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X-ORIGINAL-URL:https://cral.osu-lyon.fr
X-WR-CALDESC:Évènements pour CRAL
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DTSTART:20240331T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20250221T110000
DTEND;TZID=Europe/Paris:20250221T120000
DTSTAMP:20260510T114018
CREATED:20241119T113621Z
LAST-MODIFIED:20250217T173617Z
UID:7575-1740135600-1740139200@cral.osu-lyon.fr
SUMMARY:CRAL@Obs seminar by Valentina D'Odorico (INAF)
DESCRIPTION:Understanding metal enrichment in the early Universe through quasar spectroscopy —\n \nChemical elements heavier than helium – commonly referred to as “metals” in astrophysics – are synthesized by stars and distributed in the surrounding medium through various feedback mechanisms. This process plays a pivotal role in the baryon cycle of galaxies and is crucial for understanding galaxy evolution. In this seminar\, I will provide an overview of how quasar absorption spectroscopy has been instrumental in studying the properties of metals within the diffuse circumgalactic and intergalactic media over the past two decades. I will particularly focus on observations spanning the timescale between the epoch of Reionization and the so-called cosmic noon at the peak of star formation\, using state-of-the-art data like the spectra of z~6 quasars from the XQR-30 survey. Additionally\, I will discuss the exciting challenges in the study of high redshift metal enrichment and how next-generation extremely large telescopes will help us address these issues.  \n 
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-by-valentina-dodorico-inaf/
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:20250228T110000
DTEND;TZID=Europe/Paris:20250228T120000
DTSTAMP:20260510T114018
CREATED:20241119T113818Z
LAST-MODIFIED:20241119T113818Z
UID:7577-1740740400-1740744000@cral.osu-lyon.fr
SUMMARY:CRAL@Obs seminar by Guillaume Bourdarot (MPE)
DESCRIPTION:TBD
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-by-guillaume-bourdarot-mpe/
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:20250307T080000
DTEND;TZID=Europe/Paris:20250307T170000
DTSTAMP:20260510T114018
CREATED:20241119T113926Z
LAST-MODIFIED:20241119T113926Z
UID:7579-1741334400-1741366800@cral.osu-lyon.fr
SUMMARY:CRAL@Obs seminar by Nicolas Laporte (LAM)
DESCRIPTION:TBD
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-by-nicolas-laporte-lam/
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:20250321T110000
DTEND;TZID=Europe/Paris:20250321T120000
DTSTAMP:20260510T114018
CREATED:20250113T175422Z
LAST-MODIFIED:20250113T175422Z
UID:7687-1742554800-1742558400@cral.osu-lyon.fr
SUMMARY:CRAL@Obs seminar by Lucie Leboulleux (IPAG)
DESCRIPTION:TBD
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-by-lucie-leboulleux-ipag/
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:20250328T110000
DTEND;TZID=Europe/Paris:20250328T120000
DTSTAMP:20260510T114018
CREATED:20241121T114326Z
LAST-MODIFIED:20241121T114326Z
UID:7601-1743159600-1743163200@cral.osu-lyon.fr
SUMMARY:CRAL@Obs seminar by Michele Fumagalli (University of Milano Bicocca)
DESCRIPTION:TBD
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-by-michele-fumagalli-university-of-milano-bicocca/
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:20250404T110000
DTEND;TZID=Europe/Paris:20250404T120000
DTSTAMP:20260510T114018
CREATED:20241119T114052Z
LAST-MODIFIED:20241119T114052Z
UID:7581-1743764400-1743768000@cral.osu-lyon.fr
SUMMARY:CRAL@Obs colloquium by Joop Schaye (Leiden)
DESCRIPTION:TBD
URL:https://cral.osu-lyon.fr/event/cralobs-colloquium-by-joop-schaye-leiden/
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:20250411T110000
DTEND;TZID=Europe/Paris:20250411T120000
DTSTAMP:20260510T114018
CREATED:20241119T114156Z
LAST-MODIFIED:20250411T064745Z
UID:7583-1744369200-1744372800@cral.osu-lyon.fr
SUMMARY:CRAL@Obs seminar by Hannah Ubler (MPE)
DESCRIPTION:Observational constraints on massive black holes in the first billion years \nOne of the most surprising results coming out of the first years of science operations with JWST is the unexpectedly high abundance of actively accreting black holes in the early Universe. Compared to the local population\, many of these early black holes appear to differ in various aspects\, such as their relation to their host galaxies or their multi-wavelength properties. These observational findings challenge our understanding of the past evolution of present-day supermassive black holes\, and provide new ways to constrain theoretical models of black hole formation and growth. I will give an overview of recent observational results on massive black holes in the first few billion years\, driven by the unprecedented capabilities of JWST to explore cosmic dawn\, and with a focus on results from the NIRSpec GTO surveys JADES and GA-NIFS\, and the GO Large Program BlackTHUNDER.
