Publications
Filter Total Items: 336
Hydrocarbons on Saturn's satellites Iapetus and Phoebe Hydrocarbons on Saturn's satellites Iapetus and Phoebe
Material of low geometric albedo (pV ??? 0.1) is found on many objects in the outer Solar System, but its distribution in the saturnian satellite system is of special interest because of its juxtaposition with high-albedo ice. In the absence of clear, diagnostic spectral features, the composition of this low-albedo (or "dark") material is generally inferred to be carbon-rich, but the...
Authors
D. P. Cruikshank, E. Wegryn, Ore Dalle, R. H. Brown, J.-P. Bibring, B. J. Buratti, R. N. Clark, T. B. McCord, P. D. Nicholson, Y.J. Pendleton, T.C. Owen, G. Filacchione, A. Coradini, P. Cerroni, F. Capaccioni, R. Jaumann, R.M. Nelson, K. H. Baines, Christophe Sotin, G. Bellucci, M. Combes, Y. Langevin, B. Sicardy, D. L. Matson, V. Formisano, P. Drossart, V. Mennella
Mapping and interpretation of Sinlap crater on Titan using Cassini VIMS and RADAR data Mapping and interpretation of Sinlap crater on Titan using Cassini VIMS and RADAR data
Only a few impact craters have been unambiguously detected on Titan by the Cassini-Huygens mission. Among these, Sinlap is the only one that has been observed both by the RADAR and VIMS instruments. This paper describes observations at centimeter and infrared wavelengths which provide complementary information about the composition, topography, and surface roughness. Several units appear...
Authors
S. Le Mouelic, P. Paillou, M.A. Janssen, J. W. Barnes, S. Rodriguez, Christophe Sotin, R. H. Brown, K. H. Baines, B. J. Buratti, R. N. Clark, M. Crapeau, P.J. Encrenaz, R. Jaumann, D. Geudtner, F. Paganelli, L. Soderblom, G. Tobie, S. Wall
Identification of spectral units on Phoebe Identification of spectral units on Phoebe
We apply a multivariate statistical method to the Phoebe spectra collected by the VIMS experiment onboard the Cassini spacecraft during the flyby of June 2004. The G-mode clustering method, which permits identification of the most important features in a spectrum, is used on a small subset of data, characterized by medium and high spatial resolution, to perform a raw spectral...
Authors
A. Coradini, F. Tosi, A.I. Gavrishin, F. Capaccioni, P. Cerroni, G. Filacchione, A. Adriani, R. H. Brown, G. Bellucci, V. Formisano, E. D’Aversa, J. I. Lunine, K. H. Baines, J.-P. Bibring, B. J. Buratti, R. N. Clark, D. P. Cruikshank, M. Combes, P. Drossart, R. Jaumann, Y. Langevin, D. L. Matson, T. B. McCord, V. Mennella, R.M. Nelson, P. D. Nicholson, B. Sicardy, Christophe Sotin, M.M. Hedman, G. B. Hansen, C. A. Hibbitts, M. Showalter, C. Griffith, G. Strazzulla
Compositional mapping of Saturn's satellite Dione with Cassini VIMS and implications of dark material in the Saturn system Compositional mapping of Saturn's satellite Dione with Cassini VIMS and implications of dark material in the Saturn system
Cassini VIMS has obtained spatially resolved imaging spectroscopy data on numerous satellites of Saturn. A very close fly-by of Dione provided key information for solving the riddle of the origin of the dark material in the Saturn system. The Dione VIMS data show a pattern of bombardment of fine, sub-0.5-??m diameter particles impacting the satellite from the trailing side direction...
Authors
R. N. Clark, J. M. Curchin, R. Jaumann, D. P. Cruikshank, R. H. Brown, T.M. Hoefen, K. Stephan, Johnnie N. Moore, B. J. Buratti, K. H. Baines, P. D. Nicholson, R.M. Nelson
Orbital identification of carbonate-bearing rocks on Mars Orbital identification of carbonate-bearing rocks on Mars
Geochemical models for Mars predict carbonate formation during aqueous alteration. Carbonate-bearing rocks had not previously been detected on Mars' surface, but Mars Reconnaissance Orbiter mapping reveals a regional rock layer with near-infrared spectral characteristics that are consistent with the presence of magnesium carbonate in the Nili Fossae region. The carbonate is closely...
Authors
B.L. Ehlmann, J.F. Mustard, S.L. Murchie, F. Poulet, J.L. Bishop, A.J. Brown, W. M. Calvin, R. N. Clark, D.J. Des Marais, R.E. Milliken, L.H. Roach, T. L. Roush, G.A. Swayze, J.J. Wray
Complex structure within Saturn's infrared aurora Complex structure within Saturn's infrared aurora
The majority of planetary aurorae are produced by electrical currents flowing between the ionosphere and the magnetosphere which accelerate energetic charged particles that hit the upper atmosphere. At Saturn, these processes collisionally excite hydrogen, causing ultraviolet emission, and ionize the hydrogen, leading to H3+ infrared emission. Although the morphology of these aurorae is...
