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The pulsating magnetosphere of the extremely slowly rotating magnetic β Cep star ξ1 CMa
Rivinius, Th.; Wade, G. A.; Neiner, C. +4 more
ξ1 CMa is a monoperiodically pulsating, magnetic β Cep star with magnetospheric X-ray emission that, uniquely amongst magnetic stars, is clearly modulated with the star's pulsation period. The rotational period Prot has yet to be identified, with multiple competing claims in the literature. We present an analysis of a large E…
Planck intermediate results. LII. Planet flux densities
Kim, J.; Miville-Deschênes, M. -A.; Boulanger, F. +147 more
Measurements of flux density are described for five planets, Mars, Jupiter, Saturn, Uranus, and Neptune, across the six Planck High Frequency Instrument frequency bands (100-857 GHz) and these are then compared with models and existing data. In our analysis, we have also included estimates of the brightness of Jupiter and Saturn at the three frequ…
Electron heat flux instability
Lazar, M.; Yoon, P. H.; Saeed, Sundas +2 more
The heat flux instability is an electromagnetic mode excited by a relative drift between the protons and two-component core-halo electrons. The most prominent application may be in association with the solar wind where drifting electron velocity distributions are observed. The heat flux instability is somewhat analogous to the electrostatic Bunema…
Precursors of short gamma-ray bursts in the SPI-ACS/INTEGRAL experiment.
Minaev, P. Yu.; Pozanenko, A. S.
We have analyzed the light curves of 519 short gamma-ray bursts (GRBs) detected in the SPI-ACS/INTEGRAL experiment from December 2002 to May 2014 to search for precursors (a possible activity of the GRB source before the beginning of the main episode). Both the light curves of 519 individual events and the averaged light curve of 372 brightest bur…
The Herschel Virgo Cluster Survey. XX. Dust and gas in the foreground Galactic cirrus
Boquien, M.; Bianchi, S.; Fritz, J. +22 more
We study the correlation between far-infrared/submm dust emission and atomic gas column density in order to derive the properties of the high Galactic latitude, low density, Milky Way cirrus in the foreground of the Virgo cluster of galaxies. Dust emission maps from 60 to 850 µm are obtained from observations with the Spectral and Photometri…
Testing predictions of the quantum landscape multiverse 2: the exponential inflationary potential
Di Valentino, Eleonora; Mersini-Houghton, Laura
The 2015 Planck data release tightened the region of the allowed inflationary models. Inflationary models with convex potentials have now been ruled out since they produce a large tensor to scalar ratio. Meanwhile the same data offers interesting hints on possible deviations from the standard picture of CMB perturbations. Here we revisit the predi…
On the Link between the Release of Solar Energetic Particles Measured at Widespread Heliolongitudes and the Properties of the Associated Coronal Shocks
Lario, D.; Kwon, R. -Y.; Riley, P. +1 more
Under the paradigm that the main agents in the acceleration of solar energetic particles (SEPs) are shocks initially driven by coronal mass ejections, we analyze whether the properties of the shocks in the corona inferred from combining extreme-ultraviolet (EUV) and white-light (WL) observations from multiple vantage points together with magnetohy…
Ion composition at comet 67P near perihelion: Rosetta observations and model-based interpretation
Altwegg, K.; Balsiger, H.; Fuselier, S. A. +22 more
We present the ion composition in the coma of comet 67P with newly detected ion species over the 28-37 u mass range, probed by Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA)/Double Focusing Mass Spectrometer (DFMS). In summer 2015, the nucleus reached its highest outgassing rate and ion-neutral reactions started to take place a…
Distribution functions for resonantly trapped orbits in the Galactic disc
Binney, James; Famaey, Benoit; Monari, Giacomo +1 more
The present-day response of a Galactic disc stellar population to a non-axisymmetric perturbation of the potential has previously been computed through perturbation theory within the phase-space coordinates of the unperturbed axisymmetric system. Such an Eulerian linearized treatment, however, leads to singularities at resonances, which prevent qu…
An automatic approach to exclude interlopers from asteroid families
Radović, Viktor; Novaković, Bojan; Carruba, Valerio +1 more
Asteroid families are a valuable source of information to many asteroid-related researches, assuming a reliable list of their members could be obtained. However, as the number of known asteroids increases fast it becomes more and more difficult to obtain a robust list of members of an asteroid family. Here, we are proposing a new approach to deal …