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-by-hannah-ubler-cambridge/
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:20250418T110000
DTEND;TZID=Europe/Paris:20250418T120000
DTSTAMP:20260510T114018
CREATED:20250124T172056Z
LAST-MODIFIED:20250409T143158Z
UID:7725-1744974000-1744977600@cral.osu-lyon.fr
SUMMARY:CRAL@ENS Seminar by Philipp Girichidis (Universität Heidelberg)
DESCRIPTION:Cosmic rays in the interstellar medium\nCosmic rays (CRs) are high energy particles with with an energy density comparable to the other energy densities in the interstellar medium (ISM) and very distinct cooling and transport processes. The low cooling efficiency of CRs allows them to travel long distances from their location of acceleration. As a result\, they have an impact on star formation at small scales and high densities. Furthermore\, the pressure exerted by CRs fills the galaxy\, enabling the launching of galactic-scale outflows. These outflows have a significant influence on galactic evolution. \nIn this review\, I will focus on the dynamical impact of CRs\, demonstrating how they shape the ISM and contribute to the launching of galactic outflows. There are significant uncertainties in our understanding of CR astrophysics\, particularly regarding the speed at which they are transported and the efficiency with which they lose energy. I will highlight the efforts to address these uncertainties by incorporating CRs into hydrodynamical simulations. These simulations aim to accurately model their evolution from non-relativistic to relativistic regimes\, while also considering the full magneto-hydrodynamical evolution. By doing so\, this improves the accuracy of the CR-driven dynamics and allows us to generate synthetic observables such as gamma rays and synchrotron radiation\, which provide valuable insights into the transport and cooling properties of CRs.
URL:https://cral.osu-lyon.fr/event/cralens-seminar-by-philipp-girichidis-universitat-heidelberg/
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:20250425T110000
DTEND;TZID=Europe/Paris:20250425T120000
DTSTAMP:20260510T114018
CREATED:20241218T110243Z
LAST-MODIFIED:20241218T110243Z
UID:7642-1745578800-1745582400@cral.osu-lyon.fr
SUMMARY:CRAL@Obs seminar by Hakim Atek (IAP)
DESCRIPTION:TBD
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-by-hakim-atek-iap/
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:20250516T110000
DTEND;TZID=Europe/Paris:20250516T120000
DTSTAMP:20260510T114018
CREATED:20250411T100318Z
LAST-MODIFIED:20250411T100318Z
UID:7948-1747393200-1747396800@cral.osu-lyon.fr
SUMMARY:CRAL@ENS Seminar Dorottya Szécsi
DESCRIPTION:TBD
URL:https://cral.osu-lyon.fr/event/cralens-seminar-dorottya-szecsi/
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:20250523T110000
DTEND;TZID=Europe/Paris:20250523T120000
DTSTAMP:20260510T114018
CREATED:20241218T111124Z
LAST-MODIFIED:20250519T145817Z
UID:7650-1747998000-1748001600@cral.osu-lyon.fr
SUMMARY:CRAL@Obs internal seminar by Louis Quilley
DESCRIPTION:Galaxy morphology: how the growth of their bulge shapes the evolution of galaxies — \nAlmost a century after the publication of the Hubble sequence (Hubble 1926)\, that classifies galaxies according to their shapes and features\, galaxy morphology remains a topical issue. Indeed\, the structure of galaxies provide insight on how they acquire their mass\, grow their stellar populations\, and eventually cease their star formation. After presenting how galaxy images can be analysed to characterize their morphologies\, I will describe how the properties of bulges and disks vary along the Hubble sequence\, and how galaxies of diverse morphologies are distributed across the colour-mass diagram\, as well as across various key scaling relations. This will highlight how morphological transformations\, and especially the growth of the bulge\, can be connected to their star-forming history. Then\, I will discuss how the capabilities of ESA’s latest space telescope Euclid\, launched in July 2023\, can be leveraged to retrace the history of the Hubble sequence\, and I will present the first strides made in that avenue of research\, through the build-up of an unprecedented morphological catalogue\, and the first analyses of galaxy morphology across cosmic times and along the Cosmic Web.
