S. Le Mouélic

S. Le Mouélic
CNRS - University of Nantes · Laboratoire de Planétologie et Géodynamique

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622
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Publications

Publications (622)
Preprint
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We examine the observed properties of the Nili Fossae olivine-clay-carbonate lithology from orbital data and in situ by the Mars 2020 rover at the S\'e\'itah unit in Jezero crater, including: 1) composition (Liu, 2022) 2) grain size (Tice, 2022) 3) inferred viscosity (calculated based on geochemistry collected by SuperCam (Wiens, 2022)). Based on t...
Article
Prior to the Perseverance rover landing, the acoustic environment of Mars was unknown. Models predicted that: (i) atmospheric turbulence changes at centimeter scales or smaller at the point where molecular viscosity converts kinetic energy into heat1, (ii) the speed of sound varies at the surface with frequency2,3, and (iii) high frequency waves ar...
Conference Paper
Full-text available
The Perseverance rover landed on the floor of Jezero crater on 18 February 2021. The landing site, named “Octavia E. Butler” is located ~2.2 km from the SE-facing erosional scarp of the western fan deposits, which are of strong interest for the mission [1-2]. Images obtained using the Mastcam-Z camera and the Remote Micro-Imager (RMI) of the SuperC...
Conference Paper
Full-text available
Orbital and rover observations of relict geomorphic features and stratigraphic architectures indicate Mars once had a warmer, wetter climate. Constraining the character, relative timing and persistence of ancient aqueous activity on Mars is possible through detailed interrogation of the stratal geometry of aqueously deposited sedimentary bodies. Su...
Conference Paper
Full-text available
Upon landing in February 2020, the rover Perseverance of the Mars2020 mission has been exploring Jezero crater on Mars, seeking traces of ancient life. This crater was notably first selected because of the presence of a well-developed fan-shaped sedimentary body in its western part, at the mouth of Neretva Vallis (Fig. 1, e.g., [1]). At the time of...
Conference Paper
Full-text available
Sulfate salts deposited in sedimentary basins are major geochemical markers of paleoclimate, source rocks, and dissolved gases and ions [1]. On Mars, prominent thick-layered sulfate-bearing deposits are observed at a number of late Noachian to late Hesperian locations (~3.5 Ga) [2]. Their apparent absence in older strata has led to the hypothesis t...
Conference Paper
Full-text available
Since its landing in 2012, the Curiosity rover has been exploring geological records of a paleolacustrine environment in Gale crater. It started with the fluvio-deltaic and lacustrine deposits in the lowermost Bradbury Group, followed by 300 m of stratigraphy through the Murray formation (from the Pahrump Hills to the Jura member) dominated by mud...
Conference Paper
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During their third Extra-Vehicular Activity, Apollo 17 astronauts had the opportunity to photo-document with their Hasselblad cameras a col-lection of five large boulder fragments and regolith, lying at the base of a long trail descending from the North Massif [1] (Fig. 1). We recombined these origi-nal photographs using photogrammetry techniques t...
Article
Full-text available
In response to ESA’s “Voyage 2050” announcement of opportunity, we propose an ambitious L-class mission to explore one of the most exciting bodies in the Solar System, Saturn’s largest moon Titan. Titan, a “world with two oceans”, is an organic-rich body with interior-surface-atmosphere interactions that are comparable in complexity to the Earth. T...
Preprint
Full-text available
Perseverance’s microphones provide the first characterization of Mars’ acoustic environment and pressure fluctuations in the audible range and beyond, from 20 Hz to 50 kHz. Prior to this mission, modeling predicted that: (i) atmospheric turbulence must change at centimeter scales or smaller at the point where molecular viscosity converts kinetic en...
Article
We present the Infrared spectrometer of SuperCam Instrument Suite that enables the Mars 2020 Perseverance Rover to study remotely the Martian mineralogy within the Jezero crater. The SuperCam IR spectrometer is designed to acquire spectra in the 1.3–2.6μm domain at a spectral resolution ranging from 5 to 20 nm. The field-of-view of 1.15 mrad, is co...
Preprint
Full-text available
We present the Infrared spectrometer of SuperCam Instrument Suite that enables the Mars 2020 Perseverance Rover to study remotely the Martian mineralogy within the Jezero crater. The SuperCam IR spectrometer is designed to acquire spectra in the 1.3-2.6 $\mu$m domain at a spectral resolution ranging from 5 to 20~nm. The field-of-view of 1.15 mrad,...
