A5078614558- Astro and Planetary Science
- Planetary Science and Exploration
- Geomagnetism and Paleomagnetism Studies
- Geology and Paleoclimatology Research
- Magnetic and Electromagnetic Effects
- High-pressure geophysics and materials
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Earthquake Detection and Analysis
- Space Science and Extraterrestrial Life
- Geological and Geochemical Analysis
- Isotope Analysis in Ecology
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
- Astrophysics and Star Formation Studies
- Paleopathology and ancient diseases
- earthquake and tectonic studies
- Electromagnetic Fields and Biological Effects
- Astronomical Observations and Instrumentation
- Nuclear physics research studies
- Space exploration and regulation
- Geophysical and Geoelectrical Methods
- Space Satellite Systems and Control
- Spacecraft and Cryogenic Technologies
- High-Velocity Impact and Material Behavior
Centre de Recherche et d’Enseignement de Géosciences de l’Environnement
2022-2025
Aix-Marseille Université
2022-2025
Massachusetts Institute of Technology
2017-2025
Institut de Recherche Pour le Développement
2025
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2022-2025
Institut de Recherche pour le Développement
2022-2025
Centre National de la Recherche Scientifique
1985-2025
Centre d’études et de Recherches sur l’espace Germanophone
2023
Planetary Science Institute
2017-2022
University of California, Los Angeles
2022
The JAXA Hayabusa 2 mission returned 5.4 g of material from the C-type asteroid Ryugu. Mn-Cr ages dolomite in samples indicate that Ryugu's parent body experienced aqueous alteration sometimes between <1.8 and 6.8 Myr after CAI formation. Because this time range overlaps with lifetime solar nebula, we investigate possibility magnetite pyrrhotite, which are products found Ryugu samples, acquired a remanent magnetization reflecting nebula field intensity. We analyze intrinsic magnetic...
The Red Planet is a magnetic planet. Martian crust contains strong magnetization from core dynamo that likely was active during the Noachian period when surface may have been habitable. evolution of played central role in early atmosphere and planet's transition to current cold dry state. However, nature history crustal are poorly understood given lack well-preserved, oriented, ancient samples with geologic context available for laboratory study. Here, we describe how measurements returned...
Many if not most small asteroids are rubble piles covered by regolith, and perturbations may be enough to disturb their surfaces in complex ways due microgravity. Experiments study low-gravity regolith dynamics challenging, properly validated numerical simulations can provide valuable insights. In this paper, we investigate numerically size segregation among grains, which is likely occur after repeated shaking events. particular, interested the so-called Brazil-nut effect (BNE), i.e....
A broad spectrum of fully differentiated, partially melted, and possibly unmelted objects populated the early solar system.
Here we report on the significant role of a so far overlooked dynamical aspect, namely, secular resonance between dwarf planet Ceres and other asteroids. We demonstrate that this type can be dominant factor in certain regions main asteroid belt. Specifically, performed analysis asteroids belonging to (1726) Hoffmeister family. To identify which mechanisms are actually at work part belt, i.e., isolate perturber(s), study evolution family time. The is accomplished using numerical integrations...
Context. Landing on the surface of small bodies is particularly challenging, as physical properties material are not well known and mechanical response this in a low-gravity environment understood. Aims. In order to improve our understanding low-speed impact processes granular media their outcome environments, we consider landing package MASCOT, be released by JAXA asteroid sample return mission Hayabusa2 (162173) Ryugu October 2018. Beyond addressing theoretical aspects low gravity, study...
Magnetic fields in protoplanetary disks are thought to play a prominent role the formation of planetary bodies. Acting upon turbulence and angular momentum transport, they may influence motion solids accretion onto central star. By searching for record solar nebula field preserved meteorites, we aim characterize strength disk with spatial temporal resolution far superior observations extrasolar disks. Here, present rock magnetic paleomagnetic study andesite meteorite Erg Chech 002 (EC002)....
Abstract We present the outcome of search campaigns conducted in Catalina Dense Collection area (DCA) located central depression Atacama Desert, Chile. The “Catalina Systematic Collection” (CSC) was assembled through systematic on‐foot searches, resulting a total 1599 meteorites, before pairing, collected over surface 6.80 km 2 . This yielded recovery density 235 meteorites per (67 >20 g ), making it densest among hot deserts, even higher than neighboring El Médano DCA collection....
Abstract Meteorite paleomagnetic studies indicate planetesimal generated magnetic fields, but spacecraft measurements have yet to identify asteroidal natural remanent magnetization (NRM). This apparent discrepancy is of particular interest in the context NASA Psyche mission, which will search for evidence past activity metal‐rich asteroid (16) Psyche. Here, we aim test whether NRM meteorites inevitably drops below detectable values as specimen size increases, could explain why NRMs never be...
Abstract CI1 chondrites are rare meteorites with high scientific value. In fact, they the most chemically primitive and show evidence of intense parent‐body aqueous alteration. They also share strong similarities samples from Ryugu Bennu asteroids returned by JAXA Hayabusa2 NASA's OSIRIS‐REx missions. this work, we present a detailed study Oued Chebeika 002 meteorite, ~420 g chondrite found in Morocco 2024. We describe its petrography, texture, mineralogy, focus on clay mineralogy. provide...
Abstract Many meteorites experienced aqueous alteration on their parent body. During this process, magnetite usually forms and acquires a chemical remanent magnetization (CRM) if growing in the presence of magnetic field. The epoch planetesimals encompasses lifetime solar nebula. Therefore, magnetite‐bearing are potential sources invaluable data regarding intensity nebula field its influence planetary accretion. major limitation encountered meteorite paleomagnetic studies is lack an...
Abstract Paleomagnetic studies of meteorites provide unique constraints on the evolution magnetic fields in early solar system. These rely identification minerals that can retain stable magnetizations over ≳4.5 billion years (Ga). The ferromagnetic mineral tetrataenite (γ''‐Fe 0.5 Ni ) is found iron, stony‐iron and chondrite meteorite groups. Nanoscale intergrowths have been shown to carry records paleomagnetic fields, although effect magnetostatic interactions their remanence acquisition...
Abstract The existence of numerous iron meteorite groups indicates that some planetesimals underwent melting led to metal‐silicate segregation, sometimes producing metallic cores. Meteorite paleomagnetic records suggest crystallization these cores generated dynamo magnetic fields. Here we describe the history partially differentiated IIE parent body. This is first planetesimal for which have a time‐resolved record constrained by 40 Ar/ 39 Ar chronometry spanning several tens million years...
Abstract We consider the role of dwarf planet Ceres on secular dynamics asteroid main belt. Specifically, we examine post impact evolution families due to interaction their members with linear nodal resonance Ceres. First, find location this and identify which are crossed by its path. Next, summarize our results for three families, namely (1726) Hoffmeister, (1128) Astrid (1521) Seinajoki have irregular distributions in proper elements space, indicative effect resonance. confirm performing a...