URL:https://cral.osu-lyon.fr/event/cralobs-internal-seminar-by-louis-quilley/
LOCATION:Observatoire
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20250606T110000
DTEND;TZID=Europe/Paris:20250606T120000
DTSTAMP:20260510T114018
CREATED:20250113T175712Z
LAST-MODIFIED:20250113T175712Z
UID:7689-1749207600-1749211200@cral.osu-lyon.fr
SUMMARY:CRAL@Obs internal seminar by Rémi Giroud
DESCRIPTION:TBD
URL:https://cral.osu-lyon.fr/event/cralobs-internal-seminar-by-remi-giroud/
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20250613T110000
DTEND;TZID=Europe/Paris:20250613T120000
DTSTAMP:20260510T114018
CREATED:20250314T152507Z
LAST-MODIFIED:20250611T083137Z
UID:7834-1749812400-1749816000@cral.osu-lyon.fr
SUMMARY:CRAL@Obs seminar by Pierre Ocvirk (Observatoire de Strasbourg)
DESCRIPTION:Towards simulating the Epoch of Reionization on exascale supercomputers —  \nThe Epoch of Reionization (EoR) represents a fundamental phase transition in cosmic history\, demanding sophisticated numerical simulations to interpret observations of the high-z Lyman alpha forest\, combined with HST/JWST\, and upcoming 21cm surveys. Our latest Cosmic Dawn III simulation has redefined the state-of-the-art by simultaneously and precisely predicting multiple EoR observables: the evolution of the neutral Hydrogen fraction\, Thomson scattering optical depth\, ionizing photon rates\, Lyman-α forest optical depth distributions\, and ionizing mean free path evolution. However\, critical limitations persist\, including insufficient spatial resolution for internal galaxy physics and box sizes still to small for interpreting observed volumes like ASPIRE/EIGER. Breaking through these barriers requires exascale computing and new computational frameworks\, which I will illustrâtes. Additionally\, I will discuss the underexplored limitations of the M1 radiative transfer model\, presenting new work by PhD student Mei Palanque on Pn methods coupled to photochemistry\, which quantifies M1 artifacts and opens pathways to more accurate EoR modeling.
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-by-pierre-ocvirk-observatoire-de-strasbourg/
LOCATION:Observatoire
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20250704T110000
DTEND;TZID=Europe/Paris:20250704T120000
DTSTAMP:20260510T114018
CREATED:20250611T083449Z
LAST-MODIFIED:20250702T102220Z
UID:8030-1751626800-1751630400@cral.osu-lyon.fr
SUMMARY:CRAL@Obs seminar by Rahna Payyasseri Thanduparackal (CEFCA\, Teruel)
DESCRIPTION:Mapping Extended Circumgalactic Lyα Nebulae Around Quasars With J-PAS —  \nCircum-Galactic Medium (CGM) is the gas surrounding galaxies outside their disksand inside their virial radii. Lyman-alpha (Lyα) emission is one of the most important spectral features for probing the CGM at high redshifts\, providing crucial insights into the formation and evolution of galaxies and their environments in the early Universe. This emission can trace outflows\, inflows\, and other processes that are key to understanding how galaxies interact with their surroundings. However\, the origin of Lyα emission around quasars still under debate\, particularly in terms of whether the emission arises primarily from photoionized gas\, from cooling gas in the CGM\, or from processes related to quasar-driven outflows. These different scenarios have profound implications for our understanding of galaxy formation and evolution\, as they can shed light on feedback mechanisms\, gas accretion\, and the impact of quasars on their host galaxies. In this talk\, I will present a study of extended Lyα emission around quasars at z>2 utilizing the capabilities of the Javalambre Physics of the Accelerating Universe Astrophysical Survey (J-PAS) with its 54 optical narrow-band filters over thousands of degrees. I will highlight our recent discovery of a massive Lyα nebula using J-PAS early data release\, demonstrating the unique ability of J-PAS’s multi-band photometry to detect faint\, extended structures\, providing new perspectives on the dynamic relationship between quasars and their environments at high redshift.
