Search Publications

Philae's First Days on the Comet

Bibring, J. -P.; Mottola, S.; Alexander, C. +10 more

Stellar laboratories. IV. New Ga iv, Ga v, and Ga vi oscillator strengths and the gallium abundance in the hot white dwarfs G191-B2B and RE 0503-289

Rauch, T.; Werner, K.; Kruk, J. W. +1 more

Context. For the spectral analysis of high-resolution and high-signal-to-noise (S/N) spectra of hot stars, advanced non-local thermodynamic equilibrium (NLTE) model atmospheres are mandatory. These atmospheres are strongly dependent on the reliability of the atomic data that are used to calculate them.
Aims: Reliable Ga iv-vi oscillator stren…

Ultraviolet Spectroscopy of Type IIb Supernovae: Diversity and the Impact of Circumstellar Material

Filippenko, Alexei V.; Modjaz, Maryam; Smith, Nathan +9 more

We present new Hubble Space Telescope (HST) multi-epoch ultraviolet (UV) spectra of the bright Type IIb SN 2013df, and undertake a comprehensive analysis of the set of four SNe IIb for which HST UV spectra are available (SN 1993J, SN 2001ig, SN 2011dh, and SN 2013df). We find strong diversity in both continuum levels and line features among these …

Integrating CRISM and TES hyperspectral data to characterize a halloysite-bearing deposit in Kashira crater, Mars

Mustard, John F.; Goudge, Timothy A.; Head, James W. +2 more

We present morphologic observations and spectral modeling results of a large, kaolin-group mineral-bearing deposit within Kashira crater in the southern highlands of Mars. We employ both non-linear unmixing of Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) visible to near-infrared (VNIR) reflectance data and linear unmixing of Therma…

Models of red giants in the CoRoT asteroseismology fields combining asteroseismic and spectroscopic constraints

Eggenberger, P.; Valentini, M.; Poretti, E. +17 more

Context. The availability of asteroseismic constraints for a large sample of red giant stars from the CoRoT and Kepler missions paves the way for various statistical studies of the seismic properties of stellar populations.
Aims: We use a detailed spectroscopic study of 19 CoRoT red giant stars to compare theoretical stellar evolution models …

67P/Churyumov-Gerasimenko surface properties as derived from CIVA panoramic images

Le Mouélic, S.; Bibring, J. -P.; Gondet, B. +8 more

The structure and composition of cometary constituents, down to their microscopic scale, are critical witnesses of the processes and ingredients that drove the formation and evolution of planetary bodies toward their present diversity. On board Rosetta’s lander Philae, the Comet Infrared and Visible Analyser (CIVA) experiment took a series of imag…

The Herschel Virgo Cluster Survey. XVIII. Star-forming dwarf galaxies in a cluster environment

Boquien, M.; Bianchi, S.; Fritz, J. +22 more

To assess the effects of the cluster environment on the different components of the interstellar medium, we analyse the far-infrared (FIR) and submillimetre (submm) properties of a sample of star-forming dwarf galaxies detected by the Herschel Virgo Cluster Survey (HeViCS). We determine dust masses and dust temperatures by fitting a modified black…

Preliminary study of Venus cloud layers with polarimetric data from SPICAV/VEx

Montmessin, Franck; Bertaux, Jean-Loup; Korablev, Oleg +4 more

We present unique polarization data from the SPICAV-IR spectrometer onboard ESA's Venus Express (VEx) spacecraft and a first retrieval of cloud parameters. The polarization data have been collected from 2006 to 2010, and cover mostly the northern hemisphere, in the 0.65 to 1.7 µm spectral range. They contain information about latitudinal and…

Polytropic index of central plasma sheet ions based on MHD Bernoulli integral

Ma, Yuduan; Wang, Jing; Cao, Jinbin +8 more

This paper uses the data of Cluster from 2001 to 2009 to study the polytropic processes of central plasma sheet (CPS) ions. We first adopt the approach of MHD Bernoulli integral (MBI) to identify homogeneous streamflow tubes (quasi-invariant MBI regions) and then calculate the polytropic index of ions for those streamflow tubes whose outward elect…

Enceladus’ Geysers: Relation to Geological Features

Porco, Carolyn C.; Helfenstein, Paul

We apply histogram analysis, photogeological methods, and tidal stress modeling to Porco et al.'s survey of 101 Enceladus South Polar Basin geysers and their three-dimensional orientations to test if the jet azimuths are influenced by their placement relative to surface morphology and tectonic structures. Geysers emplaced along the three most acti…