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Eclipse partielle de Soleil du 25 octobre 2022. Crédits: Sébastien Derriere, ObAS Une éclipse solaire se produit lorsque la Lune passe entre le Soleil et la Terre, projetant son ombre sur notre planète et masquant partiellement ou totalement la lumière stellaire. Contrairement à une...
La traditionnelle Nuit des étoiles se tiendra cette année dans la soirée du vendredi 7 aout 2026.Ce sera l'occasion d'observer le ciel et une opportunité pour rencontrer et échanger avec des professionnels et passionnés d’astronomie. En collaboration avec le Jardin des Sciences, la...
"Dancing in the Dark: Data, Models, and the Milky Way's Dark Matter" In this talk, I will explore the interfacing of simulations, observations, and machine learning techniques to construct a detailed map of dark matter in the Milky Way, and argue that progress now hinges on the dance between...
"Cores, Outskirts, and Streams: Probing the Formation and Evolution of Globular Clusters" Globular clusters are among the oldest stellar systems in the Universe, acting as long-lived fossils of the early stages of galaxy formation. Their ages, dynamics, and chemical patterns show that they were...
"From Star Formation to Hot Gas: Tracing the Baryonic Universe to Unmask Fundamental Physics" The standard cosmological model provides a remarkable framework for understanding the dark universe, but the visible matter i.e. baryons introduces complex, non-linear astrophysics that precision...
"Extended body effects and gravitational wave astronomy" Born in 2015 with the first direct detection of gravitational waves emitted by a merging black hole binary, gravitational wave astronomy has since grown into a mature observational science. Hundreds of signals detected by ground-based...
"Decoding Galaxies & Star Formation Feedback with 100,000 Star Clusters: PHANGS-HST & JWST today, the future with HWO" The PHANGS-HST and JWST Treasury Programs have produced the most extensive inventories to date of optically visible and dust-obscured star clusters across nearby...
"Spiral arms in stellar and gaseous disks: engines of galaxy morphological transformation" Spirals are iconic features of galaxies, and yet conventional theoretical models for how they emerge and evolve only partially capture their observed traits and their connections to their host disks....
"Dust in galaxies at high redshift: insights from ALMA and JWST" Many questions remain in the study of dust in the early Universe. When does significant dust form? What are the properties of the dust grains compared to lower redshifts? How does dust impact our...
"Analysis of samples from the asteroids Ryugu and Bennu in the laboratory and implications for prebiotic chemistry issues" Undifferentiated small bodies, including small asteroids, are objects whose chemical composition has changed little for more than 4 billion years. Studying them provides...