Bd de l'Observatoire

Jul 12, 2024 | academic.oup.com | Université Côte d'Azur |Laboratoire Lagrange |Bd de l'Observatoire |Observatoire de Paris

The ultimate science case for observing Earth-like planets orbiting stars in their habitable zone requires image contrast in visible light on the order of at short orbits from the host star. To address this goal, a leading approach combines high-performance coronagraphy and wavefront shaping to reduce starlight and generate a dark region within the image, enhancing the exoplanet signal to noise. Coronagraphs are designed to suppress diffracted light but require exquisite image quality.

Mar 22, 2024 | pubs.aip.org | Université Côte d'Azur |Laboratoire Lagrange |Bd de l'Observatoire |Samuel E. Wurzel

Topics Non linear dynamics, Magnetization dynamics, Magnetic reconnection, Plasma instabilities Magnetic reconnection plays an important role in various space-plasma phenomena, from solar flares to geomagnetic storms.

Mar 22, 2024 | link.aps.org | Giorgio Krstulovic |Université Côte d'Azur |Laboratoire Lagrange |Bd de l'Observatoire

In this paper, we study numerically the temporal evolution of an initially random large-scale velocity field governed by the hyperviscous incompressible Navier-Stoke equations. Three stages are clearly observed during the evolution. First, the initial condition development is characterized by a spectrum evolving in a self-similar way with a wave number front k*(t) propagating toward high values exponentially in time.