Preprint
Full-text available
In response to ESA Voyage 2050 announcement of opportunity, we propose an ambitious L-class mission to explore one of the most exciting bodies in the Solar System, Saturn largest moon Titan. Titan, a "world with two oceans", is an organic-rich body with interior-surface-atmosphere interactions that are comparable in complexity to the Earth. Titan i...
Article
Full-text available
The Mars Science Laboratory rover Curiosity landed in Gale crater (Mars) in August 2012. It has since been studying the lower part of the 5 km-high sedimentary pile that composes Gale’s central mound, Aeolis Mons. To assess the sedimentary record, the MSL team mainly uses a suite of imagers onboard the rover, providing various pixel sizes and field...
Article
Observations from orbital spacecraft have shown that Jezero crater, Mars, contains a prominent fan-shaped body of sedimentary rock deposited at its western margin. The Perseverance rover landed in Jezero crater in February 2021. We analyze images taken by the rover in the three months after landing. The fan has outcrop faces that were invisible fro...
Article
We mapped in detail Titan's South Belet region which spans from longitude 60°E to 120°E and from latitude 60°S to 0°, encompassing both equatorial and southern mid-latitude regions. We used Cassini RADAR in its Synthetic Aperture Radar (SAR) mode data as our basemap, which covers 31.8% of the region, supplemented with data from the RADAR's radiomet...
Article
Full-text available
The Curiosity rover is exploring Hesperian-aged stratigraphy in Gale crater, Mars, where a transition from clay-bearing units to a layered sulfate-bearing unit has been interpreted to represent a major environmental transition of unknown character. We present the first description of key facies in the sulfate-bearing unit, recently observed in the...
Conference Paper
Full-text available
The spectral analysis of a planetary surface is fundamental for a deeper understanding of the mineralogy and composition. In particular, the determination of spectral units is a reliable method to infer the physical and compositional properties of a surface by processing several spectral parameters simultaneously, instead of the more traditional ap...
Article
Full-text available
On the NASA 2020 rover mission to Jezero crater, the remote determination of the texture, mineralogy and chemistry of rocks is essential to quickly and thoroughly characterize an area and to optimize the selection of samples for return to Earth. As part of the Perseverance payload, SuperCam is a suite of five techniques that provide critical and co...
Article
Full-text available
The Science Case for a Titan Flagship-class Orbiter with Probes White paper #325 submitted to the Planetary Science and Astrobiology Decadal Survey 2023-2032. Topics: giant planets systems; ocean worlds; other: Mission Studies by Conor Nixon, James Abshire, Andrew Ashton, Jason W. Barnes, Nathalie Carrasco, Mathieu Choukroun, Athena Coustenis, Lo...
Article
Full-text available
As one of two planetary objects (other than Earth) that have solid surfaces, thick atmospheres, and astrobiological significance, Titan, like Mars, merits ongoing study with multiple spacecraft. We propose that a Titan orbiter dedicated to geophysics, geology, and atmospheric science be added to the New Frontiers menu for the coming decade.
Conference Paper
Full-text available
The ChemCam Remote Micro-Imager (RMI) onboard Curiosity was originally designed to document the tiny areas analyzed by the instrument’s laser-induced breakdown spectroscopy (LIBS) tech-nique on rocks within a few meters around the rover [1, 2]. The RMI produces 1024x1024 pixel black and white images directly from ChemCam’s telescope focal plane. Ea...
Conference Paper
Full-text available
Gale crater preserves a 5-km-thick sequence of stratified rocks, the lower-most section of which exhibits orbital spectra signatures of clay miner-als transitioning up to sulfates over several hundred me-ters of stratigraphy [1,2]. Understanding the reason for this wet-to-dry change recorded in the mineralogical signature is one of the primary obje...
Conference Paper
Full-text available
The application of Virtual Reality (VR) to research ends is a recent but growing practice among the community. This technique unlocks previ-ously underrated possibilities to study hardly accessible areas, which is particularly suited for planetary bodies [e.g. 1, 2]. Indeed, a wealth of data (imagery, elevations, mineralogy, etc.) gathered by orbit...
