![]() ![]() We describe the principles and the experimental demonstration of a simple, double-sideband analog correlator. Among the different technological challenges of heterodyne interferometry, we propose to address the problem of bandwidth limitation and of the correlation of a large number of wideband radiofrequency signals by introducing the use of analog photonic correlation. On a theoretical level, we analyze the sensitivity performances of a interferometer integrating these recent progresses, and clarify the fundamental limitations in sensitivity due to the intrinsic quantum noise of this technique. In this work, we propose the revisit the architecture of an infrared heterodyne interferometric system at the light of the recent progresses in the field of mid-infrared technologies. In this perspective, infrared heterodyne interferometry represents a potential interesting technology, despite its lower sensitivity. ![]() ![]() ![]() In the instrumental part of this work, we explore the extension of infrared interferometers to the recombination of a large number of telescopes and kilometric baselines in the mid-infrared, such as proposed in the framework of the Planet Formation Imager (PFI) initiative. Although infrared interferometry is a powerful technique to constrain the structure of the inner region of young objects, its capability to perform complete image reconstruction of protoplanetary disk is still limited. In the observational part, we focus on the accretion outburst occuring in the formation of young stars through a temporal monitoring of FU Orionis with 20 years of near-infrared interferometric data, in order to put constraints on the instability mechanisms at play in the disk. This work includes both observational and instrumental aspects. This thesis work focuses on the study at the astronomical scale of young stars and their protoplanetary disks with infrared interferometry. ![]()
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