Observatoire de Paris Institut national de recherche scientifique français Univerité Pierre et Marie Curie Université Paris Diderot - Paris 7

Sauf exception, les séminaires ont lieu sur le site de Meudon, dans la salle de conférence du bâtiment 17.

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Prochains séminaires

  • Lundi 3 octobre 2022 à 16h00 (Salle de conférence du bâtiment 17)

    The Dragonfly landing site seen by the Cassini RADAR

    Léa Bonnefoy (Cornell University)

    The Selk crater region is the future landing site of NASA’s Dragonfly mission to Titan. The region was imaged by the Cassini RADAR at incidence angles from 5° to 72° and at various polarization angles. Using this data set, we assembled backscatter curves for six terrains. By fitting different models to these data we derived new composition and roughness constraints for each terrain. Topography from radarclinometry also revealed a non-uniform crater rim, less eroded than previously thought.


Séminaires passés

  • Jeudi 29 septembre 2022 à 16h00 (Salle de réunion du bâtiment 16 et visioconférence)

    Data reduction and inverse problem approaches - An efficient (and cheap) way to push the instrumental limits

    Anthony BERDEU (LESIA)

    Study of astrophysical objects requires always more complex models (black hole surrounding, exoplanet atmosphere, accretion disk, galaxy formation and evolution, …) whose inputs imply always more precise measurements. On the other side, the astronomical instruments start to reach their fundamental limits (negligible sensor readout noise, precise mirror polishing, technologies harder to scale up to extremely large telescopes, …). During my talk, I will discuss how data science applied for optimal data reduction and processing via inverse problem approaches can bridge this gap, by pushing the experimental limits without the need of further instrumental developments. I will introduce different applications of my research : integral field spectroscopy (SPHERE/IFS), blind deconvolution and PSF reconstruction (SPHERE/ZIMPOL) and extreme adaptative optics for coronagraph (Evanescent Wave Coronagraph, EvWaCo).

    Lien pour assister au séminaire :
    https://us02web.zoom.us/j/81014804473?pwd=OUF3OUJDU1ZNTlNBYnVPR0ZmRGxqUT09