A5020873972- Planetary Science and Exploration
- Astro and Planetary Science
- Spacecraft and Cryogenic Technologies
- Isotope Analysis in Ecology
- Geology and Paleoclimatology Research
- Geophysical Methods and Applications
- Space Exploration and Technology
- Nuclear Physics and Applications
- Space Satellite Systems and Control
- Space Science and Extraterrestrial Life
- Scientific Research and Discoveries
- Spacecraft Design and Technology
- High-pressure geophysics and materials
- Stellar, planetary, and galactic studies
- Microwave Imaging and Scattering Analysis
- Geophysics and Gravity Measurements
- Ionosphere and magnetosphere dynamics
- Cryospheric studies and observations
- Atomic and Subatomic Physics Research
- Solar and Space Plasma Dynamics
- Radio Astronomy Observations and Technology
- Spacecraft Dynamics and Control
- Soil Moisture and Remote Sensing
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Geophysical and Geoelectrical Methods
Université Grenoble Alpes
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Institut de Planétologie et d'Astrophysique de Grenoble
2015-2024
National Council for Scientific Research
2018-2020
Université Joseph Fourier
2004-2015
Laboratoire Interdisciplinaire de Physique
2015
Laboratoire de Planétologie et Géosciences
2008
Sapienza University of Rome
2005
Jet Propulsion Laboratory
2005
Space (Italy)
2005
The martian subsurface has been probed to kilometer depths by the Mars Advanced Radar for Subsurface and Ionospheric Sounding instrument aboard Express orbiter. Signals penetrate polar layered deposits, probably imaging base of deposits. Data from northern lowlands Chryse Planitia have revealed a shallowly buried quasi-circular structure about 250 kilometers in diameter that is interpreted be an impact basin. In addition, planar reflector associated with basin may indicate presence low-loss...
The Philae lander, part of the Rosetta mission to investigate comet 67P/Churyumov-Gerasimenko, was delivered cometary surface in November 2014. Here we report precise circumstances multiple landings Philae, including bouncing trajectory and rebound parameters, based on engineering data conjunction with operational instrument data. These also provide information mechanical properties (strength layering) surface. first touchdown site, Agilkia, appears have a granular soft (with compressive...
The Philae lander provides a unique opportunity to investigate the internal structure of comet nucleus, providing information about its formation and evolution in early solar system. We present Comet Nucleus Sounding Experiment by Radiowave Transmission (CONSERT) measurements interior 67P/Churyumov-Gerasimenko. From propagation time form signals, upper part "head" 67P is fairly homogeneous on spatial scale tens meters. CONSERT also reduced size uncertainty Philae's final landing site down...
Abstract Hera is a planetary defense mission under development in the Space Safety and Security Program of European Agency for launch 2024 October. It will rendezvous late 2026 December with binary asteroid (65803) Didymos particular its moon, Dimorphos, which be impacted by NASA’s DART spacecraft on 2022 September 26 as first deflection test. The main goals are detailed characterization physical properties Dimorphos crater made mission, well measurement momentum transfer efficiency...
The polar layered deposits are the largest reservoir of water on surface Mars. physical properties ice and their spatial distribution largely unknown. 140,000 data points from sounding radar SHARAD Mars Reconnaissance Orbiter were analyzed over Gemina Lingula region, one‐fourth north area. Maps dielectric bulk drawn up. There is no basal melting signature. A drop constant in north‐west could be explained by an abrupt 250‐meter uplift base. studied region has average 3.10 ( σ = 0.12) a loss...
Abstract This chapter reviews the estimates of dust-to-gas and refractory-to-ice mass ratios derived from Rosetta measurements in lost materials nucleus 67P/Churyumov-Gerasimenko, respectively. First, by instruments are described, as well relevant characteristics 67P. The complex picture activity 67P, with its extreme North-South seasonal asymmetry, is presented. Individual then presented compared, showing wide ranges plausible values. ’s wealth information suggests that ratio made cometary...
The Martian ionosphere's local total electron content (TEC) and the neutral atmosphere scale height can be derived from radar echoes reflected surface of planet. We report global distribution TEC by analyzing more than 750,000 Mars Advanced Radar for Subsurface Ionospheric Sounding (MARSIS). This is first direct measurement ionosphere. technique used in this paper a novel “transmission‐mode” sounding ionosphere contrast to Active experiment (AIS) on MARSIS, which generally operates...
TandEM was proposed as an L-class (large) mission in response to ESA's Cosmic Vision 2015–2025 Call, and accepted for further studies, with the goal of exploring Titan Enceladus. The concept is perform situ investigations two worlds tied together by location properties, whose remarkable natures have been partly revealed ongoing Cassini–Huygens mission. These bodies still hold mysteries requiring a complete exploration using variety vehicles instruments. ambitious because its targets are most...
The search for evidence of past or present life on Mars is the principal objective 2020 ESA-Roscosmos ExoMars Rover mission. If such to be found anywhere, it will most likely in subsurface, where organic molecules are shielded from destructive effects ionizing radiation and atmospheric oxidants. For this reason, mission has been optimized investigate subsurface identify, understand, sample those locations conditions preservation found. Water Ice Subsurface Deposit Observation (WISDOM)...
We review the complex relationship between dust-to-gas mass ratio usually estimated in material lost by comets, and refractory-to-ice inside nucleus, which constrains origin of comets. Such a is dominated transfer from perihelion erosion to fallout over most nucleus surface. This makes up 10 times larger than material, because missing refractories were pristine before erosion. ratios available for comet nuclei visited space missions, Kuiper Belt Objects with well-defined bulk density,...
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...
We describe the radio science experiment proposed for Rosetta cometary mission. The consists in transmission of electromagnetic waves between landers and orbiter through comet to study its internal structure. In paper, model is presented used evaluate potentiality experiment. Various modellings wave propagation are discussed. Finally, a description instrument made.
A major finding in exploration of Mars is the indication that a large quantity water has been present on Mars. To discover distribution this water, Express spacecraft carrying spaceborne radar sounder, called Advance Radar for Subsurface and Ionospheric Sounding (MARSIS), order to map subsurface dielectric characteristics. The returned echoes from will contain both surface reflection components, but part signal we are interested reflected layers. retrieve these weak deep signal, processing...
Context. After the successful landing of Philae on nucleus 67P/Churyumov-Gerasimenko, Rosetta mission provided first opportunity performing measurements with CONSERT tomographic radar in November 2014. data were acquired during this science sequence. They unambiguously showed that propagation through smaller lobe was achieved.
Abstract NASA’s Double Asteroid Redirection Test (DART) is the first full-scale test of an asteroid deflection technology. Results from hypervelocity kinetic impact and Earth-based observations, coupled with LICIACube later Hera mission, will result in measurement momentum transfer efficiency accurate to ∼10% characterization Didymos binary system. But DART a single experiment; how could these results be used future planetary defense necessity involving different asteroid? We examine what...
Abstract The detection of anomalously strong relative basal reflectivity beneath the Martian South Polar Layered Deposits (SPLD) from Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) has led to hypotheses suggesting presence materials such as liquid water. Here, we propose a forward approach assess whether high signal could be produced by terrain currently exposed at surface without We convert existing MARSIS measurements into if it were overlaid an SPLD‐like ice deposit....