Laurette Piani
A5003658817- Astro and Planetary Science
- Isotope Analysis in Ecology
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Geology and Paleoclimatology Research
- Nuclear Physics and Applications
- Paleontology and Stratigraphy of Fossils
- Molecular Spectroscopy and Structure
- Ion-surface interactions and analysis
- Spacecraft and Cryogenic Technologies
- Mineralogy and Gemology Studies
- Geotechnical and Geomechanical Engineering
- Astronomical and nuclear sciences
- Methane Hydrates and Related Phenomena
- Archaeology and ancient environmental studies
- Radioactive element chemistry and processing
- Glass properties and applications
- Space Science and Extraterrestrial Life
- Atmospheric Ozone and Climate
- Silicone and Siloxane Chemistry
- Metallurgical Processes and Thermodynamics
- Chemical Reactions and Isotopes
Centre de Recherches Pétrographiques et Géochimiques
2016-2024
Centre National de la Recherche Scientifique
2015-2024
Université de Lorraine
2016-2024
Osaka Health Science University
2024
Osaka University
2024
Hokkaido University
2016-2018
Sorbonne Université
2015
Institut de Recherche pour le Développement
2015
Institut de minéralogie, de physique des matériaux et de cosmochimie
2015
National Institutes of Natural Sciences
2015
The origin of Earth's water remains unknown. Enstatite chondrite (EC) meteorites have similar isotopic composition to terrestrial rocks and thus may be representative the material that formed Earth. ECs are presumed devoid because they in inner Solar System. is therefore generally attributed late addition a small fraction hydrated materials, such as carbonaceous meteorites, which originated outer System where was more abundant. We show EC contain sufficient hydrogen delivered Earth at least...
Carbonaceous meteorites are thought to be fragments of C-type (carbonaceous) asteroids. Samples the asteroid (162173) Ryugu were retrieved by Hayabusa2 spacecraft. We measured mineralogy and bulk chemical isotopic compositions samples. The samples mainly composed materials similar those carbonaceous chondrite meteorites, particularly CI (Ivuna-type) group. consist predominantly minerals formed in aqueous fluid on a parent planetesimal. primary altered fluids at temperature 37° ± 10°C, about...
Little is known about the origin of spectral diversity asteroids and what it says conditions in protoplanetary disk. Here, we show that samples returned from Cb-type asteroid Ryugu have Fe isotopic anomalies indistinguishable Ivuna-type (CI) chondrites, which are distinct all other carbonaceous chondrites. Iron isotopes, therefore, demonstrate CI chondrites formed a reservoir was different source regions asteroids. Growth migration giant planets destabilized nearby planetesimals ejected some...
The extraterrestrial materials returned from asteroid (162173) Ryugu consist predominantly of low-temperature aqueously formed secondary minerals and are chemically mineralogically similar to CI (Ivuna-type) carbonaceous chondrites. Here, we show that high-temperature anhydrous primary in chondrites exhibit a bimodal distribution oxygen isotopic compositions: 16O-rich (associated with refractory inclusions) 16O-poor chondrules). Both the probably inner solar protoplanetary disk were...
Preliminary analyses of asteroid Ryugu samples show kinship to aqueously altered CI (Ivuna-type) chondrites, suggesting similar origins. We report identification C-rich, particularly primitive clasts in that contain preserved presolar silicate grains and exceptional abundances SiC isotopically anomalous organic matter. The high abundance (104 ppm) indicates the clast escaped extensive alteration. 5 10 times higher (~235 ppm), N-rich matter, organics with N isotopic anomalies (1.2%), C (0.2%)...
The present-day nitrogen isotopic compositions of Earth's surficial (15N-enriched) and deep reservoirs (15N-depleted) differ significantly. This distribution can neither be explained by modern mantle degassing nor recycling via subduction zones. As the effect planetary differentiation on behavior N isotopes is poorly understood, we experimentally determined N-isotopic fractionations during metal-silicate partitioning (analogous to core formation) over a large range oxygen fugacities (ΔIW...
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...
Studies of material returned from Cb asteroid Ryugu have revealed considerable mineralogical and chemical heterogeneity, stemming primarily brecciation aqueous alteration. Isotopic anomalies could also been affected by delivery exogenous clasts mobilization soluble elements. Here, we show that isotopic for mildly Cr are highly variable in CI chondrites, whereas those Ti relatively uniform. This variation isotope ratios is most likely due to physicochemical fractionation between 54Cr-rich...
The isotopic compositions of samples returned from Cb-type asteroid Ryugu and Ivuna-type (CI) chondrites are distinct other carbonaceous chondrites, which has led to the suggestion that Ryugu/CI formed in a different region accretion disk, possibly around orbits Uranus Neptune. We show that, like for Fe, CI also have indistinguishable Ni isotope anomalies, differ those chondrites. propose this unique Fe composition reflects efficiencies small FeNi metal grains among chondrite parent bodies....
Secondary ion mass spectrometry (SIMS) is a powerful technique for in situ triple oxygen isotope measurements that has been used more than 30 years. Since pioneering works performed on small-radius microprobes the mid-80s, tremendous progress made terms of analytical precision, spatial resolution and analysis duration. In this respect, emergence mid-90s large-radius microprobe equipped with multi-collector system (MC-SIMS) was game changer. Further developments achieved CAMECA MC-SIMS since...
Ryugu C A CI CM CV CO 44/40 Ca SRM915a (age corrected)The Hayabusa2 spacecraft has returned samples from the Cb-type asteroid (162173) to Earth.Previous petrological and chemical analyses support a close link between chondrites that are presumed be chemically most primitive meteorites with solar-like composition.However, highly enriched in compared typical chondrites.To identify cause of this discrepancy, here we report stable isotopic data (expressed as δ ) for collected two sites.We found...
Interstellar ice is believed to be a cradle of complex organic compounds, commonly found within icy comets and interstellar clouds, in association with ultraviolet (UV) irradiation subsequent warming. We that UV-irradiated amorphous ices composed H2O, CH3OH, NH3 pure H2O behave like liquids over the temperature ranges 65 150 kelvin 50 140 kelvin, respectively. This low-viscosity liquid-like may enhance formation compounds including prebiotic molecules accretion dust form planetesimals under...