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-by-rahna-payyasseri-thanduparackal-cefca-teruel/
LOCATION:Observatoire
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20250708T140000
DTEND;TZID=Europe/Paris:20250708T153000
DTSTAMP:20260510T114018
CREATED:20250702T094536Z
LAST-MODIFIED:20250702T094536Z
UID:8074-1751983200-1751988600@cral.osu-lyon.fr
SUMMARY:CRAL@ENS Seminar Valentin Le Gouellec
DESCRIPTION:Title : Evolution of embedded protostars studied with submillimeter and near-infrared observations \nAbstract : \nSun-like stars are thought to accrete most of their final mass during the protostellar phase\, where the protostellar embryo is surrounded by an infalling dense envelope. The so-called Class 0 phase designates the youngest protostellar stage\, where the accretion is thought to be the most vigorous. Several of the final outcome of star-disk systems (multiplicity\, stellar parameters\, disk properties) are thought to originate from this protostellar phase. I will present several aspects of the processes that are thought to be at play during this phase\, using both observations (ALMA\, JWST\, Keck) and modeling tools (MHD simulations\, radiative transfer). In the (sub-) millimeter\, ALMA reveals the detailed structure of magnetic field lines in the inner envelope of collapsing protostars via the observation of the linear polarization of thermal dust emission.\nWe examine the potential role of magnetic fields in controlling the mass infall rate and governing the evolution of the nascent circumstellar disk.\nOne question we seek to answer is whether more disorganized magnetic fields and infalling density structures correspond to higher probability of variable accretion and/or fragmentation.\nModeling of these structures via simulations and radiative transfer calculations of dust polarized emission also allows us to explore the properties of aligned dust grains in young protostellar envelopes\, where we tend to probe early dust grain evolution.\nWe will complete this view of protostellar accretion/ejection with recent near-IR observations of Class 0 protostars. In rare cases the blueshifted cavity created by the outflow is sufficiently close to pole-on to liberate enough near-infrared scattered light for us to probe the immediate surroundings of the central object. Bry\, several H$_2$ and CO overtone lines are detected and analyzed. Detecting Bry in several sources suggests a good fraction but not all of Class 0s accrete via magnetospheric accretion. A significant higher fraction of Class 0 objects tend to exhibit the CO overtone bands in emission than in archival K-band spectra of later-evolved\, Class I protostars\, confirming that the mass accretion rate is on average higher in the most embedded phase. Recent JWST observations and their synergy with ALMA are constraining even further the accretion/ejection mechanisms and disk formation processes of young protostars. They allow a complete study of molecular and ionized gas excitation and kinematics in the vicinity of protostars. Analyzing these properties toward the most embedded protostars\, whose IR spectra is now unveiled thanks to the sensitivity of JWST\, shall sharpen our understanding of the evolution of accretion and ejection mechanisms with time.
URL:https://cral.osu-lyon.fr/event/cralens-seminar-valentin-le-gouellec/
LOCATION:ENS
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20250912T110000
DTEND;TZID=Europe/Paris:20250912T120000
DTSTAMP:20260510T114018
CREATED:20250908T093541Z
LAST-MODIFIED:20250915T083737Z
UID:8105-1757674800-1757678400@cral.osu-lyon.fr
SUMMARY:CRAL@ENS Seminar - David Whitworth
DESCRIPTION:David Whitworth is a new postdoc at the ENS.
URL:https://cral.osu-lyon.fr/event/cralens-seminar-david-whitworth/
LOCATION:ENS
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20250923T110000
DTEND;TZID=Europe/Paris:20250923T120000
DTSTAMP:20260510T114018
CREATED:20250908T142403Z
LAST-MODIFIED:20250917T123416Z
UID:8109-1758625200-1758628800@cral.osu-lyon.fr
SUMMARY:CRAL@ENS Seminar - Clement Bonnerot (University of Birmingham)
DESCRIPTION:Unleashing the predictive power of tidal disruption events\nThe tidal force from a supermassive black hole can disrupt a star passing too close\, resulting in a powerful electromagnetic flare as the stellar debris fuels the compact object. Such tidal disruption events provide a unique window into the otherwise hidden population of quiescent supermassive black holes and can offer clues to the mystery of their formation mechanism in the early Universe. With the advent of the Rubin Observatory\, we are entering an observational golden era with thousands of events expected to be discovered\, increasing our current sample by two orders of magnitude. Fully exploiting this potential requires a robust theoretical framework that characterizes the observational signatures produced and links them to the properties of the black hole and disrupted star. I will present progress toward this goal\, which relies on a suite of interlinked simulations to follow the entire evolution of tidal disruption events and predict their electromagnetic emission.
URL:https://cral.osu-lyon.fr/event/cralens-seminar-clement-bonnerot/
LOCATION:ENS
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20250925T140000
DTEND;TZID=Europe/Paris:20250925T163000
DTSTAMP:20260510T114018
CREATED:20250618T142341Z
LAST-MODIFIED:20250618T142341Z
UID:8035-1758808800-1758817800@cral.osu-lyon.fr
SUMMARY:HDR defense Jérémy Fensch @ ENS
DESCRIPTION:En Salle des thèse à l’ENS.
