A5019049823- Astro and Planetary Science
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Astrophysics and Star Formation Studies
- Nuclear physics research studies
- Geology and Paleoclimatology Research
- Nuclear Physics and Applications
- Stellar, planetary, and galactic studies
- Mass Spectrometry Techniques and Applications
- Atomic and Molecular Physics
- Ion-surface interactions and analysis
- High-pressure geophysics and materials
- Gamma-ray bursts and supernovae
- Astronomical and nuclear sciences
- Polar Research and Ecology
- Advanced Chemical Physics Studies
- Geological and Geochemical Analysis
- Space Science and Extraterrestrial Life
- Molecular Spectroscopy and Structure
- Space Exploration and Technology
- Quantum Chromodynamics and Particle Interactions
- Solar and Space Plasma Dynamics
- Cryospheric studies and observations
- Diamond and Carbon-based Materials Research
- Paleontology and Stratigraphy of Fossils
Institut de minéralogie, de physique des matériaux et de cosmochimie
2020-2024
Sorbonne Université
2020-2024
Laboratoire de Minéralogie & Cosmochimie du Muséum
2022-2024
Centre National de la Recherche Scientifique
2015-2024
Institut National de Physique Nucléaire et de Physique des Particules
2014-2024
Université Paris-Saclay
2015-2024
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2020-2024
Muséum national d'Histoire naturelle
2021-2023
Université Paris-Sud
2008-2022
Center for Astrophysics Harvard & Smithsonian
2021
Samples of the carbonaceous asteroid Ryugu were brought to Earth by Hayabusa2 spacecraft. We analyzed 17 samples measuring 1 8 millimeters. Carbon dioxide-bearing water inclusions are present within a pyrrhotite crystal, indicating that Ryugu's parent formed in outer Solar System. The contain low abundances materials at high temperatures, such as chondrules and calcium- aluminum-rich inclusions. rich phyllosilicates carbonates, which through aqueous alteration reactions temperature, pH,...
Samples of the carbonaceous asteroid (162173) Ryugu were collected and brought to Earth by Hayabusa2 spacecraft. We investigated macromolecular organic matter in samples found that it contains aromatic aliphatic carbon, ketone, carboxyl functional groups. The spectroscopic features are consistent with those chemically primitive chondrite meteorites experienced parent-body aqueous alteration (reactions liquid water). morphology carbon includes nanoglobules diffuse associated phyllosilicate...
The neutron-rich (66,68)Ni have been produced at GANIL via interactions of a 65.9A MeV 70Zn beam with 58Ni target. Their reduced transition probability B(E2;0(+)(1)-->2+) has measured for the first time by Coulomb excitation in (208)Pb target intermediate energy. B(E2) value (68)Ni(40) is unexpectedly small. An analysis terms large scale shell model calculations stresses importance proton core excitations to reproduce values and indicates erosion N = 40 harmonic-oscillator subshell...
Primitive interplanetary dust is expected to contain the earliest solar system components, including minerals and organic matter. We have recovered, from central Antarctic snow, ultracarbonaceous micrometeorites whose matter contains extreme deuterium (D) excesses (10 30 times terrestrial values), extending over hundreds of square micrometers. identified crystalline embedded in micrometeorite matter, which suggests that this reservoir could formed within itself rather than having direct...
The annual flux of extraterrestrial material on Earth is largely dominated by sub-millimetre particles. mass distribution and absolute value this cosmic dust at the Earth's surface however still uncertain due to difficulty in monitoring both collection efficiency exposure parameter (i.e. area-time product m2.yr). In paper, we present results from micrometeorite collections originating vicinity CONCORDIA Station located Dome C (Antarctica), where performed several independent melts large...
Context. A 3.4 μm absorption band (around 2900 cm-1), assigned to aliphatic C-H stretching modes of hydrogenated amorphous carbons (a-C:H), is widely observed in the diffuse interstellar medium, but disappears or modified dense clouds. This spectral difference between different phases medium reflects processing dust environments. Cosmic ray bombardment one processes that make carbonaceous evolve.
Aims. The goal of this study is to simulate space weathering processes on primitive bodies. We use ion implantation as a simulation solar wind irradiation, which has been suggested by several authors be the major component main belt asteroids. laboratory analogs we irradiate and analyze are carbonaceous chondrites; started with Allende CV meteorite in companion paper present results Murchison CM meteorite.
