Search Publications
The light-toned stratified sedimentary rock exposures in western Juventae Chasma, Mars, in context
Sarkar, Ranjan; Edgett, Kenneth S.; Singh, Pragya +1 more
Juventae Chasma, an isolated depression northeast of the Valles Marineris trough system, hosts four mounds of light-toned, layered materials. These are erosional remnants interpreted to consist of sedimentary rocks. The geological setting of Juventae Chasma is a complex amalgamation of terrains and surfaces of different morphologies, ages, and str…
Determination of the coma dust back-scattering of 67P for phase angles from 1.2° to 75°
Fink, Uwe; Doose, Lyn
A phase curve is derived for the dust coma of comet 67P/Churyumov-Gerasimenko (67P) from 1.2° to 74° using images from the OSIRIS camera system on board the Rosetta mission during the period 2014 July 25 to 2015 February 23 as the spacecraft approached the comet. We analyzed 123 images of the continuum filter at 612.6 nm and 60 images of the 375 n…
Volcanic flows versus water- and ice-related outburst deposits in eastern Hellas: A comparison
Jaumann, R.; Stephan, K.; Hauber, E. +1 more
Hellas Planitia is one of the major topographic sinks on Mars for the deposition of any kind of sediments. We report on our observations of sheet deposits in the eastern part of the basin that are apparently related to the Dao Vallis outflow channel. The deposits have lobate flow fronts and a thickness of a few decameters. Despite their generally …
Dust Impact Monitor (SESAME-DIM) on-board Rosetta/Philae: Aerogel as comet analog material
Flandes, Alberto; Krüger, Harald; Loose, Alexander +8 more
On 12 November 2014, during the descent of the Rosetta lander Philae to the surface of comet 67P/Churyumov-Gerasimenko the Dust Impact Monitor (DIM) on board Philae recorded an impact of a cometary dust impact of a cometary dust particle at 2.4 km from the comet surface (5 km from the nucleus' barycentre). In this work, we report further experimen…
PFS/MEX limb observations of 4.3-µm CO2 non-LTE emission in the atmosphere of Mars
Sindoni, G.; Formisano, V.; Longobardo, A. +3 more
We present PFS-MEX limb observations of the CO2 non-local thermodynamic equilibrium (non-LTE) emission at 4.3 µm in the atmosphere of Mars collected in more than six Martian years. With unprecedented spatial and temporal coverage, and relatively high spectral resolution, this unique dataset promises to improve our understanding of…
Reply to comment "On the hydrogen escape: Comment to variability of the hydrogen in the Martian upper atmosphere as simulated by a 3D atmosphere-exosphere coupling by J.-Y. Chaufray et al." by V. Krasnopolsky, Icarus, 281, 262
Forget, F.; Chaufray, J. -Y.; Leblanc, F. +4 more
Krasnopolsky (2017) makes a careful review of our recent results about the Martian hydrogen content of the Martian upper atmosphere (Chaufray et al., 2015). We comment here on his two major points. First, he suggests that the non-thermal escape of H2, and particularly collisions with hot oxygen, not taken into account in our general cir…
The distribution of putative periglacial landforms on the martian northern plains
Balme, Matthew R.; Patel, Manish R.; Hagermann, Axel +1 more
In this investigation, HiRISE images were surveyed across three regions of the Northern Plains of Mars; Acidalia, Arcadia and Utopia Planitiae. A sample of HiRISE images within each of these areas was examined. The aim of the investigation was to determine the distribution of three varieties of landform; clastic patterned ground, lobate hill-slope…
Long term evolution of temperature in the venus upper atmosphere at the evening and morning terminators
Pätzold, M.; Vandaele, A. C.; Montmessin, F. +11 more
This paper contains a comprehensive dataset of long-term observations between 2009 and 2015 at the upper mesosphere/lower thermosphere providing temperature values at different locations of the morning and evening side of the terminator of Venus. Temperature information is obtained by line-resolved spectroscopy of Doppler broadened CO2 …
Evidence for impact melt sheets in lunar highland smooth plains and implications for polar landing sites
Weitz, Catherine M.; Whitten, Jennifer L.; Campbell, Bruce A. +1 more
Smooth plains units attributed to fluidized basin ejecta occur over much of the lunar highlands. We examined 4-20 km diameter Imbrian- and Eratosthenian-period craters in the southern highlands that have high 12.6-cm wavelength radar backscatter and circular polarization ratios associated with their interior walls but not with their proximal eject…
The opposition effect in Saturn's main rings as seen by Cassini ISS: 4. Correlations of the surge morphology with surface albedos and VIMS spectral properties
Déau, Estelle; Dones, Luke; West, Robert A. +4 more
In this paper, we continue our analysis of the saturnian ring opposition effect seen by Cassini ISS. The ring opposition effect is a peak in the rings' reflectivity caused as the directions from a spot on the rings to the observer and to the light source, respectively, converge toward zero degrees. So far, the exact origin of the ring's opposition…