Search Publications
Applications of Electrified Dust and Dust Devil Electrodynamics to Martian Atmospheric Electricity
Montmessin, F.; Berthelier, J. J.; Farrell, W. M. +12 more
Atmospheric transport and suspension of dust frequently brings electrification, which may be substantial. Electric fields of 10 kV m-1 to 100 kV m-1 have been observed at the surface beneath suspended dust in the terrestrial atmosphere, and some electrification has been observed to persist in dust at levels to 5 km, as well a…
The Relation between Solar Eruption Topologies and Observed Flare Features. II. Dynamical Evolution
Pariat, E.; DeLuca, E. E.; McKillop, S. +4 more
A long-established goal of solar physics is to build understanding of solar eruptions and develop flare and coronal mass ejection (CME) forecasting models. In this paper, we continue our investigation of nonlinear forces free field (NLFFF) models by comparing topological properties of the solutions to the evolution of the flare ribbons. In particu…
Critical study of the distribution of rotational velocities of Be stars. I. Deconvolution methods, effects due to gravity darkening, macroturbulence, and binarity
Cidale, L.; Frémat, Y.; Royer, F. +9 more
Context. Among intermediate-mass and massive stars, Be stars are the fastest rotators in the main sequence (MS) and, as such, these stars are a cornerstone to validate models of structure and evolution of rotating stars. Several phenomena, however, induce under- or overestimations either of their apparent Vsini, or true velocity V.
Aims: In t…
CLASH-VLT: Environment-driven evolution of galaxies in the z = 0.209 cluster Abell 209
Demarco, R.; Moustakas, J.; Grillo, C. +19 more
Context. The analysis of galaxy properties, such as stellar masses, colors, sizes and morphologies, and the relations among them and the environment, in which the galaxies reside, can be used to investigate the physical processes driving galaxy evolution.
Aims: We conduct a thorough study of the cluster A209 with a new large spectro-photometr…
A model for stealth coronal mass ejections
Luhmann, J. G.; Li, Y.; Masson, S. +4 more
Stealth coronal mass ejections (CMEs) are events in which there are almost no observable signatures of the CME eruption in the low corona but often a well-resolved slow flux rope CME observed in the coronagraph data. We present results from a three-dimensional numerical magnetohydrodynamics (MHD) simulation of the 1-2 June 2008 slow streamer blowo…
Planck intermediate results. XXXVIII. E- and B-modes of dust polarization from the magnetized filamentary structure of the interstellar medium
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +192 more
The quest for a B-mode imprint from primordial gravity waves on the polarization of the cosmic microwave background (CMB) requires the characterization of foreground polarization from Galactic dust. We present a statistical study of the filamentary structure of the 353 GHz Planck Stokes maps at high Galactic latitude, relevant to the study of dust…
Interplanetary Coronal Mass Ejections Observed by MESSENGER and Venus Express
Forsyth, R. J.; Good, S. W.
Interplanetary coronal mass ejections (ICMEs) observed by the MESSENGER and Venus Express spacecraft have been catalogued and analysed. The ICMEs were identified by a relatively smooth rotation of the magnetic field direction consistent with a flux rope structure, coinciding with a relatively enhanced magnetic field strength. A total of 35 ICMEs w…
The Very Massive Star Content of the Nuclear Star Clusters in NGC 5253
Crowther, P. A.; Calzetti, D.; Smith, L. J. +1 more
The blue compact dwarf galaxy NGC 5253 hosts a very young starburst containing twin nuclear star clusters, separated by a projected distance of 5 pc. One cluster (#5) coincides with the peak of the Hα emission and the other (#11) with a massive ultracompact H II region. A recent analysis of these clusters shows that they have a photometric age of …
Discovery of a Substellar Companion to the Nearby Debris Disk Host HR 2562
Matthews, Brenda C.; Duchêne, Gaspard; Esposito, Thomas M. +54 more
We present the discovery of a brown dwarf companion to the debris disk host star HR 2562. This object, discovered with the Gemini Planet Imager (GPI), has a projected separation of 20.3 ± 0.3 au (0\buildrel{\prime\prime}\over{.} 618+/- 0\buildrel{\prime\prime}\over{.} 004) from the star. With the high astrometric precision afforded by GPI, we have…
The mass and spin of the extreme Narrow Line Seyfert 1 Galaxy 1H 0707-495 and its implications for the trigger for relativistic jets
Done, Chris; Jin, Chichuan
Relativistic reflection models of the X-ray spectrum of the `complex' Narrow Line Seyfert 1 (NLS1) 1H 0707-495 require a high-spin, moderate-inclination, low-mass black hole. With these parameters fixed, the observed optical/UV emission directly determines the mass accretion rate through the outer disc and hence predicts the bolometric luminosity.…