Cédric Wolters
A5089915553- Astro and Planetary Science
- Isotope Analysis in Ecology
- Atmospheric Ozone and Climate
- Mass Spectrometry Techniques and Applications
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Analytical Chemistry and Chromatography
- Metabolomics and Mass Spectrometry Studies
- Space Exploration and Technology
- Molecular Spectroscopy and Structure
- Nuclear Physics and Applications
- Atmospheric chemistry and aerosols
- Spacecraft and Cryogenic Technologies
- Radiation Effects and Dosimetry
- Graphite, nuclear technology, radiation studies
- Fluoride Effects and Removal
- Radiation Detection and Scintillator Technologies
- Atmospheric and Environmental Gas Dynamics
- Radioactive element chemistry and processing
- Hemoglobin structure and function
- Marine and environmental studies
- History and advancements in chemistry
- Radioactive contamination and transfer
- Geology and Paleoclimatology Research
Institut de Planétologie et d'Astrophysique de Grenoble
2019-2024
Université Grenoble Alpes
2020-2024
Centre National d'Études Spatiales
2023-2024
Centre National de la Recherche Scientifique
2020-2024
Centre de Gestion Scientifique
2024
Observatoire des sciences de l'Univers Paris-Saclay
2022
Observatoire des Sciences de l'Univers de Grenoble
2022
The Hayabusa2 spacecraft collected samples from the surface of carbonaceous near-Earth asteroid (162173) Ryugu and brought them to Earth. were expected contain organic molecules, which record processes that occurred in early Solar System. We analyzed molecules extracted samples. identified a variety containing atoms CHNOS, formed by methylation, hydration, hydroxylation, sulfurization reactions. Amino acids, aliphatic amines, carboxylic polycyclic aromatic hydrocarbons, nitrogen-heterocyclic...
Samples from the carbonaceous asteroid (162173) Ryugu provide information on chemical evolution of organic molecules in early solar system. Here we show element partitioning major component ions by sequential extractions salts, carbonates, and phyllosilicate-bearing fractions to reveal primordial brine composition primitive asteroid. Sodium is dominant electrolyte salt fraction extract. Anions NH4+ are more abundant than carbonate phyllosilicate fractions, with molar concentrations order...
Polycyclic aromatic hydrocarbons (PAHs) contain ≲20% of the carbon in interstellar medium. They are potentially produced circumstellar environments (at temperatures ≳1000 kelvin), by reactions within cold (~10 kelvin) clouds, or processing carbon-rich dust grains. We report isotopic properties PAHs extracted from samples asteroid Ryugu and meteorite Murchison. The doubly-13C substituted compositions (Δ2×13C values) naphthalene, fluoranthene, pyrene 9 to 51‰ higher than values expected for a...
Abstract We report primordial aqueous alteration signatures in water-soluble organic molecules from the carbonaceous asteroid (162173) Ryugu by Hayabusa2 spacecraft of JAXA. Newly identified low-molecular-weight hydroxy acids (HO-R-COOH) and dicarboxylic (HOOC-R-COOH), such as glycolic acid, lactic glyceric oxalic succinic are predominant samples two touchdown locations at Ryugu. The quantitative qualitative profiles for hydrophilic between sampling shows similar trends within order ppb...
Abstract We performed in-situ analysis on a ~ 1 mm-sized grain A0080 returned by the Hayabusa2 spacecraft from near-Earth asteroid (162173) Ryugu to investigate relationship of soluble organic matter (SOM) minerals. Desorption electrospray ionization-high resolution mass spectrometry (DESI-HRMS) imaging mapped more than 200 CHN, CHO, CHO–Na (sodium adducted), and CHNO compounds. A heterogeneous spatial distribution was observed for different compound classes SOM as well among alkylated...
The organic matter in carbonaceous chondrites is of two kinds: one called Insoluble Organic Matter, made extremely large molecules that cannot be named with the usual nomenclature; can extracted by laboratory solvents and analyzed as a molecular mixture. Both are debated origin. Retracing their natural histories requires putting strong constraints on possible place birth life time space environments. It excluded they were formed an interstellar medium before accretion chondritic parent...
Abstract Recent transit spectra suggest organic aerosol formation in the atmosphere of sub-Neptunes. Sulfur gases are expected to be present warm exoplanet atmospheres with high metallicity. Many aspects sulfur fixation process by photochemistry planetary not fully understood. In this work, tholins produced a CO 2 -rich simulation experiment H S were analyzed very high-resolution mass spectrometry (HRMS) that allows for searching specific molecules addition providing some insight on mixture...
Abstract Very little experimental work has been done to explore the properties of photochemical hazes formed in atmospheres with very different compositions or temperatures than those outer solar system early Earth. With extrasolar planet discoveries now numbering thousands, this untapped phase space merits exploration. This study presents measured chemical haze particles produced laboratory analogs exoplanet atmospheres. We used high-resolution mass spectrometry measure components solid...
Context. Near- and mid-infrared observations have revealed the presence of organic refractory materials in solar system, cometary nuclei on surface centaurs, Kuiper-belt trans-neptunian objects. In these astrophysical environments, can be formed because interaction frozen volatile compounds with cosmic rays, stellar/solar particles, favoured by thermal processing. The analysis laboratory analogues such gives information their properties, complementary to observations. Aims. We present new...
Triton is the largest moon of Neptune system and possesses a thin nitrogen atmosphere with trace amounts carbon monoxide methane, making it similar composition to that dwarf planet Pluto. Like Pluto Saturn's Titan, has haze layer thought be composed organics formed through photochemistry. Here, we perform atmospheric chamber experiments 0.5% 0.2% methane in molecular at 90 K 1 mbar generate analogues. We then characterize physical chemical properties these particles. measure their production...
The chirality of amino acids in extraterrestrial materials may provide an insight into the origin essential l-enantiopure terrestrial biosphere. In 2020, Hayabusa2 mission succeeded bringing back surface from C-type asteroid (162173) Ryugu to Earth. Amino were one targeted organic molecules be studied samples. To analyze various structural isomers acids, which expected present, limited amount returned samples, development a highly-sensitive and selective analytical method was necessary....
Rationale Acquisition quality in analytical science is key to obtaining optimal data from a sample. In very high‐resolution mass spectrometry, driven by the optimization of multiple parameters, including use scans and micro‐scans (or transients) for performing Fourier transformation. Methods Thirty‐nine spectra single synthesized complex sample were acquired using various numbers determined through simple experimental design. An electrospray ionization source coupled with an LTQ Orbitrap XL™...
Transmission spectra have suggested that condensate clouds and/ or photochemical haze are present in the atmospheres of many temperate to warm exoplanets [1]. Aerosols can affect atmospheric composition directly through condensation and heterogeneous reactions, indirectly by impacting depth penetration photolyzing radiation, as well thermal structure dynamics [2]. However, haziness may not be simply controlled a single simple combination planetary/stellar parameters [3,4]. We still need more...
Liquid and gas chromatography have been extensively applied to the analysis of extraterrestrial materials their analogues. Methods are often highly specific, obtain largest possible description a given sample, it must be analyzed over dozens analytical methods instruments, requiring some heavy sample preparation. However, because meteorites analogue samples usually available in relatively small quantities, characterization requires an method that can reveal complex organic content, being...