Search Publications
The inversion layer of electric fields and electron phase-space-hole structure during two-dimensional collisionless magnetic reconnection
Lefebvre, Bertrand; Chen, Li-Jen; Torbert, Roy B. +1 more
Based on two-dimensional fully kinetic simulations that resolve the electron diffusion layer in undriven collisionless magnetic reconnection with zero guide field, this paper reports the existence and evolution of an inversion layer of bipolar electric fields, its corresponding phase-space structure (an electron-hole layer), and the implication to…
X-ray evidence for the accretion disc-outflow connection in 3C 111
Reynolds, C. S.; Tombesi, F.; Reeves, J. N. +2 more
We present the spectral analysis of three Suzaku X-ray Imaging Spectrometer observations of 3C 111 requested to monitor the predicted variability of its ultrafast outflow on ∼7 d time-scales. We detect an ionized iron emission line in the first observation and a blueshifted absorption line in the second, when the flux is ∼30 per cent higher. The l…
A magnetar strength surface magnetic field for the slowly spinning down SGR 0418+5729
Göǧüş, Ersin; Güver, Tolga; Özel, Feryal
The observed upper bound on the spin-down rate of the otherwise typical soft gamma-ray repeater SGR 0418+5729 has challenged the interpretation of this source as a neutron star with ultrastrong magnetic fields. Current limits imply a dipole magnetic field strength of less than 7.5 × 1012 G, which is significantly smaller than that of a …
First stars. XV. Third-peak r-process element and actinide abundances in the uranium-rich star CS31082-001
Bonifacio, P.; Spite, M.; Nordström, B. +12 more
Context. A small fraction of extremely metal-poor (EMP) stars exhibit moderate to extreme excesses of heavy neutron-capture elements produced in the r-process. The production site(s) of these elements in the early Galaxy remain(s) unclear, as is the reason for their occasional enhancement in the otherwise regular pattern of abundances of elements …
The Widest-separation Substellar Companion Candidate to a Binary T Tauri Star
Kuzuhara, M.; Tamura, M.; Ishii, M. +3 more
The results of near-infrared imaging and spectroscopy of a substellar companion (SR12 C), with a possible planetary mass, of a binary T Tauri star (SR12 AB) in the ρ Ophiuchi star-forming region are presented. The object is separated by ~8farcs7, corresponding to ~1100 AU at 125 pc, and has an H-band brightness of 15.2 mag and infrared spectra sug…
Asteroid (21) Lutetia as a remnant of Earth’s precursor planetesimals
Jorda, L.; Lamy, P.; Groussin, O. +7 more
Isotopic and chemical compositions of meteorites, coupled with dynamical simulations, suggest that the main belt of asteroids between Mars and Jupiter contains objects formed in situ as well as a population of interlopers. These interlopers are predicted to include the building blocks of the terrestrial planets as well as objects that formed beyon…
A high-resolution three-dimensional model of the solar photosphere derived from Hinode observations
Socas-Navarro, H.
A new three-dimensional model of the solar photosphere is presented in this paper and made publicly available to the community. This model has the peculiarity of having been obtained by inverting spectro-polarimetric observations, rather than by using numerical radiation hydrodynamical simulations. The data used here are from the spectro-polarimet…
Multi-wavelength modeling of the spatially resolved debris disk of HD 107146
Ertel, S.; Wolf, S.; Carpenter, J. M. +5 more
Aims: We aim to constrain the location, composition, and dynamical state of planetesimal populations and dust around the young, sun-like (G2 V) star
Methods: We consider coronagraphic observations obtained with the Advanced Camera for Surveys (HST/ACS) onboard the Hubble Space Telescope (HST) in broad V (λ
Spectroscopic Observations of a Coronal Moreton Wave
Veronig, Astrid; Harra, Louise K.; Sterling, Alphonse C. +1 more
We observed a coronal wave (EIT wave) on 2011 February 16, using EUV imaging data from the Solar Dynamics Observatory/Atmospheric Imaging Assembly (AIA) and EUV spectral data from the Hinode/EUV Imaging Spectrometer (EIS). The wave accompanied an M1.6 flare that produced a surge and a coronal mass ejection (CME). EIS data of the wave show a promin…
Planetary period oscillations in Saturn's magnetosphere: Evidence in magnetic field phase data for rotational modulation of Saturn kilometric radiation emissions
Dougherty, M. K.; Cecconi, B.; Lamy, L. +4 more
Initial Voyager observations of Saturn kilometric radiation (SKR) indicated that the modulations in emitted power near the ∼11 h planetary rotation period are “strobe like,” varying with a phase independent of observer position, while subsequent Cassini studies of related oscillations in the magnetospheric magnetic field and plasma parameters have…