URL:https://cral.osu-lyon.fr/event/hdr-defense-jeremy-fensch-ens/
LOCATION:ENS
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20250926T110000
DTEND;TZID=Europe/Paris:20250926T120000
DTSTAMP:20260510T114018
CREATED:20250908T142513Z
LAST-MODIFIED:20250917T123240Z
UID:8111-1758884400-1758888000@cral.osu-lyon.fr
SUMMARY:CRAL@ENS Seminar - Stefanie Walch-Gassner (University of Cologne)
DESCRIPTION:The impact of stellar feedback on galaxies\nSmall-scale stellar feedback can impact the large-scale evolution of galaxies by regulating star formation and by driving galactic fountain flows and outflows. Using modern high-performance computing simulations\, we can study the relative importance of stellar winds\, radiation\, and supernovae in shaping the multi-phase interstellar medium. Using these simulations\, we find that pre-supernova feedback is highly relevant for regulating star formation. In particular\, the ionizing radiation of massive stars is dominating over the impact of non-ionizing radiation or stellar winds. On the other hand\, supernovae drive hot bubbles and super-bubbles with substantially higher pressure than the typical midplane pressure of a disk galaxy\, thereby pushing gas out into the circum-galactic medium. Additionally\, cosmic rays\, which are in this context most importantly accelerated by supernova shocks\, help to sustain the galactic outflow via a vertical cosmic ray pressure gradient.
URL:https://cral.osu-lyon.fr/event/cralens-seminar-steffi-walch/
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:20251008T110000
DTEND;TZID=Europe/Paris:20251008T120000
DTSTAMP:20260510T114018
CREATED:20250915T083255Z
LAST-MODIFIED:20251001T090705Z
UID:8126-1759921200-1759924800@cral.osu-lyon.fr
SUMMARY:CRAL@Obs Seminar - Jenny Wagner (Helsinki Institute of Physics)
DESCRIPTION:Title: From cosmic lasagna to space-time spaghetti — obtaining the least-model-dependent strong gravitational lensing probe \n \nAbstract: Strong gravitational lensing has advanced as a standard probe to map mass densities of cosmic structures or to try and infer parameters of the cosmological concordance model\, like the Hubble Constant.\nIn this talk\, I will introduce those properties of a light-deflecting cosmic structure that can be uniquely and directly determined from observables without any lens model assumptions. These properties constitute the maximum information common to all model-based mass maps and require less than a second of computing time [1]. The derivation of these characteristics also reveals the most general class of lensing degeneracies and a simple physical interpretation of their origins [2]. \nI will showcase the power of this approach in two galaxy clusters: we can infer a least-model-dependent smoothness scale for dark matter\, reconstruct the morphology of the lensed source galaxy\, and even infer global properties of the lensing cluster in combination with complementary data [3\,4]. Thus\, with an increasing amount of data\, this approach will allow us to gain a deeper understanding of the _necessary_ amount and properties of dark matter in cosmic structures. \nReferences:\n[1] https://arxiv.org/abs/1906.05285\n[2] https://arxiv.org/abs/1809.03505\, https://arxiv.org/abs/1904.07239\, https://arxiv.org/abs/2203.06190\n[3] https://arxiv.org/abs/2105.04562\, https://arxiv.org/abs/2207.01630\n[4] https://arxiv.org/abs/2306.11779
URL:https://cral.osu-lyon.fr/event/cralobs-seminar-jenny-wagner-tbc/
LOCATION:Observatoire
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251010T110000
DTEND;TZID=Europe/Paris:20251010T120000
DTSTAMP:20260510T114018
CREATED:20250915T083413Z
LAST-MODIFIED:20250917T123051Z
UID:8128-1760094000-1760097600@cral.osu-lyon.fr
SUMMARY:CRAL@ENS Seminar - Henrik Beuther (MPIA Heidelberg)
DESCRIPTION:
URL:https://cral.osu-lyon.fr/event/cralens-seminar-henrik-beuther-mpia-heidelberg/
LOCATION:ENS
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251017T110000
DTEND;TZID=Europe/Paris:20251017T120000
DTSTAMP:20260510T114018
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:20260510T114018
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:20260510T114018
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
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251205T110000
DTEND;TZID=Europe/Paris:20251205T120000
DTSTAMP:20260510T114018
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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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251212T110000
DTEND;TZID=Europe/Paris:20251212T130000
DTSTAMP:20260510T114018
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:20260510T114018
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:20260510T114018
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
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260313T110000
DTEND;TZID=Europe/Paris:20260313T120000
DTSTAMP:20260510T114018
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:20260510T114018
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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END:VEVENT
END:VCALENDAR