Search Publications
The haloes of planetary nebulae in the mid-infrared: evidence for interaction with the interstellar medium
Ramos-Larios, G.; Phillips, J. P.
The motion of planetary nebulae through the interstellar medium (ISM) is thought to lead to a variety of observational consequences, including the formation of bright rims, deformation and fragmentation of the shells, and a shift of the central stars away from the geometric centres of the envelopes. These and other characteristics have been noted …
Three-Dimensional Spectroscopic Study of the Line-Emitting Regions of Mrk 493
Moiseev, A. V.; Popović, L. Č.; Afanasiev, V. L. +2 more
We report the results of three-dimensional spectroscopic observations of Mrk 493 (narrow-line Seyfert 1 galaxy) with the integral-field spectrograph MultiPupil Fiber Spectrograph of the Special Astrophysical Observatory of the Russian Academy of Sciences 6 m telescope. The difference in the slope of the optical continuum emission intensity across …
The jovian anticyclone BA. I. Motions and interaction with the GRS from observations and non-linear simulations
Hueso, R.; Sánchez-Lavega, A.; García-Melendo, E. +5 more
A study of the dynamics of the second largest anticyclone in Jupiter, Oval BA, and its red colour change that occurred in late 2005 is presented in a three part study. The first part, this paper, deals with its long-term kinematical and dynamical behaviour monitored since its formation in 2000 to September 2008 using ground-based observations arch…
Methanol on Enceladus
Hodyss, Robert; Goguen, Jay D.; Yung, Yuk L. +4 more
Near infrared spectra of the surface of Enceladus returned by Cassini show the presence of an absorption feature at 3.53 µm, ascribed by Brown et al. (2006) to “short chain organics,” and by Newman et al. (2007) to hydrogen peroxide. We assign this feature tentatively to methanol. Variations in the peak position of the feature suggest that m…
The X-ray Detectability of Electron Beams Escaping from the Sun
Krucker, Säm; Lin, Robert P.; Saint-Hilaire, Pascal +1 more
We study the detectability and characterization of electron beams as they leave their acceleration site in the low corona toward interplanetary space through their nonthermal X-ray bremsstrahlung emission. We demonstrate that the largest interplanetary electron beams (gsim1035 electrons above 10 keV) can be detected in X-rays with curre…
Grooves on small saturnian satellites and other objects: Characteristics and significance
Burns, Joseph A.; Morrison, Sarah J.; Thomas, Peter C. +2 more
High-resolution images from the Cassini Imaging Science Subsystem (ISS) show parallel sets of grooves on Epimetheus and Pandora. Grooves have previously been observed on other satellites and asteroids, including Phobos, Gaspra, Ida, Eros, and minor occurrences on Phoebe. Sets of parallel grooves are so far observed only on satellites known or like…
The Structure and Origin of Solar Plumes: Network Plumes
Wilhelm, K.; Gabriel, A.; Tison, E. +1 more
This study is based upon plumes seen close to the solar limb within coronal holes in the emission from ions formed in the temperature region of 1 MK, in particular, the band of Fe IX 171 Å from EIT on the Solar and Heliospheric Observatory. It is shown, using geometric arguments, that two distinct classes of structure contribute to apparently simi…
Hard X-ray observations of PSR J1833-1034 and its associated pulsar wind nebula
de Rosa, A.; Ubertini, P.; Bassani, L. +3 more
PSR J1833-1034 and its associated pulsar wind nebula (PWN) have been investigated in depth through X-ray observations ranging from 0.1 to 200 keV. The low-energy X-ray data from Chandra reveal a complex morphology that is characterized by a bright central plerion, no thermal shell and an extended diffuse halo. The spectral emission from the centra…
Removing systematics from the CoRoT light curves. I. Magnitude-dependent zero point
Mazeh, T.; Guterman, P.; Aigrain, S. +31 more
This paper presents an analysis that searched for systematic effects within the CoRoT exoplanet field light curves. The analysis identified a systematic effect that modified the zero point of most CoRoT exposures as a function of stellar magnitude. We could find this effect only after preparing a set of learning light curves that were relatively f…
Pre-nova X-ray observations of V2491 Cygni (Nova Cyg 2008b)
Mukai, K.; Hernanz, M.; Sala, G. +12 more
Classical novae are phenomena caused by explosive hydrogen burning onto an accreting white dwarf. Only one classical nova had been identified in X-rays before the actual optical outburst occurred (V2487 Oph). The recently discovered nova, V2491 Cyg, is one of the fastest (He/N) novae observed to date. Using archival ROSAT, XMM-Newton, and Swift da…