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Evolutionary status of isolated B[e] stars
Liu, Sheng-Yuan; Chen, Wen-Ping; Lee, Chien-De
Aims: We study a sample of eight B[e] stars with uncertain evolutionary status to shed light on the origin of their circumstellar dust.
Methods: We performed a diagnostic analysis on the spectral energy distribution beyond infrared wavelengths, and conducted a census of neighboring region of each target to ascertain its evolutionary stat…
Suprathermal electron penetration into the inner magnetosphere of Saturn
Lewis, G. R.; Coates, A. J.; Thomsen, M. F. +3 more
For most Cassini passes through the inner magnetosphere of Saturn, the hot electron population (> few hundred eVs) largely disappears inside of some cutoff L shell. Anode-and-actuation-angle averages of hot electron fluxes observed by the Cassini Electron Spectrometer are binned into 0.1 Rs bins in dipole L to explore the properties …
Dark matter fraction of low-mass cluster members probed by galaxy-scale strong lensing
Grillo, C.; Balestra, I.; Rosati, P. +8 more
We present a strong lensing system, composed of four multiple images of a source at z = 2.387, created by two lens galaxies, G1 and G2, belonging to the galaxy cluster MACS J1115.9+0129 at z = 0.353. We use observations taken as part of the Cluster Lensing and Supernova survey with Hubble, and its spectroscopic follow-up programme at the Very Larg…
Planning and implementation of the on-comet operations of the instrument SD2 onboard the lander Philae of Rosetta mission
Mottola, S.; Remetean, E.; Dolives, B. +4 more
The lander Philae of the Rosetta mission landed on the surface of the comet 67 P/Churyumov-Gerasimenko on November 12, 2014. Among the specific subsystems and instruments carried on Philae, the sampling, drilling and distribution (SD2) subsystem had the role of providing in-situ operations devoted to soil drilling, sample collection, and their dis…
Cellinoid shape model for Hipparcos data
Ip, Wing-Huen; Cellino, Alberto; Hestroffer, Daniel +1 more
Being intermediate between a regular triaxial ellipsoid shape and a more complex convex shape, the so-called "cellinoid" shape model consists of eight octants of eight ellipsoids with the constraint that neighbouring octants share two common axes. The resulting variety of possible shapes, obtained at the cost of only three extra parameters to be a…
Where and when does reconnection occur in the tail?
McPherron, Robert L.
We comment on the question of when and where reconnection begins in the tail and how it is related to the onset of auroral expansion. This question was addressed in a workshop dedicated to Unsolved Problems in Magnetospheric Physics held in Scarborough, UK, in September 2015. The answer is that it typically occurs first in the midtail a little bey…
Herschel observations of the nebula M1-67 around the Wolf-Rayet star WR 124
Barlow, M. J.; Groenewegen, M. A. T.; Waelkens, C. +3 more
Infrared Herschel imaging and spectroscopic observations of the nebula M1-67 around the Wolf-Rayet star WR 124 have been obtained along with optical imaging observations. The infrared images reveal a clumpy dusty nebula that extends up to 1 pc. The comparison with the optical images shows that the ionized gas nebula coincides with the dust nebula,…
Of Genes and Machines: Application of a Combination of Machine Learning Tools to Astronomy Data Sets
Kumar, S.; Chambers, K. C.; Flewelling, H. +8 more
We apply a combination of genetic algorithm (GA) and support vector machine (SVM) machine learning algorithms to solve two important problems faced by the astronomical community: star-galaxy separation and photometric redshift estimation of galaxies in survey catalogs. We use the GA to select the relevant features in the first step, followed by op…
The circumstellar disc of FS Tau B - a self-consistent model based on observations in the mid-infrared with NACO
Kirchschlager, Florian; Wolf, Sebastian; Madlener, David
Protoplanetary discs are a byproduct of the star formation process. In the dense mid-plane of these discs, planetesimals and planets are expected to form. The first step in planet formation is the growth of dust particles from submicrometre-sized grains to macroscopic mm-sized aggregates. The grain growth is accompanied by radial drift and vertica…
A photochemical model of the dust-loaded ionosphere of Mars
Montmessin, F.; O'Brien, K.; Michael, M. +5 more
The ionization of the lower Martian atmosphere and the presence of charged species are fundamental in the understanding of atmospheric electricity phenomena, such as electric discharges, large-scale electric currents, and Schumann resonances. The present photochemical model of the lower ionosphere of Mars (0-70 km) is developed to compute the conc…