The ^{12}C+^{12}C fusion reaction plays a critical role in the evolution of massive stars and also strongly impacts various explosive astrophysical scenarios. presence resonances this at energies around below Coulomb barrier makes it impossible to carry out simple extrapolation down Gamow window-the energy regime relevant carbon burning stars. system forms unique laboratory for challenging contemporary picture deep sub-barrier (possible hindrance) its interplay with nuclear structure...
Galactic cosmic-rays (GCRs) are thought to be accelerated in strong shocks induced by massive star winds and supernova explosions sweeping across the interstellar medium. But phase of medium from which CRs extracted has remained elusive until now. Here, we study detail GCR source composition deduced recent measurements AMS-02, Voyager 1 SuperTIGER experiments obtain information on composition, ionisation state dust content reservoirs. We show that volatile elements CR material mainly a...
Context. The current period is conducive to exploring our Solar System's origins with recent and future space sample return missions, which provide invaluable information from known System asteroids comets Hayabusa2 mission of the Japan Aerospace Exploration Agency (JAXA) recently brought back samples surface Ryugu carbonaceous asteroid. Aims. We aim identify different forms chemical composition organic matter minerals that constitute these primitive objects, shed light on origins. Methods....
Abstract Transmission electron microscopy analyses of Hayabusa2 samples show that Ryugu organic matter exhibits a range morphologies, elemental compositions, and carbon functional chemistries consistent with those carbonaceous chondrites have experienced low‐temperature aqueous alteration. Both nanoglobules diffuse are abundant. Non‐globular particles also present, including some contain nanodiamond clusters. Diffuse is finely distributed in around phyllosilicates, forms coatings on other...
Abstract— We discuss the relationship between large cosmic dust that represents main source of extraterrestrial matter presently accreted by Earth and samples from comet 81P/Wild 2 returned Stardust mission in January 2006. Prior examinations have shown Wild cometary particles contain a diversity components, formed at various heliocentric distances. These analyses suggest large‐scale radial mixing mechanism(s) early solar nebula existence continuum primitive asteroidal matter. The recent...
Context. UltraCarbonaceous Antarctic MicroMeteorites (UCAMMs) represent a small fraction of interplanetary dust particles reaching the Earth’s surface and contain large amounts an organic component not found elsewhere. They are most probably sampling contribution from outer regions solar system to local particle (IDP) flux. Aims. We characterize UCAMMs composition focusing on matter, compare results insoluble matter (IOM) primitive meteorites, IDPs, Earth. Methods. acquired synchrotron...
Abstract We have conducted a NanoSIMS-based search for presolar material in samples recently returned from C-type asteroid Ryugu as part of JAXA's Hayabusa2 mission. report the detection all major grain types with O- and C-anomalous isotopic compositions typically identified carbonaceous chondrite meteorites: 1 silicate, oxide, O-anomalous supernova ambiguous phase, 38 SiC, 16 grains. At least two grains are graphites, whereas several moderate C anomalies probably organics. The silicate was...
The structure of neutron-rich 40,42,44S nuclei has been investigated through in-beam γ-ray spectroscopy using the fragmentation reaction a 60 MeV A 48Ca beam on thin Be target. Eγ, Iγ, γγ-coincidence, and angular distributions were measured for each produced fragment. level schemes previously containing only single γ transition extended, spin values proposed new states. experimental results interpreted by use microscopic collective-model large-scale shell-model calculations. model...
Abstract– We report a multi‐wavelength Raman spectroscopy study of carbonaceous matter in 38 Antarctic micrometeorites (AMMs) from the 2006 CONCORDIA collection. The particles were selected as function their degree thermal alteration developed during deceleration atmosphere. These samples range unmelted (fine‐grained—Fg; ultracarbonaceous—UCAMMs) to partially melted AMMs (scorias—Sc) and completely (cosmic spherules—CS). More than half analyzed contain substantial amount polyaromatic with...
Establishing the origin of short-lived radionuclide (SLR) 26-Al, which was present in refractory inclusions primitive meteorites, has profound implications for astrophysical context solar system formation. Recent observations that 26-Al homogeneously distributed inner prove this SLR a stellar origin. In Letter, we address issue incorporation hot 26-Al-rich ejecta into cold protosolar nebula. We first show atoms produced by population massive stars an OB association cannot be injected...