A5076194387- Astro and Planetary Science
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Space Exploration and Technology
- Isotope Analysis in Ecology
- Methane Hydrates and Related Phenomena
- Spacecraft and Cryogenic Technologies
- Atmospheric Ozone and Climate
- Astronomy and Astrophysical Research
- High-pressure geophysics and materials
- Molecular Spectroscopy and Structure
- Geology and Paleoclimatology Research
- Scientific Research and Discoveries
- Geomagnetism and Paleomagnetism Studies
- Gamma-ray bursts and supernovae
- Space Science and Extraterrestrial Life
- Astronomical Observations and Instrumentation
- Geological and Geochemical Analysis
- Astronomical and nuclear sciences
- Solar and Space Plasma Dynamics
- Spacecraft Design and Technology
- Ionosphere and magnetosphere dynamics
- Nuclear Physics and Applications
- Atmospheric and Environmental Gas Dynamics
Centre National de la Recherche Scientifique
2016-2025
Aix-Marseille Université
2016-2025
Laboratoire d’Astrophysique de Marseille
2016-2025
Château Gombert
2015-2025
Institut Universitaire de France
2022-2025
Centre National d'Études Spatiales
2022
Jet Propulsion Laboratory
2021
Interface (United States)
2009-2020
Observatoire des Sciences de l’Univers Terre Homme Environnement Temps Astronomie
2006-2019
Institut UTINAM
2007-2018
The detection of glycine and phosphorus in the coma 67P shows that comets contain all ingredients to help spark life on Earth.
The provenance of water and organic compounds on Earth other terrestrial planets has been discussed for a long time without reaching consensus. One the best means to distinguish between different scenarios is by determining deuterium-to-hydrogen (D/H) ratios in reservoirs comets Earth’s oceans. Here, we report direct situ measurement D/H ratio Jupiter family comet 67P/Churyumov-Gerasimenko ROSINA mass spectrometer aboard European Space Agency’s Rosetta spacecraft, which found be (5.3 ± 0.7)...
We report the orbital distribution of trans-Neptunian objects (TNOs) discovered during Canada–France Ecliptic Plane Survey (CFEPS), whose discovery phase ran from early 2003 until 2007. The follow-up observations started just after first discoveries and extended late 2009. obtained characterized 321 deg2 sky to depths in range g ∼ 23.5–24.4 AB mag. provide a database 169 TNOs with high-precision dynamical classification known efficiency. Using this database, we find that classical belt is...
Comets contain the best-preserved material from beginning of our planetary system. Their nuclei and comae composition reveal clues about physical chemical conditions during early solar system when comets formed. ROSINA (Rosetta Orbiter Spectrometer for Ion Neutral Analysis) onboard Rosetta spacecraft has measured coma comet 67P/Churyumov-Gerasimenko with well-sampled time resolution per rotation. Measurements were made over many rotation periods a wide range latitudes. These measurements...
Molecular nitrogen (N2) is thought to have been the most abundant form of in protosolar nebula. It main N-bearing molecule atmospheres Pluto and Triton probably reservoir from which giant planets formed. Yet comets, often considered primitive bodies solar system, N2 has not detected. Here we report direct situ measurement Jupiter family comet 67P/Churyumov-Gerasimenko, made by Rosetta Orbiter Spectrometer for Ion Neutral Analysis mass spectrometer aboard spacecraft. A N2/CO ratio (5.70 ±...
The origin of cometary matter and the potential contribution comets to inner-planet atmospheres are long-standing problems. During a series dedicated low-altitude orbits, Rosetta Orbiter Spectrometer for Ion Neutral Analysis (ROSINA) on spacecraft analyzed isotopes xenon in coma comet 67P/Churyumov-Gerasimenko. isotopic composition shows deficits heavy matches that primordial atmospheric component. present-day Earth atmosphere contains 22 ± 5% xenon, addition chondritic (or solar) xenon.
Abstract The MAss Spectrometer for Planetary EXploration (MASPEX) is a high-mass-resolution, high-sensitivity, multi-bounce time-of-flight mass spectrometer (MBTOF) capable of measuring minor species with abundances sub-parts-per-million in Europa’s sputter-produced and radiolytically modified exosphere its oceanic plumes. goal the MASPEX-Europa investigation to determine, through in-situ measurement plume composition, whether conditions habitability exist or have existed on Europa. As...