Authors
T. Stallard, S. Miller, M. Lystrup, N. Achilleos, E.J. Bunce, C.S. Arridge, M.K. Dougherty, S.W.H. Cowley, S.V. Badman, D.L. Talboys, R. H. Brown, K. H. Baines, B. J. Buratti, R. N. Clark, Christophe Sotin, P. D. Nicholson, P. Drossart
Opaline silica in young deposits on Mars Opaline silica in young deposits on Mars
High spatial and spectral resolution reflectance data acquired by the Mars Reconnaissance Orbiter Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) instrument reveal the presence of H2O- and SiOH-bearing phases on the Martian surface. The spectra are most consistent with opaline silica and glass altered to various degrees, confirming predictions based on geochemical...
Authors
Ralph E. Milliken, Gregg A. Swayze, Raymond E. Arvidson, Janice L Bishop, Roger N. Clark, Bethany L. Ehlmann, Robert O. Green, John P. Grotzinger, R.V. Morris, Scott L. Murchie, John F. Mustard, C. Weitz
Fluvial erosion and post-erosional processes on Titan Fluvial erosion and post-erosional processes on Titan
The surface of Titan has been revealed by Cassini observations in the infrared and radar wavelength ranges as well as locally by the Huygens lander instruments. Sand seas, recently discovered lakes, distinct landscapes and dendritic erosion patterns indicate dynamic surface processes. This study focus on erosional and depositional features that can be used to constrain the amount of...
Authors
R. Jaumann, R. H. Brown, K. Stephan, J. W. Barnes, L.A. Soderblom, Christophe Sotin, S. Le Mouelic, R. N. Clark, J. Soderblom, B. J. Buratti, R. Wagner, T. B. McCord, S. Rodriguez, K. H. Baines, D. P. Cruikshank, P. D. Nicholson, C.A. Griffith, M. Langhans, R. D. Lorenz
Distribution of icy particles across Enceladus' surface as derived from Cassini-VIMS measurements Distribution of icy particles across Enceladus' surface as derived from Cassini-VIMS measurements
The surface of Enceladus consists almost completely of water ice. As the band depths of water ice absorptions are sensitive to the size of particles, absorptions can be used to map variations of icy particles across the surface. The Visual and Infrared Mapping Spectrometer (VIMS) observed Enceladus with a high spatial resolution during three Cassini flybys in 2005 (orbits EN 003, EN 004...
Authors
R. Jaumann, K. Stephan, G. B. Hansen, R. N. Clark, B. J. Buratti, R. H. Brown, K. H. Baines, S.F. Newman, G. Bellucci, G. Filacchione, A. Coradini, D. P. Cruikshank, C.A. Griffith, C. A. Hibbitts, T. B. McCord, R.M. Nelson, P. D. Nicholson, Christophe Sotin, R. Wagner
The identification of liquid ethane in Titan's Ontario Lacus The identification of liquid ethane in Titan's Ontario Lacus
Titan was once thought to have global oceans of light hydrocarbons on its surface, but after 40 close flybys of Titan by the Cassini spacecraft, it has become clear that no such oceans exist. There are, however, features similar to terrestrial lakes and seas, and widespread evidence for fluvial erosion, presumably driven by precipitation of liquid methane from Titan's dense, nitrogen...
Authors
R. H. Brown, L.A. Soderblom, J.M. Soderblom, R. N. Clark, R. Jaumann, J. W. Barnes, Christophe Sotin, B. Buratti, K. H. Baines, P. D. Nicholson
Phyllosilicate and sulfate-hematite deposits within Miyamoto crater in Southern Sinus Meridiani, Mars Phyllosilicate and sulfate-hematite deposits within Miyamoto crater in Southern Sinus Meridiani, Mars
Orbital topographic, image, and spectral data show that sulfate- and hematite-bearing plains deposits similar to those explored by the MER rover Opportunity unconformably overlie the northeastern portion of the 160 km in diameter Miyamoto crater. Crater floor materials exhumed to the west of the contact exhibit CRISM and OMEGA NIR spectral signatures consistent with the presence of Fe/Mg...
Authors
S.M. Wiseman, R. E. Arvidson, J. C. Andrews-Hanna, R. N. Clark, N.L. Lanza, D. des Marais, G.A. Marzo, R.V. Morris, S.L. Murchie, Horton E. Newsom, E.Z. Noe Dobrea, A.M. Ollila, F. Poulet, T. L. Roush, F.P. Seelos, G.A. Swayze
Hydrated silicate minerals on Mars observed by the Mars Reconnaissance Orbiter CRISM instrument Hydrated silicate minerals on Mars observed by the Mars Reconnaissance Orbiter CRISM instrument
Phyllosilicates, a class of hydrous mineral first definitively identified on Mars by the OMEGA (Observatoire pour la Mineralogie, L’Eau, les Glaces et l’Activitié) instrument1,2, preserve a record of the interaction of water with rocks on Mars. Global mapping showed that phyllosilicates are widespread but are apparently restricted to ancient terrains and a relatively narrow range of...
Authors
J.F. Mustard, S.L. Murchie, S.M. Pelkey, B.L. Ehlmann, R.E. Milliken, J. A. Grant, J.-P. Bibring, F. Poulet, J. Bishop, E. N. Dobrea, L. Roach, F. Seelos, R. E. Arvidson, S. Wiseman, R. Green, C. Hash, D. Humm, E. Malaret, J.A. McGovern, K. Seelos, T. Clancy, R. Clark, D. des Marais, N. Izenberg, A. Knudson, Y. Langevin, T. Martin, P. McGuire, Robert Morris, M. Robinson, T. Roush, M. Smith, G. Swayze, H. Taylor, T. Titus, M. Wolff