Search Publications
A Narrow Streamer-Puff Coronal Mass Ejection from the Nonradial Eruption of an Active-Region Filament
Yang, Jiayan; Bi, Yi; Zheng, Ruisheng +2 more
So-called streamer-puff coronal mass ejections (CMEs) were recently identified by Bemporad et al. as a new variety of CME. They originate from nonradial ejecta from compact ejective flares occurring in the outskirts of the base of a streamer and travel out along it, during which the streamer is transiently inflated by the puff but is not disrupted…
Properties of Galaxies Hosting X-ray-selected Active Galactic Nuclei in the CL1604 Supercluster at z = 0.9
Kocevski, Dale D.; Fassnacht, Christopher D.; Lubin, Lori M. +4 more
Recent galaxy evolution models suggest that feedback from active galactic nuclei (AGNs) may be responsible for suppressing star formation in their host galaxies and the subsequent migration of these systems onto the red sequence. To investigate the role of AGNs in driving the evolution of their hosts, we have carried out a study of the environment…
Planetary transit candidates in the CoRoT initial run: resolving their nature
Mazeh, T.; Aigrain, S.; Alonso, R. +45 more
With the release of CoRoT lightcurves of the Initial Run IRa01, 50 transiting planetary candidates have been published in a companion paper. About twenty of them were identified as binary stars from the CoRoT lightcurve itself. Complementary observations were conducted for 29 candidates, including ground-based photometry and radial-velocity measur…
Magnetic turbulence in space plasmas: Scale-dependent effects of anisotropy
Perri, S.; André, M.; Bruno, R. +4 more
The presence of a background magnetic field induces anisotropy in magnetic turbulence. Understanding properties of anisotropy is important to characterize turbulence power spectrum. This paper presents a case study of anisotropy by using a minimum variance analysis, in three different regions of the heliosphere, namely in the solar wind, and in th…
Efficient Pseudo-Global Fitting for Helioseismic Data
Chaplin, W. J.; Elsworth, Y.; Fletcher, S. T. +1 more
Mode fitting or "peak bagging" is an important procedure in helioseismology allowing one to determine the various mode parameters of solar oscillations. Here we describe a way of reducing the systematic bias in the fits of certain mode parameters that are seen when using "local" fitting techniques to analyze the Sun-as-a-star p-mode power spectrum…
The galactic unclassified B[e] star HD 50138. I. A possible new shell phase
Meilland, A.; Domiciano de Souza, A.; Chesneau, O. +4 more
Context: The observed spectral variation of HD 50138 has led different authors to classify it in a very wide range of spectral types and luminosity classes (from B5 to A0 and III to Ia) and at different evolutionary stages as either HAeBe star or classical Be.
Aims: Based on new high-resolution optical spectroscopic data from 1999 and 2007 ass…
Low-ionization pairs of knots in planetary nebulae: physical properties and excitation
Corradi, R. L. M.; Gonçalves, D. R.; Mampaso, A. +1 more
We obtained optical long-slit spectra of four planetary nebulae (PNe) with low-ionization pair of knots, namely He 1-1, IC 2149, KjPn 8 and NGC 7662.
These data allow us to derive the physical parameters and excitation of the pairs of knots, and those of higher ionization inner components of the nebulae, separately. Our results are as fo…The location and kinematics of the coronal-line emitting regions in active galactic nuclei
Done, C.; Ferland, G. J.; Mullaney, J. R. +2 more
We use the photoionization code CLOUDY to determine both the location and the kinematics of the optical forbidden, high-ionization line (hereafter, FHIL) emitting gas in the narrow line Seyfert 1 galaxy Ark 564. The results of our models are compared with the observed properties of these emission lines to produce a physical model that is used to e…
A submillimetre search for cold extended debris disks in the β Pictoris moving group
Fridlund, M.; Olofsson, G.; Liseau, R. +4 more
Context: Previous observations with the Infrared Astronomical Satellite and the Infrared Space Observatory, and ongoing observations with Spitzer and AKARI, have led to the discovery of over 200 debris disks, based on detected mid- and far infrared excess emission, indicating warm circumstellar dust. To constrain the properties of these systems, e…
Regions associated with electron physics in asymmetric magnetic field reconnection
Pritchett, P. L.; Mozer, F. S.
Spatial relationships between regions containing signatures of electron physics in asymmetric reconnection with a guide field are examined using simulations and space observations that are in excellent agreement. These electron physics regions do not completely overlap, are not confined to sizes ∼electron skin depth, and do not surround the X-line…