Abstract : The detection of exoplanets and young stars environment such as debris disks deals with two major difficulties: on one hand, the low angular distance between companion (or disk) and its host star, and on the other hand, the high contrast of flux between the two components. Interferometry is one of the techniques that solves these two issues. It is particularly the case in the application of nulling interferometry, in which we extinguish the flux from the main star thanks to coherence properties of the light.My thesis work takes part in this context, with the study of eight debris disks observationnal data made at the Very Large Telescope, using the Sparse Aperture Maskig interferometric technique. I achieved the data reduction and the analysis of closure phases. As no companion was found in the data, I derived detection limits in terms of luminosity and estimated mass.My thesis also consisted in an instrumental part, with the conception of the FIRST-IR (Fibered Imager foR a Single Telescope InfraRed) instrument in laboratory. This instrument is an interferometer which associates fibered pupil remapping technique and integrated optic based recombination of light.To conclude, I have shown the viability of FIRST-IR instrument using this new integrated optic based nuller architecture. Particularly, I demonstrated that closure phase remains stable for a source point target, regardless of the nulling level applied.
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Lucien Gauchet. Haut contraste par réarrangement de pupille pour la détection d'exoplanètes. Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]. Université Sorbonne Paris Cité, 2017. Français. ⟨NNT : 2017USPCC109⟩. ⟨tel-01989595⟩

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