Conference Paper
Full-text available
Since Jan. 2019 (~sol 2300), the Mars Science Laboratory rover Curiosity has been ex-ploring the Glen Torridon (GT) region of Gale Crater, seeking to examine clay-bearing strata initially detected using orbiter data [1]. The presence of hydrated clay minerals has major implications for understanding the wet early Mars. The sedimentary record of the...
Article
Full-text available
The SuperCam instrument suite provides the Mars 2020 rover, Perseverance, with a number of versatile remote-sensing techniques that can be used at long distance as well as within the robotic-arm workspace. These include laser-induced breakdown spectroscopy (LIBS), remote time-resolved Raman and luminescence spectroscopies, and visible and infrared...
Article
Gale crater is a large impact crater with a ca 5 km thick sequence of stratified rocks in it, expressed today as a central eroded mound (i.e., Aeolis Mons informally named Mt. Sharp). A goal of the current Mars Science Laboratory mission in Gale crater is to investigate the processes that deposited, lithified, and eroded this fill. The Light-Toned...
Conference Paper
Full-text available
Virtual Reality (VR) and Augmented Reality (AR) coupled with 3D terrain reconstructions are increasingly used for science, education and out-reach applications. These techniques [1, 2] are becom-ing more widespread thanks to the release since 2016 of reliable, versatile and cost-effective hardware solutions accessible to the general public. In the...
Article
Full-text available
As one of two planetary objects (other than Earth) that have solid surfaces,thick atmospheres, and astrobiological significance, Titan, like Mars, merits ongoing studywith multiple spacecraft. We propose that a Titan orbiter dedicated to geophysics, geology,and atmospheric science be added to the New Frontiers menu for the coming decade.
Conference Paper
Full-text available
Curiosity’s southward traverse up the lower north slope of Mt. Sharp (in Gale crater, Mars) and across Glen Torridon has brought it in contact with the organics-bearing sediments of the Knockfarril Hill member, the light-toned, nodule-rich strata found at Western, Central, and Tower buttes, and to the abrupt truncation of these altered Murray sedim...
Conference Paper
Full-text available
The Glen Torridon (GT) region in Gale crater, has been explored using the Mars Science Laboratory rover, Curiosity, since January 2019 (~Sol 2300) to document clay-bearing rocks initially detected via orbiter data [1]. The rocks are part of the Murray formation, with lower GT consisting of the Jura member mudstones generally associated with a lacus...
Conference Paper
Full-text available
Virtual Reality (VR, with headsets) and Augmented Reality (AR, using a smartphone or tablet) coupled with 3D photogrammetric reconstructions are increasingly used for science, education and outreach applications. These techniques are not new [e. g. 1, 2], but they are becoming progressively more widespread thanks to the release in 2016 of technolog...
Conference Paper
Full-text available
South Polar Aitken (SPA) is the largest and deepest basin on the Moon [1, 2], and several regions within this widespread basin have been considered as possible landing sites for present and future missions. Some of these sites are also targets of the H2020 n° 776276- PLANMAP project [3]. In this work, we focus on specific areas within SPA, Apollo b...
Preprint
Full-text available
We outline a flagship-class mission concept focused on studying Titan as a global system, with particular emphasis on the polar regions. Investigating Titan from the unique standpoint of a polar orbit would enable comprehensive global maps to uncover the physics and chemistry of the atmosphere, and the topography and geophysical environment of the...
Article
Full-text available
We identify and document the instances of bright ephemeral features (BEF)—bright areas that appear, disappear, and shift from flyby to flyby on Titan’s north pole, using the Cassini Visual and Infrared Mapping Spectrometer data set, thereby developing a sense of their spatial distribution and temporal frequency. We find that BEFs have differing geo...
Article
Full-text available
The Taurus-Littrow valley on the Moon was the location of intensive geologic fieldwork during three days in December 1972. In situ activities at sampling stations were systematically documented by the astronauts using a series of overlapping images taken with their Hasselblad cameras. We investigated how this Apollo image archive can be used to per...
Preprint
Full-text available
Between 2004 and 2017, spectral observations have been gathered by the Visual and Infrared Mapping Spectrometer (VIMS) on-board Cassini (Brown et al., 2004) during 23 Enceladus close encounters, in addition to more distant surveys. The objective of the present study is to produce a global hyperspectral mosaic of the complete VIMS data set of Encela...
