Search Publications
Properties and dynamics of Jupiter's gossamer rings from Galileo, Voyager, Hubble and Keck images
de Pater, Imke; Hamilton, Douglas P.; Showalter, Mark R. +2 more
We present a comprehensive examination of Jupiter's "gossamer" rings based on images from Voyager, Galileo, the Hubble Space Telescope and the W.M. Keck Telescope. We compare our results to the simple dynamical model of Burns et al. [Burns, J.A., Showalter, M.R., Hamilton, D.P., Nicholson, P.D., de Pater, I., Ockert-Bell, M., Thomas, P., 1999. Sci…
Cluster AgeS Experiment (CASE): deficiency of observed dwarf novae in globular clusters
Pietrukowicz, P.; Thompson, I. B.; Schwarzenberg-Czerny, A. +4 more
We present the results of a search for dwarf novae (DNe) in globular clusters (GCs). It is based on the largest available homogeneous sample of observations, in terms of the time-span, number of observations and number of clusters. It includes 16 Galactic GCs and yielded two new certain DNe: M55-CV1 and M22-CV2. All previously known systems locate…
Stellar Populations in the Andromeda V Dwarf Spheroidal Galaxy
Sarajedini, Ata; Mancone, Conor
Using archival imaging from the Wide Field Planetary Camera 2 aboard the Hubble Space Telescope, we investigate the stellar populations of the Local Group dwarf spheroidal Andromeda V—a companion satellite galaxy of M31. The color-magnitude diagram extends from above the first ascent red giant branch (RGB) tip to approximately 1 mag below the hori…
Comparisons between Isothermal and NFW Mass Profiles for Strong-Lensing Galaxy Clusters
Huang, J. -S.; Mellier, Yannick; Bartelmann, Matthias +3 more
While both isothermal and NFW-based mass models for galaxy clusters are widely adopted in strong-lensing studies, they cannot easily be distinguished based solely on observed positions of arcs and arclets. We compare the magnifications predicted for giant arcs obtained from isothermal and NFW profiles, taking axially symmetric and asymmetric mass …
Embedded clusters in NGC 1808 central starburst. Near-infrared imaging and spectroscopy
Alloin, D.; Galliano, E.
Context: In the course of a mid-infrared imaging campaign of close-by active galaxies, we discovered the mid-infrared counterparts of bright compact radio sources in the central star-forming region of NGC 1808.
Aims: We aim at confirming that these sources are deeply embedded, young star clusters and at deriving some of their intrinsic propert…
Imaging ejecta from the final flash star V605 Aquilae
Lebzelter, T.; Hinkle, K. H.; Joyce, R. R. +4 more
Aims:We investigated the cloud of ejecta resulting from the mass loss associated with the final helium shell flash in V605 Aql.
Methods: V605 Aql was imaged at high spatial resolution in both optical emission lines and the infrared continuum using HST/WFPC2 and Gemini/Hokupa'a+QUIRC, respectively. The He I 10 830 Å spectrum was also observed. …
Identification of Saturn's magnetospheric regions and associated plasma processes: Synopsis of Cassini observations during orbit insertion
Schippers, P.; André, N.; Gurnett, D. A. +29 more
Saturn's magnetosphere is currently studied from the microphysical to the global scale by the Cassini-Huygens mission. During the first half of 2004, in the approach phase, remote sensing observations of Saturn's magnetosphere gave access to its auroral, radio, UV, energetic neutral atom, and dust emissions. Then, on 1 July 2004, Cassini Saturn or…
The corona and upper transition region of epsilon Eridani
Ness, J. -U.; Jordan, C.
We present analyses of observations of epsilon Eridani (K2 V) made with the Low Energy Transmission Grating Spectrometer onboard Chandra and the Extreme Ultraviolet Explorer, supplemented by observations made with the Space Telescope Imaging Spectrograph, the Far Ultraviolet Spectroscopic Explorer and the Reflection Grating Spectrometer onboard XM…
First observation of 628 CO 2 isotopologue band at 3.3 µm in the atmosphere of Venus by solar occultation from Venus Express
Bertaux, Jean-Loup; Vandaele, Ann Carine; Montmessin, F. +5 more
The new ESA Venus Express orbiter is the first mission applying the probing technique of solar and stellar occultation to the atmosphere of Venus, with the SPICAV/SOIR instrument. SOIR is a new type of spectrometer used for solar occultations in the range 2.2-4.3 µm. Thanks to a high spectral resolving power R∼15,000-20,000 (unprecedented in…
Retreat and reformation of X-line during quasi-continuous tailward-of-the-cusp reconnection under northward IMF
Khotyaintsev, Y.; Vaivads, A.; Hasegawa, H. +6 more
We present observations on 19-20 November 2006 by the Cluster spacecraft that were skimming the high-latitude dusk-flank magnetopause, which are consistent with more than one reconnection X-line present on the tailward side of the cusp under northward IMF. Evidence of quasi-continuous reconnection over 16 hours exists in the form of Alfvénic accel…