Search Publications
First astrometric reduction of Cassini Imaging Science Subsystem images using an automatic procedure: application to Enceladus images 2013-2017
Cooper, N. J.; Lainey, V.; Vienne, A. +3 more
We provide new astrometric observations of Enceladus from images taken using the Cassini Imaging Science Subsystem (ISS) Narrow-Angle Camera. Astrometric reduction was performed using a new fully automatic camera repointing technique built within the CAVIAR software package. The new automatic procedure is based on the k-d tree technique and has be…
The hot white dwarf in the peculiar binary nucleus of the planetary nebula EGB 6
Rauch, T.; Werner, K.; Kruk, J. W.
EGB 6 is an extended, faint old planetary nebula (PN) with an enigmatic nucleus. The central star (PG 0950+139) is a hot DAOZ-type white dwarf (WD). An unresolved, compact emission knot was discovered to be located 0.''166 away from the WD and it was shown to be centered around a dust-enshrouded low-luminosity star. It was argued that the dust dis…
Design and performance of Soft Gamma-ray Detector onboard the Hitomi (ASTRO-H) satellite
Enoto, Teruaki; Yamaoka, Kazutaka; Fukazawa, Yasushi +39 more
Hitomi (ASTRO-H) was the sixth Japanese x-ray satellite that carried instruments with exquisite energy resolution of <7 eV and broad energy coverage of 0.3 to 600 keV. The Soft Gamma-ray Detector (SGD) was the Hitomi instrument that observed the highest energy band (60 to 600 keV). The SGD design achieves a low background level by combining act…
The AMBRE project: searching for the closest solar siblings
Recio-Blanco, A.; de Laverny, P.; Kordopatis, G. +7 more
Context. Finding solar siblings, that is, stars that formed in the same cluster as the Sun, will yield information about the conditions at the Sun's birthplace. Finding possible solar siblings is difficult since they are spread widely throughout the Galaxy.
Aims: We search for solar sibling candidates in AMBRE, the very large spectra database…
Dynamical Analysis of Three Distant Trans-Neptunian Objects with Similar Orbits
Smith, M.; Abbott, T. M. C.; Abdalla, F. B. +63 more
This paper reports the discovery and orbital characterization of two extreme trans-Neptunian objects (ETNOs), 2016 QV89 and 2016 QU89, which have orbits that appear similar to that of a previously known object, 2013 UH15. All three ETNOs have semimajor axes a ≈ 172 au and eccentricities e ≈ 0.77. The angular elemen…
Noble gases in micrometeorites from the Transantarctic Mountains
Trieloff, Mario; Baecker, Bastian; Ott, Ulrich +4 more
The bulk of extraterrestrial matter currently accreted by the Earth is in the form of micrometeorites (MMs) and interplanetary dust particles (IDPs), thus they may have collectively made a substantial contribution to the volatile inventory of the Earth and the other terrestrial planets. We have performed a complete noble gas study, accompanied by …
Understanding type Ia supernovae through their U-band spectra
Rubin, D.; Aldering, G.; Barbary, K. +40 more
Context. Observations of type Ia supernovae (SNe Ia) can be used to derive accurate cosmological distances through empirical standardization techniques. Despite this success neither the progenitors of SNe Ia nor the explosion process are fully understood. The U-band region has been less well observed for nearby SNe, due to technical challenges, bu…
Properties of Decaying Plasma Turbulence at Subproton Scales
Servidio, Sergio; Lapenta, Giovanni; Primavera, Leonardo +2 more
We study the properties of plasma turbulence at subproton scales using kinetic electromagnetic three-dimensional simulations with nonidentical initial conditions. Particle-in-cell modeling of the Taylor-Green vortex has been performed, starting from three different magnetic field configurations. All simulations expose very similar energy evolution…
Plasma Interactions with the Space Environment in the Acceleration Region: Indications of CME-trailing Reconnection Regions
Vilas, Faith; Heiles, Carl; Kepley, Amanda A. +6 more
Coronal mass ejections (CMEs) are sources of major geomagnetic disturbances. On 2013 May 10, a CME crossed the signal path between the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft and Earth. Using the MESSENGER signal, characteristics of the density, velocity, and magnetic field properties of the crossing pl…
Occurrence and persistence of magnetic elements in the quiet Sun
Gošić, M.; Bellot Rubio, L.; Giannattasio, F. +3 more
Context. Turbulent convection efficiently transports energy up to the solar photosphere, but its multi-scale nature and dynamic properties are still not fully understood. Several works in the literature have investigated the emergence of patterns of convective and magnetic nature in the quiet Sun at spatial and temporal scales from granular to glo…