A5059784242- Astro and Planetary Science
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- High-pressure geophysics and materials
- Nuclear Physics and Applications
- Stellar, planetary, and galactic studies
- Geological and Geochemical Analysis
- Spacecraft and Cryogenic Technologies
- Astrophysics and Star Formation Studies
- Space Exploration and Technology
- Mass Spectrometry Techniques and Applications
- Atmospheric Ozone and Climate
- Spectroscopy and Chemometric Analyses
- Geology and Paleoclimatology Research
- Geomagnetism and Paleomagnetism Studies
- Spectroscopy and Laser Applications
- Chemical Thermodynamics and Molecular Structure
- Laser-induced spectroscopy and plasma
- Marine and environmental studies
- Energetic Materials and Combustion
- Water Quality Monitoring and Analysis
- Astronomical and nuclear sciences
- Geochemistry and Geologic Mapping
- Space Science and Extraterrestrial Life
- Archaeology and Historical Studies
Institut de Planétologie et d'Astrophysique de Grenoble
2016-2025
Université Grenoble Alpes
2016-2025
Centre National de la Recherche Scientifique
2015-2024
Université Joseph Fourier
2003-2015
University of Hawaiʻi at Mānoa
2009-2012
Carnegie Institution for Science
2012
Carnegie Observatories
2012
University of Hawaii System
2011
Observatoire des Sciences de l'Univers de Grenoble
2006
The VIRTIS (Visible, Infrared and Thermal Imaging Spectrometer) instrument on board the Rosetta spacecraft has provided evidence of carbon-bearing compounds nucleus comet 67P/Churyumov-Gerasimenko. very low reflectance (normal albedo 0.060 ± 0.003 at 0.55 micrometers), spectral slopes in visible infrared ranges (5 to 25 1.5 5% kÅ(-1)), broad absorption feature 2.9-to-3.6-micrometer range present across entire illuminated surface are compatible with opaque minerals associated nonvolatile...
Age dating of meteorite inclusions suggests rapid formation the building blocks terrestrial planets within 1 My Sun.
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...
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 present a database of magnetic susceptibility measurements on 971 ordinary chondrites. It demonstrates that this parameter can be successfully used to characterize and classify chondrite meteorites. In chondrites, rapid non‐destructive measurement essentially determines the amount metal in sample, which occurs very narrow range for each class (though terrestrial weathering result variable decrease susceptibility, especially finds). This technique is particularly useful not only...
Rosetta observes sublimating surface ices Comets are “dirty snowballs” made of ice and dust, but they dark because the sublimates away, leaving some dust behind on surface. The spacecraft has provided a close-up view comet 67P/Churyumov-Gerasimenko as it passes through its closest point to Sun (see Perspective by Dello Russo). Filacchione et al. detected spectral signature solid CO 2 (dry ice) in small patches nucleus emerged from local winter. By modeling how sublimates, constrain...
Analysis of the propagation Comet Nucleus Sounding Experiment by Radiowave Transmission (CONSERT) signal throughout small lobe 67P/CG nucleus has permitted us to deduce real part permittivity, at a value 1.27 ± 0.05. The first interpretation this value, using dielectric properties mixtures ices (H2O, CO2), refractories (i.e. dust) and porosity, led conclusion that comet porosity lies in range 75–85 per cent. In addition, dust-to-ice ratio was found between 0.4 2.6 permittivity dust...
Ammonium salts on comet 67P The distribution of carbon and nitrogen in the Solar System is thought to reflect stability carbon- nitrogen-bearing molecules when exposed heat forming Sun. Comets have a low nitrogen-to-carbon ratio, which contrary expectations because they originate outer where species should be common. Poch et al. used laboratory experiments simulate cometary surfaces compared resulting spectra with 67P/Churyumov-Gerasimenko. They assigned previously unidentified infrared...
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— A database of magnetic susceptibility (χ) measurements on different non‐ordinary chondrites (C, E, R, and ungrouped) populations is presented compared to our previous similar work ordinary chondrites. It provides an exhaustive study the amount iron‐nickel phases (essentially metal magnetite) in these meteorites. In contrast with all other classes, CM CV show a wide range mineral content, two orders magnitude variation χ. Whether this due primary parent body differences,...