Search Publications
Martian paleolake outlet canyons - Evidence for controls on valley network formation
Sefton-Nash, Elliot; Miguel, Yamila; Diamant, Sharon J. M. +1 more
Martian valley networks (VNs) have been viewed as one of the most compelling pieces of evidence for ancient fluvial activity during the Late Noachian and Early Hesperian periods (3.7-3.5 Ga), likely as a result of precipitation (snowfall/rainfall). During this period, paleolakes also formed, predominantly due to water accumulation within impact cr…
Overview of a large observing campaign of Jupiter's aurora with the Hubble Space Telescope combined with Juno-UVS data
Bonfond, B.; Nichols, J. D.; Gérard, J. -C. +8 more
Between February and September 2019, Jupiter's ultraviolet aurorae were frequently observed during a large campaign of the Hubble Space Telescope (HST GO-15638). The campaign included approximately 10 visits around each of the perijoves of the Juno spacecraft orbits 18 to 22 around Jupiter. During this time, the solar activity was minimal, giving …
CO2 in the atmosphere of Mars depleted in 13C
Vandaele, Ann Carine; Aoki, Shohei; Liuzzi, Giuliano +14 more
We present here vertically resolved measurements of the carbon isotopic composition of CO2 in the Martian atmosphere between the surface and 50 km of altitude. The results are based on data taken by the ExoMars Trace Gas Orbiter with the NOMAD instrument and have been aggregated to derive an average vertical profile of 13C/
Crustal origin for olivine in the lunar Shioli crater ejecta boulders: Insights from the geological setting of Theophilus crater and Nectaris basin
Bhattacharya, Satadru; Pathak, Sumit; Kumar, P. Senthil +6 more
On the Moon, impact craters and basins expose a wide range of crustal and mantle rocks that provide excellent opportunity for sampling them, understanding their origins and reconstructing spatial and temporal evolution of lunar interior. The previous studies detected olivine-bearing mantle rocks in and around large impact craters and basins. The J…
Analysis of faults and pit chains in Noctis Labyrinthus: Implications for early extension and possible magmatic plumbing
Sefton-Nash, Elliot; De Marchi, Guido; D'Incecco, Piero +10 more
Noctis Labyrinthus has been a region of disputed origin due to its complexity and poor understanding of how various processes and mechanisms may have combined to form it. The surface is an integrated record of intensive tectonic activity expressed by a multiple extended sets of dip-slip faults oriented in different directions, and thought to have …
Water ice concentration and distribution in the Martian south polar layered deposits constrained by the lateral variations of their bulk density
Mitri, Giuseppe; Genova, Antonio; Sulcanese, Davide +4 more
Records of Mars' climate history have been preserved by the ice-rich south polar layered deposits. An accurate knowledge of their properties is key to understanding the evolution of Mars. The combination of geophysical measurements, including gravity, altimetry and radar sounding, enables constraints on the density and composition of the south pol…
Distribution of atmospheric aerosols during the 2007 Mars dust storm (MY 28): Solar infrared occultation observations by SPICAM
Montmessin, F.; Bertaux, J. -L.; Fedorova, A. A. +3 more
Solar occultation measurements by the SPICAM IR on Mars-Express have been used to study aerosol vertical distribution during the 2007 global dust storm (GDS) of Mars Year 28. Measurements in the near-IR spectral range from 1 to 1.7 µm provide information about aerosol optical properties, extinction coefficient, particle size and number densi…
Structural control on formation of polygonal rims of impact craters in Thaumasia Minor, Mars
Dasgupta, Dipayan; Kundu, Abhik; Dasgupta, Nilanjan +3 more
It has been known for almost a century that the surfaces of rocky planets contain polygonal-shaped, circular, or elliptical craters. Researchers have hypothesized that pre-existing structurally weak planes, such as faults or fractures, in the vicinity of the impact, are responsible for polygonal patterns of the crater rims. Thaumasia Minor, Mars, …
A global map of gullied hillslopes on Mars
Conway, S. J.; Noblet, A.; Osinski, G. R.
The distribution of gullies on Mars has been used to support different modes of formation involving CO2, H2O or entirely dry processes. We mapped the extent of gullied hillslope using a global mosaic of ConTeXt camera (CTX) at 6 m/pixel and High Resolution Imaging Science Experiment (HiRISE) browse products at ∼3 m/pixel. Our…
Seasonal low albedo streaks at the edge of the Martian south polar layered deposits
Lucchetti, Alice; Pajola, Maurizio; Cremonese, Gabriele +6 more
Low Albedo Streaks (LAS) are narrow dark streaks observed at the edges of the South Polar Layered Deposits (SPLD) on Mars. We investigate the seasonal morphology, surface topography of LAS-rich areas using monochrome and multiband images from both the High Resolution Imaging Science Experiment (HiRISE) and the Color and Stereo Surface Imaging Syst…