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X-WR-CALDESC:Évènements pour CRAL
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DTSTART;TZID=Europe/Paris:20260306T110000
DTEND;TZID=Europe/Paris:20260306T120000
DTSTAMP:20260510T115129
CREATED:20260202T132640Z
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UID:8600-1772794800-1772798400@cral.osu-lyon.fr
SUMMARY:CRAL@Obs Seminar Guillaume Tochon
DESCRIPTION:
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-guillaume-tochon/
LOCATION:Observatoire
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DTSTART;TZID=Europe/Paris:20260313T110000
DTEND;TZID=Europe/Paris:20260313T120000
DTSTAMP:20260510T115129
CREATED:20260306T143202Z
LAST-MODIFIED:20260309T093212Z
UID:8613-1773399600-1773403200@cral.osu-lyon.fr
SUMMARY:CRAL@ENS Seminar by Olivier Ilbert (LAM\, Aix-Marseille University)-CANCELLED!
DESCRIPTION:Title: Stellar mass assembly of massive galaxies in the first five billion years of the Universe \n  \nAbstract:Over the past two decades\, extensive multi-wavelength observations of the COSMOS field have provided an exceptional view of galaxy evolution across cosmic time. With the recent addition of JWST/NIRCam imaging\, our understanding of the distant Universe has advanced dramatically. We can now investigate the physical properties and morphologies of massive galaxies at cosmic noon with unprecedented detail and extend these studies back to the primordial Universe. \nAfter introducing the broader context of galaxy formation and evolution\, I will present the confirmation for a population of unexpectedly bright galaxies already in place at z>10\, i.e.  less than 500 million years of cosmic time. These sources challenge standard models of early galaxy formation. While several explanations have been already suggested\, our clustering measurements support a scenario in which star-formation efficiency was significantly elevated in the young Universe. \nIn the second part of the talk\, I will present new results connecting star‑formation histories\, morphology\, and environment for galaxies at cosmic noon 1 < z < 3. These findings establish solid links between these key aspects of galaxy evolution\, and shed new light on the emergence of the massive and quenched elliptical galaxies. \n 
URL:https://cral.osu-lyon.fr/event/cralens-seminar-by-olivier-ilbert-lam-aix-marseille-university/
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DTSTART;TZID=Europe/Paris:20260424T110000
DTEND;TZID=Europe/Paris:20260424T120000
DTSTAMP:20260510T115129
CREATED:20260417T152342Z
LAST-MODIFIED:20260417T152342Z
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
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