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Results of measurements with the Planetary Fourier Spectrometer onboard Mars Express: Clouds and dust at the end of southern summer. A comparison with OMEGA images
Bibring, J. -P.; Bellucci, G.; Altieri, F. +22 more
We discuss the results of measurements made with the Planetary Fourier Spectrometer (PFS) onboard the Mars Express spacecraft. The data were obtained in the beginning of the mission and correspond to the end of summer in the southern hemisphere of Mars ( L s ∼ 340°). Three orbits are considered, two of which passed through volcanoes O…
Planetary science: Titan's exotic weather
Griffith, Caitlin A.
Titan is viewed as a sibling of Earth, as both bodies have rainy weather systems and landscapes formed by rivers. But as we study these similarities, Titan emerges as an intriguingly foreign world.
EUV line intensity distribution in the solar atmosphere: differences between a polar coronal hole and its equatorial extension
Raju, K. P.; Bromage, B. J. I.
Intensity histograms of 14 EUV emission lines in a polar coronal hole, its equatorial extension, the "Elephant's Trunk", and the adjacent quiet Sun regions have been obtained from SOHO/CDS observations made in August and September 1996. Differences between the quiet region and coronal hole on the one hand, and the polar hole and the equatorial ext…
Imaging techniques for gamma-ray diffuse emission: application to INTEGRAL/SPI
Roques, J. -P.; Allain, M.
Diffuse imaging in the gamma-ray energy range is a challenging problem, since faint radiation is usually mixed with strong instrumental background components. This situation results in data sets that are not very informative, so they lead to non robust image reconstruction. In this paper, we used a Bayesian approach to produce sky-maps with high r…
Top layers charaterization of the Martian surface: Permittivity estimation based on geomorphology analysis
Kofman, W.; Herique, A.; Nouvel, J. -F. +1 more
Mars Express spacecraft inserted successfully Martian orbit at the end of 2003. On board this probe, a radar instrument called MARSIS (for Mars Advanced Radar for Surface and Ionosphere Sounding) is looking for water inside the first kilometers of Martian crust. To support MARSIS planning and data inversion, Laboratoire de Planétologie de Grenoble…
From Hubble diagrams to scale factors
Tilquin, A.; Schücker, T.
Context: .
Aims: .We study the image of the transform from scale parameters to Hubble diagrams and present a lower bound on the radius of the universe today a0 and a monotonicity constraint on the Hubble diagram.
Methods: .Our theoretical input is minimal: Einstein's kinematics and maximally symmetric universes.
Results: .Pr…
Determination of local surface properties using Mars Express bistatic radar
Tyler, G. Leonard; Pätzold, Martin; Häusler, Bernd +1 more
Dual-frequency bistatic radar experiments were conducted with Mars Express at a rate of one to two per month during 2005. Each observation provided power measurements of orthogonally polarized surface echoes at one specular point; the ratio of these components yielded values of the dielectric constant in the range 2.0 < $\varepsilon$ < 4.0. …
Non-radial pulsations in the γ Doradus star HD 195068
Mathias, P.; Jankov, S.; Chapellier, E. +2 more
We present high resolution spectroscopic observations of the γ Doradus star
INTEGRAL and RXTE power spectra of Cygnus X-1
Nowak, M. A.; Wilms, J.; Pottschmidt, K. +3 more
We evaluate 0.03 20 Hz power spectra of the bright black hole binary Cyg X-1 obtained from non-deconvolved INTEGRAL-ISGRI event data. The ISGRI power spectra are compared to contemporary RXTE-PCA ones in the same hard X-ray energy band of 15 70 keV. They agree well in shape. Since the ISGRI power spectrum of Cyg X-1 is not background corrected it …
The color signature of the transit of HD 209458: discrepancies between stellar atmospheric models and observations
Tingley, B.; Thurl, C.; Sackett, P.
Exoplanetary transits produce a double-horned color signature that is distinct from both binaries and blends and can thus be used to separate exoplanets from false positives in transit searches. Color photometry with precision sufficient to detect this signal in transits of HD 209458 is available in the literature. Analysis of these observations r…