Abstract The JUpiter ICy moons Explorer (JUICE) of ESA was launched on 14 April 2023 and will arrive at Jupiter its in July 2031. In this review article, we describe how JUICE investigate the interior three icy Galilean moons, Ganymede, Callisto Europa, during orbital tour final phase around Ganymede. Detailed geophysical observations about can only be performed from close distances to best estimates signatures interior, such as an induced magnetic field, tides rotation variations, radar...
Using an evolutionary model of the solar nebula, we fit all enrichments in volatiles with respect to abundance measured Jupiter by Galileo probe. We argue that were trapped form solid clathrate hydrates cooling feeding zone while gas mass nebula was continuously decreasing time. Enrichments are those acquired planetesimals at time hydrodynamic collapse zone. The O/H ratio is predicted be least 8 times solar.
Terrestrial planets in the solar system, such as Earth, are oxygen-rich, with silicates and iron being most common minerals their interiors. However, true chemical diversity of rocky orbiting other stars is yet unknown. Mass radius measurements used to constrain interior compositions super-Earths (exoplanets masses 1 - 10 Earth masses), typically interpreted planetary models that assume Earth-centric oxygen-rich compositions. Using models, super-Earth 55 Cancri e (mass 8 masses, 2 radii) has...
The recent inference of a carbon-rich atmosphere, with C/O >= 1, in the hot Jupiter WASP-12b motivates exotic new class planets (CRPs). We report detailed study atmospheric chemistry and spectroscopic signatures giant (CRGs) compositions icy planetesimals required for their formation, apportionment ices, rock, volatiles envelopes. For most oxygen is occupied by CO T > 1400 K pressure (P) < 1 bar, causing substantial depletion H2O, an overabundance CH4 compared to those obtained assuming...
Serpentinization involves the hydrolysis and transformation of primary ferromagnesian minerals such as olivine ((Mg,Fe)2SiO4) pyroxenes ((Mg,Fe)SiO3) to produce H2-rich fluids a variety secondary over wide range environmental conditions. The continual elevated production H2 is capable reducing carbon, thus initiating an inorganic pathway organic compounds. H2-dependent CH4 in serpentinization systems has received significant interdisciplinary interest, especially with regard abiotic...
We present an analysis of seven primary transit observations the hot Neptune GJ436b at 3.6, 4.5, and 8 μm obtained with Infrared Array Camera on Spitzer Space Telescope. After correcting for systematic effects, we fitted light curves using Markov Chain Monte Carlo technique. Combining these new data EPOXI, Hubble Telescope, ground-based V, I, H, Ks published observations, range 0.5–10 can be covered. Due to low level activity GJ436, effect starspots combination transits different epochs is...
Small planets ($\sim$1--3.9 $\Rearth$) constitute more than half of the inventory 4000-plus exoplanets discovered so far. Smaller are sufficiently dense to be rocky, but those with radii larger $\sim$1.6 $\Rearth$ thought display in many cases hydrogen/helium gaseous envelopes up $\sim$30\% planetary mass. These low-mass highly irradiated and question their origin, evolution, possible links remains open. Here we show that close-in ocean affected by greenhouse effect hydrospheres...
ROSINA/DFMS shows that comets of type 67P/CG likely did not significantly contribute to Earth’s volatile budget.
Meteorites have long been considered as reflections of the compositional diversity main belt asteroids and consequently they used to decipher their origin, formation, evolution. However, while some meteorites are known sample surfaces metallic, rocky hydrated (about one-third mass belt), low-density icy (C-, P-, D-types), representing rest belt, appear be unsampled in our meteorite collections. Here we provide conclusive evidence that surface compositions these bodies compatible with those...
Abstract Modeling the interior of exoplanets is essential to go further than conclusions provided by mean density measurements. In addition still limited precision on planets’ fundamental parameters, models are existence degeneracies their compositions. Here, we present a model internal structure dedicated study solid planets up ∼10 Earth masses, i.e., super-Earths. When measurement available, assumption that bulk Fe/Si ratio planet similar its host star allows us significantly reduce...