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DTSTART;TZID=Europe/Paris:20260424T110000
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DTSTAMP:20260418T043337
CREATED:20260417T152342Z
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UID:8660-1777028400-1777032000@cral.osu-lyon.fr
SUMMARY:CRAL Seminar @Observatory by Philippe Priolet
DESCRIPTION:Title: The puzzling nature of hot exozodiacal dust: the case of Beta Pictoris \nAbstract: Hot exozodiacal clouds are populations of dust grains residing in the inner regions of main-sequence stars at temperatures exceeding 1000K. It is a puzzling phenomena in exoplanetary science. On theoretical grounds\, such dust should rapidly sublimate or be expelled by radiation pressure\, yet interferometric observations continue to reveal its presence around a growing number of stars. The lack of a satisfying physical model\, combined with the intrinsic difficulty of resolving emission just tens of milliarcseconds from the host star\, makes every new high-quality dataset particularly valuable.\nIn this talk\, I will begin with a general introduction to exozodiacal dust: its origin\, physical properties\, and the interferometric techniques used to detect it. I will then present new VLTI/MATISSE observations of Beta Pictoris\, one of the most iconic debris disk systems and a prime target for studying the inner regions of a young planetary system. A central challenge in the analysis of interferometric data is the proper handling of correlated noise\, and I will describe our approach to estimating correlation matrices for MATISSE data\, which is critical for obtaining robust constraints on the dust properties. I will close with an outlook on the future of this field\, discussing the prospects offered by nulling interferometry with VLTI/NOTT\, and the broader implications of exozodiacal dust for the direct imaging of Earth-like planets with next-generation facilities such as the Habitable Worlds Observatory and the Extremely Large Telescope. \n 
URL:https://cral.osu-lyon.fr/event/cral-seminar-observatory-by-philippe-priolet/
LOCATION:Observatoire
ATTACH;FMTTYPE=image/png:https://cral.osu-lyon.fr/wp-content/uploads/2023/11/image_defaut.png
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