Search Publications
A self-consistent approach to the hard and soft states of 4U 1705-44
Santangelo, A.; Robba, N. R.; Papitto, A. +10 more
Context. High-resolution spectroscopy has recently revealed in many low-mass X-ray binaries hosting a neutron star that the shape of the broad iron line observed in the 6.4-6.97 keV range is consistently well-fitted by a relativistically smeared line profile.
Aims: The presence of other broad features, besides the iron line, together with a h…
Transiting exoplanets from the CoRoT space mission. IX. CoRoT-6b: a transiting ``hot Jupiter'' planet in an 8.9d orbit around a low-metallicity star
Mazeh, T.; Aigrain, S.; Alapini, A. +45 more
The CoRoT satellite exoplanetary team announces its sixth transiting planet in this paper. We describe and discuss the satellite observations as well as the complementary ground-based observations - photometric and spectroscopic - carried out to assess the planetary nature of the object and determine its specific physical parameters. The discovery…
A double radio halo in the close pair of galaxy clusters Abell 399 and Abell 401
Govoni, F.; Giovannini, G.; Feretti, L. +1 more
Aims: Radio halos are faint radio sources usually located at the center of merging clusters of galaxies. These diffuse radio sources are rare, having so far been found only in about 30 clusters of galaxies, suggesting that particular conditions are needed to form and maintain them. It is interesting to investigate the presence of radio halos …
Constraints on the origin of the massive, hot, and rapidly rotating magnetic white dwarf RE J 0317-853 from an HST parallax measurement
Jordan, S.; Nelan, E.; Bastian, U. +2 more
Aims: We use the parallax measurements of RE J 0317-853 to determine its mass, radius, and cooling age and thereby constrain its evolutionary origins.
Methods: We observed RE J 0317-853 with the Hubble Space Telescope's Fine Guidance Sensor to measure the parallax of RE J 0317-853 and its binary companion, the non-magnetic white dwarf LB…
Non-radial oscillations in the red giant HR 7349 measured by CoRoT
Auvergne, M.; Baudin, F.; Hatzes, A. P. +13 more
Context. Convection in red giant stars excites resonant acoustic waves whose frequencies depend on the sound speed inside the star, which in turn depends on the properties of the stellar interior. Therefore, asteroseismology is the most robust available method for probing the internal structure of red giant stars.
Aims: Solar-like oscillation…
Dynamics of isolated magnetic bright points derived from Hinode/SOT G-band observations
Veronig, A.; Utz, D.; Hanslmeier, A. +3 more
Context. Small-scale magnetic fields in the solar photosphere can be identified in high-resolution magnetograms or in the G-band as magnetic bright points (MBPs). Rapid motions of these fields can cause magneto-hydrodynamical waves and can also lead to nanoflares by magnetic field braiding and twisting. The MBP velocity distribution is a crucial p…
First results from HerMES on the evolution of the submillimetre luminosity function
Altieri, B.; Aussel, H.; Elbaz, D. +81 more
We have carried out two extremely deep surveys with SPIRE, one of the two cameras on Herschel, at 250 µm, close to the peak of the far-infrared background. We have used the results to investigate the evolution of the rest-frame 250-µm luminosity function out to z = 2. We find evidence for strong evolution out to z ≃ 1 but evidence for …
Thermo-dynamic and chemical properties of the intra-cluster medium
Rossetti, M.; Molendi, S.; Leccardi, A.
Aims: We aim to provide constraints on evolutionary scenarios in clusters. One of our main goals is to understand whether, as claimed by some, the cool core/non-cool core division is established once and for all during the early history of a cluster.
Methods: We employ a sample of ≃60 objects to classify clusters according to different p…
Planetary eclipse mapping of CoRoT-2a. Evolution, differential rotation, and spot migration
Schmitt, J. H. M. M.; Czesla, S.; Wolter, U. +1 more
The lightcurve of CoRoT-2 shows substantial rotational modulation and deformations of the planet's transit profiles caused by starspots. We consistently model the entire lightcurve, including both rotational modulation and transits, stretching over approximately 30 stellar rotations and 79 transits. The spot distribution and its evolution on the n…
Nitrogen hydrides in the cold envelope of IRAS 16293-2422
Falgarone, E.; Maret, S.; Henning, T. +58 more
Nitrogen is the fifth most abundant element in the Universe, yet the gas-phase chemistry of N-bearing species remains poorly understood. Nitrogen hydrides are key molecules of nitrogen chemistry. Their abundance ratios place strong constraints on the production pathways and reaction rates of nitrogen-bearing molecules. We observed the class 0 prot…