Search Publications
Variability in the CoRoT photometry of three hot O-type stars. HD 46223, HD 46150, and HD 46966
Auvergne, M.; Gosset, E.; Baudin, F. +15 more
Context. The detection of pulsational frequencies in stellar photometry is required as input for asteroseismological modelling. The second short run (SRa02) of the CoRoT mission has provided photometric data of unprecedented quality and time-coverage for a number of O-type stars.
Aims: We analyse the CoRoT data corresponding to three hot O-ty…
The star cluster - field star connection in nearby spiral galaxies. II. Field star and cluster formation histories and their relation
Larsen, S. S.; Silva-Villa, E.
Context. Recent studies have started to cast doubt on the assumption that most stars are formed in clusters. Observational studies of field stars and star cluster systems in nearby galaxies can lead to better constraints on the fraction of stars forming in clusters. Ultimately this may lead to a better understanding of star formation in galaxies, …
High-frequency predictions for number counts and spectral properties of extragalactic radio sources. New evidence of a break at mm wavelengths in spectra of bright blazar sources
de Zotti, G.; Martínez-González, E.; Toffolatti, L. +1 more
We present models to predict high-frequency counts of extragalactic radio sources using physically grounded recipes to describe the complex spectral behaviour of blazars that dominate the mm-wave counts at bright flux densities. We show that simple power-law spectra are ruled out by high-frequency (ν ≥ 100 GHz) data. These data also strongly const…
Transiting exoplanets from the CoRoT space mission. XV. CoRoT-15b: a brown-dwarf transiting companion
Mazeh, T.; Aigrain, S.; Alonso, R. +46 more
We report the discovery by the CoRoT space mission of a transiting brown dwarf orbiting a F7V star with an orbital period of 3.06 days. CoRoT-15b has a radius of 1.12+0.30-0.15 {R}_Jup and a mass of 63.3 ± 4.1 {M}_Jup, and is thus the second transiting companion lying in the theoretical mass domain of brown dwarfs. CoRoT-15b …
Kinematic signature of an intermediate-mass black hole in the globular cluster NGC 6388
Kissler-Patig, M.; de Zeeuw, P. T.; Lützgendorf, N. +4 more
Context. Intermediate-mass black holes (IMBHs) are of interest in a wide range of astrophysical fields. In particular, the possibility of finding them at the centers of globular clusters has recently drawn attention. IMBHs became detectable since the quality of observational data sets, particularly those obtained with HST and with high resolution …
Accurate p-mode measurements of the G0V metal-rich CoRoT target HD 52265
Auvergne, M.; Baudin, F.; García, R. A. +27 more
Context. The star
Planck early results. XXII. The submillimetre properties of a sample of Galactic cold clumps
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +201 more
We perform a detailed investigation of sources from the Cold Cores Catalogue of Planck Objects (C3PO). Our goal is to probe the reliability of the detections, validate the separation between warm and cold dust emission components, provide the first glimpse at the nature, internal morphology and physical characterictics of the Planck-detected sourc…
Hubble flow around Fornax cluster of galaxies
Karachentsev, I. D.; de Freitas Pacheco, J. A.; Nasonova, O. G.
Aims: This work aims to provide a new mass estimate for the Fornax cluster and the Fornax-Eridanus complex, avoiding methods like the virial or fits of the X-ray emission profile, which assume that the system is in equilibrium. This is probably not the case for Fornax, because it is still in process of formation.
Methods: Our mass estima…
Planck early results. II. The thermal performance of Planck
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +229 more
The performance of the Planck instruments in space is enabled by their low operating temperatures, 20 K for LFI and 0.1 K for HFI, achieved through a combination of passive radiative cooling and three active mechanical coolers. The scientific requirement for very broad frequency coverage led to two detector technologies with widely different tempe…
Mass constraints on substellar companion candidates from the re-reduced Hipparcos intermediate astrometric data: nine confirmed planets and two confirmed brown dwarfs
Quirrenbach, A.; Reffert, S.
Context. The recently completed re-reduction of the Hipparcos data by van Leeuwen (2007a, Astrophysics and Space Science Library, 350) makes it possible to search for the astrometric signatures of planets and brown dwarfs known from radial velocity surveys in the improved Hipparcos intermediate astrometric data.
Aims: Our aim is to put more s…