Search Publications
Titan's surface: Search for spectral diversity and composition using the Cassini VIMS investigation
Sotin, Christophe; Barnes, Jason W.; Le Mouélic, Stéphane +11 more
The surface composition of Titan is of great importance for understanding both the internal evolution of Titan and its atmosphere. The Visual and Infrared Mapping Spectrometer (VIMS) investigation on Cassini is observing Titan from 0.35 to 5.11 µm with spatial resolution down to a few kilometers during each flyby of the spacecraft as it orbi…
Resurfacing of Titan by ammonia-water cryomagma
Showman, Adam P.; Lopes, Rosaly M. C.; Lunine, Jonathan I. +1 more
The Cassini Titan Radar Mapper observed on Titan several large features interpreted as cryovolcanic during the October 26, 2004 pass at high northern latitudes [Lopes, R.M.C., and 43 colleagues, 2007. Icarus 186, 395-412]. To date, models of ammonia-water resurfacing have not been tied to specific events or evolutionary stages of Titan. We propose…
Detection of the 2175 Å extinction feature and 21-cm absorption in two MgII systems at z ~ 1.3
Petitjean, P.; Saikia, D. J.; Srianand, R. +2 more
We have discovered two dusty intervening MgII absorption systems at z ~ 1.3 in the Sloan Digital Sky Survey (SDSS) data base. The overall spectra of both quasi-stellar objects (QSOs) are red (u - K > 4.5mag) and are well modelled by the composite QSO spectrum reddened by the extinction curve from the Large Magellanic Cloud (LMC2) Supershell red…
The Global Solar Magnetic Field Through a Full Sunspot Cycle: Observations and Model Results
Liu, Yang; Schrijver, Carolus J.
Based on 11 years of SOHO/MDI observations from the cycle minimum in 1997 to the next minimum around 2008, we compare observed and modeled axial dipole moments to better understand the large-scale transport properties of magnetic flux in the solar photosphere. The absolute value of the axial dipole moment in 2008 is less than half that in the corr…
2 Years of INTEGRAL Monitoring of GRS 1915+105. II. X-Ray Spectro-Temporal Analysis
Belloni, T.; Rodriguez, J.; Cadolle Bel, M. +14 more
This is the second paper presenting the results of 2 yr of monitoring of GRS 1915+105 with INTEGRAL, RXTE, and the Ryle Telescope. We present the X-ray spectral and temporal analysis of four observations showing strong radio to X-ray correlations. During one observation GRS 1915+105 was in a steady state, while during the three others it showed cy…
Sensitivity of helioseismic gravity modes to the dynamics of the solar core
Eff-Darwich, A.; García, R. A.; Mathur, S. +1 more
Context: The dynamics of the solar core cannot be properly constrained through the analysis of acoustic oscillation modes. Gravity modes (g modes) are necessary to understand the structure and dynamics of the deepest layers of the Sun. Through recent progress on the observation of these modes - both individually and collectively - new information …
Identifying XMM-Newton observations affected by solar wind charge exchange. Part I
Carter, J. A.; Sembay, S.
Aims: We describe a method for identifying XMM-Newton observations that have been affected by solar wind charge exchange (SWCX) emission and present preliminary results of previously unidentified cases of such emission within the XMM-Newton Science Archive.
Methods: The method is based on detecting temporal variability in the diffuse X-ray bac…
A latitudinal survey of CO, OCS, H2O, and SO2 in the lower atmosphere of Venus: Spectroscopic studies using VIRTIS-H
Drossart, P.; Piccioni, G.; Bézard, B. +3 more
The high-resolution channel (R $\simeq$ 2000) of the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) instrument (VIRTIS-H) aboard Venus Express has provided numerous spectra of the nightside infrared thermal emission in the 2.3-µm window. Mixing ratios of various minor species in the 30-40 km range could therefore be inferred usin…
Distribution of icy particles across Enceladus' surface as derived from Cassini-VIMS measurements
Sotin, C.; Brown, R. H.; Baines, K. H. +16 more
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 Cassi…
IMF dependence of high-latitude thermospheric wind pattern derived from CHAMP cross-track measurements
Liu, H.; Haaland, S. E.; Förster, M. +2 more
Neutral thermospheric wind pattern at high latitudes obtained from cross-track acceleration measurements of the CHAMP satellite above both North and South polar regions are statistically analyzed in their dependence on the Interplanetary Magnetic Field (IMF) direction in the GSM y-z plane (clock angle). We compare this dependency with magnetospher…