Search Publications
A package for the automated classification of periodic variable stars
Bailer-Jones, Coryn A. L.; Kim, Dae-Won
We present a machine learning package for the classification of periodic variable stars. Our package is intended to be general: it can classify any single band optical light curve comprising at least a few tens of observations covering durations from weeks to years with arbitrary time sampling. We use light curves of periodic variable stars taken …
Tracing outflows in the AGN forbidden region with SINFONI
Piconcelli, E.; Brusa, M.; Mainieri, V. +8 more
Context. Active galactic nucleus (AGN) driven outflows are invoked in numerical simulations to reproduce several observed properties of local galaxies. The z > 1 epoch is of particular interest as it was during this time that the volume averaged star formation and the accretion rate of black holes were at their maximum. Radiatively driven outfl…
Incidence of debris discs around FGK stars in the solar neighbourhood
Heras, A. M.; Fridlund, M.; Krivov, A. V. +16 more
Context. Debris discs are a consequence of the planet formation process and constitute the fingerprints of planetesimal systems. Their counterparts in the solar system are the asteroid and Edgeworth-Kuiper belts.
Aims: The aim of this paper is to provide robust numbers for the incidence of debris discs around FGK stars in the solar neighbourh…
Solar energetic particle access to distant longitudes through turbulent field-line meandering
Laitinen, T.; Dalla, S.; Kopp, A. +2 more
Context. Current solar energetic particle (SEP) propagation models describe the effects of interplanetary plasma turbulence on SEPs as diffusion, using a Fokker-Planck (FP) equation. However, FP models cannot explain the observed fast access of SEPs across the average magnetic field to regions that are widely separated in longitude within the heli…
Size evolution of star-forming galaxies with 2 <z < 4.5 in the VIMOS Ultra-Deep Survey
Maccagni, D.; Giavalisco, M.; Fontana, A. +15 more
Context. The size of a galaxy encapsulates the signature of the different physical processes driving its evolution. The distribution of galaxy sizes in the Universe as a function of cosmic time is therefore a key to understand galaxy evolution.
Aims: We aim to measure the average sizes and size distributions of galaxies as they are assembling…
An observational study of dust nucleation in Mira (o Ceti). I. Variable features of AlO and other Al-bearing species
Menten, K. M.; Müller, H. S. P.; Patel, N. A. +8 more
Context. Dust is efficiently produced by cool giant stars, but the condensation of inorganic dust is poorly understood. Observations of key aluminum bearing molecules around evolved stars has enabled us to investigate the nucleation of alumina (Al2O3) dust in the gas.
Aims: We aim to identify and characterize aluminum be…
A hard X-ray view of the soft excess in AGN
Ricci, Claudio; Paltani, Stéphane; Boissay, Rozenn
An excess of X-ray emission below 1 keV, called soft excess, is detected in a large fraction of Seyfert 1-1.5s. The origin of this feature remains debated, as several models have been suggested to explain it, including warm Comptonization and blurred ionized reflection. In order to constrain the origin of this component, we exploit the different b…
Globules and pillars in Cygnus X. I. Herschel far-infrared imaging of the Cygnus OB2 environment
Hill, T.; White, G. J.; André, Ph. +21 more
The radiative feedback of massive stars on molecular clouds creates pillars, globules and other features at the interface between the H II region and molecular cloud. Optical and near-infrared observations from the ground as well as with the Hubble or Spitzer satellites have revealed numerous examples of such cloud structures. We present here Hers…
Water and carbon dioxide distribution in the 67P/Churyumov-Gerasimenko coma from VIRTIS-M infrared observations
Erard, S.; Crovisier, J.; Piccioni, G. +14 more
Context. Studying the coma environment of comet 67P/Churyumov-Gerasimenko (67P) is one of the primary scientific goals of the VIRTIS experiment on the ESA Rosetta mission.
Aims: The distribution and variability of water vapour and carbon dioxide in the comet's coma are needed to estimate their production rate, abundances in the nucleus, and t…
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…