A5079098346- Planetary Science and Exploration
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
- Astronomy and Astrophysical Research
- Space Exploration and Technology
- Scientific Research and Discoveries
- Atmospheric and Environmental Gas Dynamics
- Atmospheric aerosols and clouds
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Calibration and Measurement Techniques
- Spacecraft Design and Technology
- Space Science and Extraterrestrial Life
- Astronomical Observations and Instrumentation
- Isotope Analysis in Ecology
- Astrophysics and Star Formation Studies
- Methane Hydrates and Related Phenomena
- Spectroscopy and Laser Applications
- Ionosphere and magnetosphere dynamics
- Spacecraft and Cryogenic Technologies
- Spaceflight effects on biology
- Light effects on plants
- ICT Impact and Policies
- Superconducting and THz Device Technology
Centre National de la Recherche Scientifique
2020-2023
Laboratoire atmosphères, milieux, observations spatiales
2015-2023
Institut Pierre-Simon Laplace
2020-2023
Université de Versailles Saint-Quentin-en-Yvelines
2020-2022
Sorbonne Université
2020-2022
Université Paris-Saclay
2020-2022
Delft University of Technology
2017-2018
Faculty (United Kingdom)
2017
University of Liège
2013
Spinal cord injury triggers irreversible loss of motor and sensory functions. Numerous strategies aiming at repairing the injured spinal have been studied. Among them, use bone marrow-derived mesenchymal stem cells (BMSCs) is promising. Indeed, these possess interesting properties to modulate CNS environment allow axon regeneration functional recovery. Unfortunately, BMSC survival differentiation within host remain poor, found various adverse effects when grafted in other pathological...
Earth-like, potentially habitable exoplanets are prime targets in the search for extraterrestrial life. Information about their atmosphere and surface can be derived by analyzing light of parent star reflected planet. We investigate influence albedo $A_{\rm s}$, optical thickness $b_{\rm cloud}$ altitude water clouds, mixing ratio $\eta$ biosignature O$_2$ on strength A-band (around 760 nm) flux polarization spectra starlight Earth-like exoplanets. Our computations horizontally homogeneous...
Context. Clouds have already been detected in exoplanetary atmospheres. They play crucial roles a planet's atmosphere and climate can also create ambiguities the determination of atmospheric parameters such as trace gas mixing ratios. Knowledge cloud properties is required when assessing habitability planet.
PyMieDAP (the Python Mie Doubling-Adding Programme) is a Python--based tool for computing the total, linearly, and circularly polarized fluxes of incident unpolarized sun- or starlight that reflected by, respectively, Solar System planets moons, exoplanets at range wavelengths. The radiative transfer computations are based on an adding--doubling Fortran algorithm fully include polarization all orders scattering. model (exo)planets described by atmosphere composed stack homogeneous layers...
Abstract HDO and the D/H ratio are essential to understand Mars past present climate, in particular with regard evolution through ages of Martian water cycle. We here new modeling developments cycle Laboratoire de Météorologie Dynamique Global Climate Model (GCM). The study aims at exploring behavior its sensitivity ice clouds formulation fractionation by condensation. Our GCM simulations compared observations provided Atmospheric Chemistry Suite (ACS) on board ESA/Roscosmos Trace Gas...
Abstract The deuterium to hydrogen (D/H) ratio is commonly used investigate the history of water on Mars, yet mechanisms controlling present‐day HDO behavior are poorly understood. Significant variations D/H were first predicted basis a 3D global climate model, which later confirmed by ground‐based observations. This behavior, consisting lower HDO/H 2 O ratios in colder regions related isotopic fractionation occurring at condensation. We leverage this previous effort and present an updated...
Abstract The D/H ratio and its implications on the atmospheric escape, make it an essential observable to study current past inventory of water Mars. With arrival Trace Gas Orbiter around Mars, new measurements are now available require tools interpret observations understand HDO cycle. We here present simulations updated version Laboratoire de Météorologie Dynamique Mars Global Climate Model which includes in particular fractionation processes undergoes. compare our model with solar...
Understanding the total flux and polarization signals of Earth-like planets their spectral temporal variability is essential for future characterization such exoplanets. We provide computed (F) linearly (Q U) circularly (V) polarized fluxes, degree P sunlight that reflected by a model Earth, to be used instrument designs, optimizing observational strategies, and/or developing retrieval algorithms. modeled realistic planet using one year daily Earth-observation data: cloud parameters...
The circular polarization of light that planets reflect is often neglected because it very small compared to the linear polarization. It could, however, provide information on a planet's atmosphere and surface, presence life, homochiral molecules are building blocks life Earth known circularly polarized light. We compute $P_c$, degree polarization, for reflected by rocky (exo)planets with liquid water or sulfuric acid solution clouds, both spatially resolved across planetary disk and, patchy...
Exposed scarps images and ice-penetrating radar measurements in the North Polar Layered Deposits (NPLD) of Mars show alternating layers that provide an archive past climate oscillations, are thought to be linked orbital variations, akin Milankovitch cycles on Earth. We use Laboratoire de Meteorologie Dynamique (LMD) Martian Global Climate Model (GCM) study paleoclimate states enable a better interpretation NPLD physical chemical stratigraphy. When tropical ice reservoir is present, water...
Context. Detecting moons around exoplanets is a major goal of current and future observatories. Moons are suspected to influence rocky exoplanet habitability, gaseous in stellar habitable zones could harbor abundant diverse target the search for extraterrestrial habitats. Exomoons contribute exoplanetary signals but virtually undetectable with methods. Aims. We identify analyze traces exomoons temporal variation total polarized fluxes starlight reflected by an Earth-like its spatially...
Abstract The polarization state of starlight reflected by a planetary atmosphere uniquely reveals coverage, particle size, and composition aerosols as well changing cloud patterns. It is not possible to obtain comparable level detail from flux-only observations. therefore powerful tool better understand the crucial role played clouds in chemistry, dynamics, radiative balance planet. Furthermore, observations can probe planets independently orbital geometry (hence it applies both transiting...
Terrestrial exoplanets in habitable zones are ubiquitous. It is, however, unknown which have Earth-like or Venus-like climates. Distinguishing different planet-types is crucial for determining whether a planet could be habitable. We investigate the potential of polarimetry distinguishing exo-Earths from exo-Venuses. present computed fluxes and polarisation starlight that reflected by with atmospheres evolutionary states current Earth to Venus, cloud compositions ranging pure water 0.75...
The polarization state of starlight reflected by a planetary atmosphere uniquely reveals coverage, particle size, and composition aerosols as well changing cloud patterns. It is not possible to obtain comparable level detailed from flux-only observations. Furthermore, observations can probe the planets independently orbital geometry (i.e., transiting non-transiting planets). We show that high-resolution spectropolarimeter with broad wavelength particularly if attached large space telescope,...
Abstract Planet-wide stationary gravity waves have been observed with the thermal camera on Akatsuki spacecraft. These attributed to underlying surface topography and successfully reproduced using Institut Pierre Simon Laplace (IPSL) Venus Mesoscale Model (VMM). Here, we use numerical radiative transfer computations of total polarized fluxes sunlight that is reflected by under conditions these show could also be in polarimetric observations. To model waves, density perturbations computed...
One of the most exciting scientific challenges is to detect Earth-like planets in habitable zones other stars galaxy and search for evidence life. The ability observe characterise dozens potentially now lies within realm possibility due rapid advances key space imaging technologies. associated challenge directly very faint orbit around nearby bright well understood, with instrumentation also being perfected developed. Such will allow us develop large transformative telescopes, covering a...