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X-WR-CALNAME:Institut de Recherche en Astrophysique et Planétologie
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DTSTART;TZID=Europe/Paris:20261217T110000
DTEND;TZID=Europe/Paris:20261217T120000
DTSTAMP:20260915T074914Z
CREATED:20260915T074913Z
LAST-MODIFIED:20260915T074914Z
UID:19623-1797505200-1797508800@www.irap.omp.eu
SUMMARY:Extreme and Rapid Accretion in Supermassive Black Holes
DESCRIPTION:Claudio Ricci (U. Geneva) \n\n\n\n\n\n\n\n\n\nAccreting supermassive black holes are known to be variable\, changing in brightness across all wavelengths and timescales. In recent years\, a remarkable subset of these Active Galactic Nuclei (AGN) has been discovered to show extreme spectral variability. These changing-look events are thought to arise from extreme and rapid changes in how fast the black hole is feeding\, defying the expected accretion timescales for black holes with masses of millions to billions of solar masses. Such rapid variations provide unique insights into the physics of accretion in supermassive black holes. With the upcoming Vera C. Rubin Observatory’s Legacy Survey of Space and Time (LSST)\, we expect to uncover thousands of these dramatic transformations\, thanks to its combination of depth and rapid\, repeated imaging of the sky. In this talk\, I will review what we have learned about changing-look AGN so far\, and look ahead to how LSST\, combined with new large-scale spectroscopic surveys such as 4MOST\, will open a new era in our understanding of black hole accretion physics.
URL:https://www.irap.omp.eu/event/extreme-and-rapid-accretion-in-supermassive-black-holes/
LOCATION:Salle de Conférence – IRAP Roche\, 9 avenue du Colonel Roche\, Toulouse\, 31400\, FR
CATEGORIES:Séminaire IRAP
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DTSTART;TZID=Europe/Paris:20270121T110000
DTEND;TZID=Europe/Paris:20270121T120000
DTSTAMP:20261017T095146Z
CREATED:20261017T095145Z
LAST-MODIFIED:20261017T095146Z
UID:20014-1800529200-1800532800@www.irap.omp.eu
SUMMARY:Mapping the atmospheres of brown dwarfs and young giant exoplanets
DESCRIPTION:Benjamin Charnay (LAB Bordeaux) \n\n\n\n\n\n\n\n\n\nlarge-scale spectroscopic surveys such as 4MOST\, will open a new era in our understanding of black hole accretion physics.Brown dwarfs and young giant exoplanet are subject to variability and colour changes\, known as the L/T transition\, fundamental for their thermal evolution. Clouds are expected to be the main driver of the L/T. Using 1D and 3D atmospheric models\, we show that clouds play a major role in shaping the atmospheric properties of brown dwarfs\, in agreement with the observed variability and L/T transition. A major consequence of our 3D simulations is the preferential cloud formation in the equatorial region\, leading to a latitudinal thermal gradient which could impact the atmospheric chemistry. During the talk\, I will present a new technique to perform latitudinal mapping using high-resolution spectra. We apply this technique to CRIRES+ observations of the late L-dwarf DENIS J0255-4700 to reveal these latitudinal variations. Finally\, I will discuss the potential of this method for current instruments (i.e. VLT-Hirise\, CFHT-SPIRou) and future instruments on the ELT (i.e. ANDES\, METIS\, PCS).
URL:https://www.irap.omp.eu/event/mapping-the-atmospheres-of-brown-dwarfs-and-young-giant-exoplanets/
LOCATION:Salle Lyot – IRAP Belin\, 14 avenue Edouard Belin\, Toulouse\, 31400\, FR
CATEGORIES:Séminaire IRAP
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20270325T110000
DTEND;TZID=Europe/Paris:20270325T120000
DTSTAMP:20261026T105319Z
CREATED:20261017T095457Z
LAST-MODIFIED:20261026T105319Z
UID:20016-1805972400-1805976000@www.irap.omp.eu
SUMMARY:Convective dynamos in stars: large- vs small-scale
DESCRIPTION:Anna Guseva (UPC Barcelona) \n\n\n\n\n\n\n\n\n\nTBC
URL:https://www.irap.omp.eu/event/convective-dynamos-in-stars-large-vs-small-scale/
LOCATION:Salle Lyot – IRAP Belin\, 14 avenue Edouard Belin\, Toulouse\, 31400\, FR
CATEGORIES:Séminaire IRAP
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