Data
The rover Perseverance of the Mars2020 mission will depart to Mars in July 2020 and land on Mars in February 2021. Its landing site, Jezero crater, has been selected due to the presence of two fan deltas, inlet and outlet valleys and a huge number of aqueous landforms (fluvial and lacustrine sediments). This morpho-stratigraphic map has been produc...
Presentation
Full-text available
Since 2012, the Mars Science Laboratory Curiosity rover has studied the sedimentary deposits within the Gale Crater, leading to the description of varying lacustrine to fluviatile and fluvio-deltaic environments. Here, we focus on the sedimentary record of the Kimberley outcrop traversed by Curiosity between sols 603 and 630. This section presents...
Article
The Curiosity rover's campaign in the Gale crater on Mars provides a large set of close-up images of sedimentary formations outcrops displaying a variety of diagenetic features such as light-toned veins, nodules and raised ridges. Through 2D and 3D analyses of Mastcam images we herein reconstruct the vein network of a sample area and estimated the...
Article
Between 2004 and 2017, spectral observations have been gathered by the Visual and Infrared Mapping Spectrometer (VIMS) on-board Cassini (Brown et al., 2004) during 23 Enceladus close encounters, in addition to more distant surveys. The objective of the present study is to produce a global hyperspectral mosaic of the complete VIMS data set of Encela...
Conference Paper
Full-text available
The Glen Torridon (GT) region in Gale crater, Mars, has been explored by the Mars Science Laboratory Curiosity rover since ~Sol 2300 (Feb. '19), seeking traces of the clay-bearing minerals initially detected from orbiter data [1]. The lowermost locations of the GT trough are dominated by the Jura member mudstones, and fine-grained sandstones of the...
Article
Structure-from-Motion photogrammetry has recently become a cheap and efficient method to reconstruct accurate and highly-resolved 3D Digital Outcrop Model (DOM) from a single set of images. This enables the 3D visualization of hardly accessible and/or remote geological scenes, which is of strong interest for planetary bodies. This paper focuses on...
Conference Paper
Full-text available
Virtual reality (VR) headsets are available to the general public since 2016. This new immersive technique potentially allows the users to explore 3D reconstructed planetary landscapes, as if they were physically present "on the field". We investigate how the in situ lunar imagery can be used to provide the user the possibility to explore in VR the...
Conference Paper
Full-text available
We investigate the performance of the recently released image processing software suite “Topaz Gigapixel” on martian images from the Mars Science Laboratory “Curiosity” rover. The objective is to evaluate the possibility to visually enhance the apparent resolution of acquired images, using cutting-edge image processing algorithms, in order to impro...
Poster
Full-text available
The Kimberley outcrop, traversed by Curiosity in 2014, shows a siliciclastic depositional record with an unexpectedly high potassic content. However, its intra- and inter-formational relations are still poorly constrained yet critical to understand the paleoenvironmental implication of this geochemical anomaly. To answer these questions, we use a h...
Conference Paper
Full-text available
The Kimberley outcrop, traversed by Curiosity in 2014, shows a siliciclastic depositional record with an unexpectedly high potassic content. However, its intra-and inter-formational relations are still poorly constrained yet critical to understand the paleoenvironmental implication of this geochemical anomaly. To answer these questions, we use a hi...
Conference Paper
Full-text available
We study the temporal and spatial evolution of rain-wetted surface on the north pole of Titan to aid our understanding of seasonality of the methane cycle and its evolution through time. These observations would also enable us to explore the reasons GCM(General Circulation Model) predictions of northern summers differ from the observed rainfall/sto...
Conference Paper
Full-text available
Since 2012, the Mars Science Laboratory rover Curiosity has studied the sedimentary record of the Gale Crater. This work focuses on the sedimentary record of the Kimberley outcrop, traversed by Curiosity between sols 603 and 630. This section presents siliciclastic rocks with an unusually high potassic content (Le Deit et al., JGR-Planets, 2016). H...
Poster
Full-text available
Since 2012, the Mars Science Laboratory rover Curiosity has studied the sedimentary record of the Gale Crater. This work focuses on the sedimentary record of the Kimberley outcrop, traversed by Curiosity between sols 603 and 630. This section presents siliciclastic rocks with an unusually high potassic content (Le Deit et al., JGR-Planets, 2016). H...