Search Publications
An occultation event in the nucleus of the planetary nebula M 2-29
Zijlstra, A. A.; Hajduk, M.; Gesicki, K.
Aims: Eclipses and occultations of post-AGB stars provide a powerful method of exploring the near-stellar environment, including close companions and circumstellar debris disks. Only six eclipsing systems and one dust-occultation system are currently known. New cases are important for our understanding of binary evolution during the AGB mass-loss …
Dust ring formation due to ice sublimation of radially drifting dust particles under the Poynting Robertson effect in debris disks
Kimura, Hiroshi; Kobayashi, Hiroshi; Watanabe, Sei-ichiro +1 more
In a disk with a low optical depth, dust particles drift radially inward by the Poynting-Robertson (P-R) drag rather than are blown out by stellar radiation pressure following destructive collisions. We investigate the radial distribution of icy dust composed of pure ice and refractory materials in dust-debris disks taking into account the P-R dra…
The structure and dynamics of a bright point as seen with Hinode, SoHO and TRACE
Doyle, J. G.; Madjarska, M. S.; Maclean, R. C. +1 more
Context: Solar coronal bright points have been studied for more than three decades, but some fundamental questions about their formation and evolution still remain unanswered.
Aims: Our aim is to determine the plasma properties of a coronal bright point and compare its magnetic topology extrapolated from magnetogram data with its appearance in…
Where are the hot ion lines in classical T Tauri stars formed?
Schmitt, J. H. M. M.; Günther, H. M.
Context: Classical T Tauri stars (hereafter CTTS) show a plethora of in- and outflow signatures in a variety of wavelength bands.
Aims: In order to constrain gas velocities and temperatures, we analyse the emission in the hot ion lines.
Methods: We use all available archival FUSE spectra of CTTS to measure the widths, fluxes and shifts of …
Columbia Hills, Mars: Aeolian features seen from the ground and orbit
Greeley, Ronald; Whelley, Patrick L.; Neakrase, Lynn D. V. +15 more
Abundant wind-related features occur along Spirit's traverse into the Columbia Hills over the basaltic plains of Gusev Crater. Most of the windblown sands are probably derived from weathering of rocks within the crater, and possibly from deposits associated with Ma'adim Vallis. Windblown particles act as agents of abrasion, forming ventifacts, and…
Identification of spectral units on Phoebe
Sotin, C.; Brown, R. H.; Baines, K. H. +31 more
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 resoluti…
A Puzzling Millisecond Pulsar Companion in NGC 6266
Possenti, A.; Beccari, G.; D'Amico, N. +5 more
We report on the optical identification of the companion to the eclipsing millisecond pulsar PSR J1701-3006B in the globular cluster NGC 6266. A relatively bright star with an anomalous red color and an optical variability (~0.2 mag) that nicely correlates with the orbital period of the pulsar (~0.144 days) has been found nearly coincident with th…
Tropospheric carbon monoxide concentrations and variability on Venus from Venus Express/VIRTIS-M observations
Drossart, Pierre; Irwin, Patrick G. J.; Piccioni, Giuseppe +7 more
We present nightside observations of tropospheric carbon monoxide in the southern hemisphere near the 35 km height level, the first from Venus Express/Visible and Infrared Thermal Imaging Spectrometer (VIRTIS)-M-IR. VIRTIS-M data from 2.18 to 2.50 µm, with a spectral resolution of 10 nm, were used in the analysis. Spectra were binned, with w…
Cluster observations of ``crater'' flux transfer events at the dayside high-latitude magnetopause
Balogh, A.; RèMe, H.; Fazakerley, A. N. +7 more
On 11 January 2002 Cluster detected two "crater"-like flux transfer event (FTE) signatures. The four spacecraft were in quasi-linear formation, spread over ∼2 RE in the magnetopause normal direction, and sample a range of distances from it. The observations occur near a southward turning of the IMF, but no solar wind pressure pulses are…
Extended Red Emission and the evolution of carbonaceous nanograins in NGC 7023
Cuillandre, J. -C.; Joblin, C.; Thomas, J. +3 more
Context: Extended Red Emission (ERE) was recently attributed to the photo-luminescence of either doubly ionized Polycyclic Aromatic Hydrocarbons (PAH++), or charged PAH dimers ([PAH{2}] ^+).
Aims: We analysed the visible and mid-infrared (mid-IR) dust emission in the North-West and South photo-dissociation regions of the reflection …