Jean‐Philippe Combe
A5013703967- Astro and Planetary Science
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Space Exploration and Technology
- Stellar, planetary, and galactic studies
- Geology and Paleoclimatology Research
- Spacecraft and Cryogenic Technologies
- Geomagnetism and Paleomagnetism Studies
- Astronomy and Astrophysical Research
- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- Marine and environmental studies
- Methane Hydrates and Related Phenomena
- Space Science and Extraterrestrial Life
- Solar and Space Plasma Dynamics
- Astrophysics and Star Formation Studies
- Scientific Research and Discoveries
- Advanced Numerical Methods in Computational Mathematics
- High-pressure geophysics and materials
- Atmospheric Ozone and Climate
- Geophysics and Gravity Measurements
- Geological Formations and Processes Exploration
- Water Quality Monitoring and Analysis
- Maritime and Coastal Archaeology
- Gamma-ray bursts and supernovae
Planetary Science Institute
2016-2024
Bear Fight Institute
2012-2021
National Institute for Astrophysics
2016
University of California, Los Angeles
2016
Institute for Space Astrophysics and Planetology
2016
Laboratoire de Planétologie et Géosciences
2006-2011
Space Science Institute
2006-2008
Nantes Université
2002-2007
Centre National de la Recherche Scientifique
1999-2007
Sorbonne Université
1999-2003
The search for water on the surface of anhydrous Moon had remained an unfulfilled quest 40 years. However, Mineralogy Mapper (M3) Chandrayaan-1 has recently detected absorption features near 2.8 to 3.0 micrometers Moon. For silicate bodies, such are typically attributed hydroxyl- and/or water-bearing materials. On Moon, feature is seen as a widely distributed that appears strongest at cooler high latitudes and several fresh feldspathic craters. general lack correlation this in sunlit M3 data...
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...
[1] The NASA Discovery Moon Mineralogy Mapper imaging spectrometer was selected to pursue a wide range of science objectives requiring measurement composition at fine spatial scales over the full lunar surface. To these objectives, broad spectral with high uniformity and signal-to-noise ratio capable measuring compositionally diagnostic absorption features from variety known possible materials required. For this purpose designed developed that measures 430 3000 nm 10 sampling through 24...
On 6 March 2015, Dawn arrived at Ceres to find a dark, desiccated surface punctuated by small, bright areas. Parts of Ceres’ are heavily cratered, but the largest expected craters absent. appears gravitationally relaxed only longest wavelengths, implying mechanically strong lithosphere with weaker deep interior. dry exterior displays hydroxylated silicates, including ammoniated clays endogenous origin. The possibility abundant volatiles depth is supported geomorphologic features such as flat...
INTRODUCTION The surface of the dwarf planet Ceres is known to host phyllosilicate minerals, but their distribution and origin have not previously been determined. Phyllosilicates are hydrated silicates, presence on intriguing given that structure evolves through an aqueous alteration process. In addition, some phyllosilicates bear NH 4 , which places a constraint pH redox conditions during evolution Ceres. We studied across planet’s better understand evolutionary pathway RATIONALE Using...
[1] High-resolution compositional data from Moon Mineralogy Mapper (M3) for the Moscoviense region on lunar farside reveal three unusual, but distinctive, rock types along inner basin ring. These are designated "OOS" since they dominated by high concentrations of orthopyroxene, olivine, and Mg-rich spinel, respectively. The OOS occur as small areas, each a few kilometers in size, that widely separated within highly feldspathic setting rim. Although abundance plagioclase is not well...
[1] Analysis of two absorption features near 3 μm in the lunar reflectance spectrum, observed by orbiting M3 spectrometer and interpreted as being due to OH H2O, is presented, results are used discuss processes producing these molecules. This analysis focuses on dependence absorptions physical properties, including composition, illumination, latitude, temperature. Solar wind proton-induced hydroxylation proposed creation process, its products could be a source for other reported types...
Water plays a key role in the evolution of terrestrial planets, and notably occurrence Earth's oceans. However, mechanism by which water has been incorporated into these bodies—including Earth—is still extensively debated. Here we report detection widespread 2.8 μm OH absorption bands on surface asteroid Vesta VIR imaging spectrometer board Dawn. These observations are surprising as is fully differentiated with basaltic surface. The distributed across Vesta's shows areas enriched depleted...
Abstract The Dawn spacecraft mission has provided extensive new and detailed data on Vesta that confirm strengthen the Vesta–howardite–eucrite–diogenite ( HED ) meteorite link concept is differentiated, as derived from earlier telescopic observations. Here, we present results by newly calibrated spectra of Vesta. comparison between imaging spectrometer— VIR —and different class meteorites shows average spectrum resembles howardite spectra. Nevertheless, at high spatial resolution reveal...
We examined the lunar swirls using data from Moon Mineralogy Mapper (M 3 ). The improved spectral and spatial resolution of M over previous imaging facilitates distinction subtle differences, provides new information about nature these enigmatic features. characterized features swirls, interswirl regions (dark lanes), surrounding terrain for each three focus regions: Reiner Gamma, Gerasimovich, Mare Ingenii. used Principle Component Analysis to identify spectrally distinct surfaces at...
Abstract We present global lithological maps of the Vestan surface based on Dawn mission's Visible InfraRed (VIR) Spectrometer acquisitions with a spatial sampling 200 m. The confirm results obtained data set acquired by VIR 700 m, that reflectance spectra Vesta's are dominated pyroxene absorptions can be interpreted within context distribution howardites, eucrites, and diogenites (HEDs). also partially agree ground Hubble Space Telescope observations: they background being an assemblage...
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...
Aram Chaos is a crater 280 km in diameter centered at 2.5°N, 338.5°E. It filled by chaotic terrains overlain dome‐shaped, layered 900 m thick formation displaying spectral signatures of ferric oxides on Thermal Emission Spectrometer (TES) and Observatoire pour la Mineralogie, L'Eau, les Glaces et L'Activite (OMEGA) medium spatial resolution data. We describe detail the mineralogical composition, structure, morphology this fill using high‐resolution data (OMEGA, Mars Orbiter Laser Altimeter,...
[1] The Moon Mineralogy Mapper (M3) provided the first global hyperspectral data of lunar surface in 85 bands from 460 to 2980 nm. Clementine mission multispectral maps 11 spectral across ultraviolet-visible (UV-VIS) and near-infrared (NIR). In an effort understand how M3 improves our ability analyze interpret data, we compare spectra with those Clementine's UV-VIS NIR cameras. NIR. We have found that reflectance values are lower all wavelengths compared albedos both show be redder, is, a...
Abstract The Dawn mission was designed to test our hypothesis about the origin and evolution of early solar system by visiting largest differentiated basaltic asteroid, 4 Vesta, believed be a survivor from earliest times rocky body formation. Observations orbit show that Vesta is parent Howardite, Eucrite, Diogenite meteorites. has an iron core eucritic–diogenitic crust. Its surface characterized abundant impact craters but with no evident volcanic features. It two ancient basins in southern...
Abstract The first ever regional thermal properties map of Vesta has been derived from the temperatures retrieved by infrared data mission Dawn. low average value inertia, 30 ± 10 J m −2 s −0.5 K −1 , indicates a surface covered fine regolith. A range inertia values suggesting terrains with different physical determined. lower regions north equator suggests that they are an older, more processed surface. few specific areas have higher than values, indicative compact material. highest...
Local detection of increasing amount water ice on Ceres’ surface indicates an active body and a possible seasonal cycle.