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X-ORIGINAL-URL:https://cral.osu-lyon.fr
X-WR-CALDESC:Évènements pour CRAL
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251017T110000
DTEND;TZID=Europe/Paris:20251017T120000
DTSTAMP:20260510T113157
CREATED:20250915T083614Z
LAST-MODIFIED:20250915T083614Z
UID:8130-1760698800-1760702400@cral.osu-lyon.fr
SUMMARY:CRAL@Obs Seminar - Sophia Stacevic (LIRA\, Paris)
DESCRIPTION:
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-sophia-stacevic-lira-paris/
LOCATION:Observatoire
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251024T110000
DTEND;TZID=Europe/Paris:20251024T120000
DTSTAMP:20260510T113157
CREATED:20251022T103216Z
LAST-MODIFIED:20251022T103216Z
UID:8231-1761303600-1761307200@cral.osu-lyon.fr
SUMMARY:CRAL@Obs Seminar – Seok-Jun Chang (MPIA)
DESCRIPTION:Title: Probing Cold Gas around Galaxies through the Mg II Resonance Doublet \nAbstract: The structure and kinematics of the gas around and in galaxies are crucial for understanding the multiphase flows within the galactic ecosystem and\, thus\, galaxy evolution and star formation. Recent advancements in instruments and techniques offer a new perspective on circumgalactic gas flows through emission lines such as Hydrogen Lyman-α and resonance lines of metals (e.g.\, Mg II\, C IV\, O VI\, and N V). In particular\, the Mg II λλ2796\, 2803 doublet has emerged as a promising tracer of cold gas at T ~ 10^4 K. To decode the message carried by the Mg II doublet emission\, we developed a 3D Monte-Carlo radiative transfer code ‘RT-scat’. In this talk\, I will present simulated results from ‘RT-scat’\, demonstrating how Mg II lines form in various environments\, including inflowing/outflowing\, smooth/clumpy\, and dusty gas. In particular\, I will also highlight how the MgII doublet line ratio can serve as a potential indicator of LyC escape. Furthermore\, I will introduce our new radiative transfer modeling of Mg II emission halos around star-forming galaxies at z ~ 1 from the MAGG and MUDF survey. Our results indicate the presence of slowly moving or outflowing cold gas and reveal strong anisotropies in its distribution. If time allows\, I will also discuss other metal resonance lines as tracers of multiphase gas.
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-seok-jun-chang-mpia/
LOCATION:Observatoire
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251121T110000
DTEND;TZID=Europe/Paris:20251121T120000
DTSTAMP:20260510T113157
CREATED:20250915T083903Z
LAST-MODIFIED:20250915T083903Z
UID:8135-1763722800-1763726400@cral.osu-lyon.fr
SUMMARY:CRAL@ENS Seminar - Adnan Ali Ahmad (AstroENS)
DESCRIPTION:
URL:https://cral.osu-lyon.fr/event/cralens-seminar-adnan-ali-ahmad-astroens/
LOCATION:ENS
ATTACH;FMTTYPE=image/png:https://cral.osu-lyon.fr/wp-content/uploads/2023/11/image_defaut.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251205T110000
DTEND;TZID=Europe/Paris:20251205T120000
DTSTAMP:20260510T113157
CREATED:20251201T130744Z
LAST-MODIFIED:20251201T130744Z
UID:8486-1764932400-1764936000@cral.osu-lyon.fr
SUMMARY:CRAL@Obs Seminar - Mathias Nowak (LIRA\, Paris)
DESCRIPTION:Title:   \nResults and perspectives from the ExoGRAVITY Large Programme\n\nAbstract:\nThe direct detection of a giant exoplanet using long-baseline interferometry in 2019 marked the debut of the GRAVITY instrument in exoplanet research. This breakthrough was followed by the detailed spectroscopic characterization of beta Pictoris b’s atmosphere in 2020\, demonstrating the potential of long-baseline interferometry for studying young giant planets. These successes led to the establishment of the ExoGRAVITY Large Programme on the Very Large Telescope Interferometer (VLTI)\, dedicated to the characterization of young giant planets. Fast forward five years\, and this innovative method has yielded a wealth of discoveries\, including the direct confirmation of beta Pictoris c\, the detection of brown dwarf companions inferred from Gaia data\, and the resolution of the « underluminous » brown dwarfs puzzle. The implementation of GRA4MAT has expanded observation capabilities to include longer wavelengths (L to N bands)\, while the GRAVITY+ upgrade promises enhanced contrast at small separations in K-band. Initiatives are now underway to explore shorter wavelengths (J and Y bands) at the VLTI\, offering strong potential for exoplanet studies. The detection of giant planets in reflected light\, rather than thermal emission\, is quickly becoming the next frontier in high-contrast interferometry\, inspiring more ambitious ideas\, such as adding a new Unit Telescope (UT) to the VLTI array. In this talk\, I will review the key results of the ExoGRAVITY Large Programme and provide perspectives on upcoming developments in high-contrast interferometry for exoplanet characterization.
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-mathias-nowak-lira-paris/
LOCATION:Observatoire
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251212T110000
DTEND;TZID=Europe/Paris:20251212T130000
DTSTAMP:20260510T113157
CREATED:20251201T130959Z
LAST-MODIFIED:20251201T130959Z
UID:8492-1765537200-1765544400@cral.osu-lyon.fr
SUMMARY:CRAL@Obs Seminar - Faustine Cantalloube & Julien Milli (IPAG\, Grenoble)
DESCRIPTION:Titre: L’impact du dérèglement climatique sur l’astronomie observationnelle\n\nRésumé: Les grands observatoires astronomiques fonctionnant dans le visible/infrarouge sont souvent accompagnés de station météo afin de suivre les paramètres clés qui affectent la qualité des observations obtenues. La plupart de ces suivis ont maintenant atteint une échelle temporelle de 30ans\, permettant d’explorer si il existe des variations climatiques dans les données. L’étude à donc été menée sur de nombreux sites\, en particulier à l’observatoire du Cerro Paranal (Chili) qui abrite le Very Large Telescope et l’observatoire du Mauna Kea (Hawaii) qui abrite notamment le Canada France Hawai Telescope. Cependant\, un observatoire astronomique est plus qu’un ensemble de quantités physiques\, il faut aussi prendre en compte tout un ecosystème qui permet à un observatoire d’opérer de façon fonctionnelle…
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-faustine-cantalloube-julien-milli-ipag-grenoble/
LOCATION:Observatoire
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260227T110000
DTEND;TZID=Europe/Paris:20260227T120000
DTSTAMP:20260510T113157
CREATED:20260202T132535Z
LAST-MODIFIED:20260202T132651Z
UID:8598-1772190000-1772193600@cral.osu-lyon.fr
SUMMARY:CRAL@ENS Seminar Ruediger Pakmor
DESCRIPTION:TBD
URL:https://cral.osu-lyon.fr/event/cralens-ruediger-pakmor/
LOCATION:ENS
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260306T110000
DTEND;TZID=Europe/Paris:20260306T120000
DTSTAMP:20260510T113157
CREATED:20260202T132640Z
LAST-MODIFIED:20260202T132640Z
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
ATTACH;FMTTYPE=image/png:https://cral.osu-lyon.fr/wp-content/uploads/2023/11/image_defaut.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260313T110000
DTEND;TZID=Europe/Paris:20260313T120000
DTSTAMP:20260510T113157
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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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260424T110000
DTEND;TZID=Europe/Paris:20260424T120000
DTSTAMP:20260510T113157
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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