A5075962762- Astro and Planetary Science
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Geological and Geochemical Analysis
- Laser-induced spectroscopy and plasma
- Stellar, planetary, and galactic studies
- Nuclear Physics and Applications
- Geochemistry and Geologic Mapping
- Space Exploration and Technology
- High-pressure geophysics and materials
- Methane Hydrates and Related Phenomena
- Astrophysics and Star Formation Studies
- Geomagnetism and Paleomagnetism Studies
- Space Science and Extraterrestrial Life
- Geology and Paleoclimatology Research
- Astronomical Observations and Instrumentation
- Geophysics and Gravity Measurements
- Spectroscopy and Chemometric Analyses
- Hydrocarbon exploration and reservoir analysis
- Gamma-ray bursts and supernovae
- Seismic Imaging and Inversion Techniques
- Spacecraft and Cryogenic Technologies
- Drilling and Well Engineering
- Astronomy and Astrophysical Research
- Remote Sensing and Land Use
Institut d'Astrophysique Spatiale
2018-2024
Université Paris-Saclay
2018-2024
Centre National de la Recherche Scientifique
2014-2024
Université Paris-Sud
2018-2021
Laboratoire d’études spatiales et d’instrumentation en astrophysique
2013-2019
Observatoire de Paris
2013-2019
Janssen (France)
2016-2019
University of Oxford
2018
Massachusetts Institute of Technology
2017-2018
Délégation Paris 7
2013-2018
Abstract During its approach to asteroid (101955) Bennu, NASA’s Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) spacecraft surveyed Bennu’s immediate environment, photometric properties, rotation state. Discovery of a dusty natural satellite, or unexpected characteristics would have had consequences for the mission’s safety observation strategy. Here we show that observations during this period were highly sensitive satellites (sub-meter...
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.
Context. Asteroid (101955) Bennu is the target of NASA’s Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) mission. The spacecraft’s instruments have characterized at global local scales to select a sampling site provide context for sample that will be returned Earth. These observations include thermal infrared spectral characterization by OSIRIS-REx Thermal Emission Spectrometer (OTES). Aims. To understand degree compositional particle...
This paper summarizes the evidence for optical effects of space weathering, as well properties surface that control changes, on asteroid (101955) Bennu. First, we set stage by briefly reviewing what was known about weathering low-albedo materials from telescopic surveys, laboratory simulations, and sample return analysis. We then look at nature Bennu recent spacecraft imaging spectroscopy observations, including visible to near-infrared thermal infrared wavelengths, followed other...
Context. Space weathering changes asteroid surfaces. We know from observations of the Moon and high-albedo asteroids that interplanetary surface processes can alter spectral properties silicates. The next step is to extend study primitive asteroids. This work supports OSIRIS-REx mission by providing predictions for what space effects we expect find on target: (101955) 1999 RQ36.
Context. Space weathering (SW) is crucial to improve the understanding of evolution optical characteristics on airless bodies. The classical view based research Moon suggests that SW decreases albedo (darkening) and steepens spectral slope (reddening) in visible near-infrared (VIS-NIR) wavelengths, producing nanophase iron (npFe 0 ). However, this conclusion not perfectly applicable asteroids. Aims. In study, we focus investigating space alteration effects (SWSAE) causes various types...
Abstract Returned samples from Cb-type asteroid (162173) Ryugu exhibit very dark spectra in visible and near-infrared ranges, generally consistent with the Hayabusa2 observations. A critical difference is that a structural water absorption of hydrous silicates around twice as deep returned compared those Ryugu’s surface, suggesting surface more dehydrated. Here we use laboratory experiments data to indicate spectral differences between are best explained if has (1) higher porosity, (2)...
In this study we compare the infrared and Raman micro-spectroscopy signatures of Asuka 12236 Paris meteorite, both considered among most primitive in carbonaceous chondrites collection.The obtained average spectrum from mid to far reveals presence anhydrous minerals as well a possible contribution amorphous silicates. Aromatic primary amines imines heterogeneously distributed within are also reported. These components not found Paris.The richness nitrogen bearing components, could give clues...
NH-rich compounds have been detected on Ceres (Sanctis et al., 2015), comet 67P (Poch 2020) and possibly other asteroids (Rivikin 2022), based the 3.1 µm absorption in their infrared reflectance spectrum. This feature has never found among meteorite collections but recently reported returned Ryugu sample (Pilorget 2022). Studying these can help us understand parent bodies evolution volatiles delivery within Solar System. In 2023, NASA’s OSIRIS-REx mission ~120 g from...
Context. The NASA Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) mission has obtained thousands of spectra asteroid (101955) Bennu with the OSIRIS-REx Visible InfraRed Spectrometer. Aims. We present a spectral search for minor absorption bands determine compositional variations on surface Bennu. Methods. Reflectance low high spatial resolutions were analyzed evidence weak bands. Spectra also divided by global average spectrum to isolate...
Space weathering is a process that changes the surface of airless planetary bodies. Prime space agents are solar wind irradiation and micrometeoroid bombardment. These processes alter reflectance spectra often modify their compositional diagnostic features. In this work we focused on simulating comparing spectral caused by bombardment to gain better understanding these individual processes. We used olivine pyroxene pellets as proxies for materials. To simulate hydrogen, helium, argon ions...