Search Publications
The XMM-Newton serendipitous survey. IX. The fourth XMM-Newton serendipitous source catalogue
Motch, C.; Page, M. J.; Ballet, J. +28 more
Context. Sky surveys produce enormous quantities of data on extensive regions of the sky. The easiest way to access this information is through catalogues of standardised data products. XMM-Newton has been surveying the sky in the X-ray, ultra-violet, and optical bands for 20 years.
Aims: The XMM-Newton Survey Science Centre has been producin…
MIRACLES: atmospheric characterization of directly imaged planets and substellar companions at 4-5 µm. I. Photometric analysis of β Pic b, HIP 65426 b, PZ Tel B, and HD 206893 B
Quanz, S. P.; Todorov, K. O.; Stolker, T. +6 more
Context. Directly imaged planets and substellar companions are key targets for the characterization of self-luminous atmospheres. Their photometric appearance at 4-5 µm is sensitive to the chemical composition and cloud content of their atmosphere.
Aims: We aim to systematically characterize the atmospheres of directly imaged low-mass c…
ISPY-NACO Imaging Survey for Planets around Young stars. Survey description and results from the first 2.5 years of observations
Queloz, D.; Quanz, S. P.; Avenhaus, H. +21 more
Context. The occurrence rate of long-period (a ≳ 50 au) giant planets around young stars is highly uncertain since it is not only governed by the protoplanetary disc structure and planet formation process, but also reflects both dynamical re-structuring processes after planet formation as well as possible capture of planets not formed in situ. Dir…
Time-resolved photometry of the young dipper RX J1604.3-2130A. Unveiling the structure and mass transport through the innermost disk
Bouvier, J.; Manara, C. F.; Pinilla, P. +3 more
Context. RX J1604.3-2130A is a young, dipper-type, variable star in the Upper Scorpius association, suspected to have an inclined inner disk, with respect to its face-on outer disk.
Aims: We aim to study the eclipses to constrain the inner disk properties.
Methods: We used time-resolved photometry from the Rapid Eye Mount telescope and K…
Optical and near-infrared observations of the Fried Egg Nebula. Multiple shell ejections on a 100 yr timescale from a massive yellow hypergiant
Millour, F.; de Wit, W. -J.; Szczerba, R. +15 more
Context. The fate of a massive star during the latest stages of its evolution is highly dependent on its mass-loss rate and geometry and therefore knowing the geometry of the circumstellar material close to the star and its surroundings is crucial.
Aims: We aim to provide insight into the nature (i.e. geometry, rates) of mass-loss episodes, a…
Analysing the spectral energy distributions of Galactic classical Cepheids
Groenewegen, M. A. T.
Spectral energy distributions (SEDs) were constructed for a sample of 477 classical Cepheids (CCs); including stars that have been classified in the literature as such but are probably not. The SEDs were fitted with a dust radiative transfer code. Four stars showed a large mid- or far-infrared excess and the fitting then included a dust component.…
The VMC Survey. XXXVII. Pulsation periods of dust-enshrouded AGB stars in the Magellanic Clouds
van Loon, J. Th.; Ripepi, V.; Marconi, M. +9 more
Context. Variability is a key property of stars on the asymptotic giant branch (AGB). Their pulsation period is related to the luminosity and mass-loss rate of the star. Long-period variables (LPVs) and Mira variables are the most prominent of all types of variability of evolved stars. The reddest, most obscured AGB stars are too faint in the opti…
The Lyman Alpha Reference Sample. XI. Efficient turbulence-driven Lyα escape and an analysis of IR, CO, and [C II]158 µm
Östlin, G.; Hayes, M.; Kunth, D. +8 more
Context. Lyman-α (Lyα) is the brightest emission line in star-forming galaxies. However, its interpretation in terms of physical properties is hampered by the resonant nature of Lyα photons. In order to remedy this complicated situation, the Lyman Alpha Reference Sample (LARS) was defined, enabling the study of Lyα production and escape mechanisms…
Li-rich K giants, dust excess, and binarity
Jorissen, A.; Pourbaix, D.; Escorza, A. +3 more
The origin of the Li-rich K giants is still highly debated. Here, we investigate the incidence of binarity among this family from a nine-year radial-velocity monitoring of a sample of 11 Li-rich K giants using the HERMES spectrograph attached to the 1.2 m Mercator Telescope. A sample of 13 non-Li-rich giants (8 of them being surrounded by dust acc…
Thermal properties of large main-belt asteroids observed by Herschel PACS
Marton, G.; Müller, T. G.; Kiss, C. +11 more
Non-resolved thermal infrared observations enable studies of thermal and physical properties of asteroids via thermo-physical models provided the shape and rotational properties of the target are well determined. We used calibration-programme Herschel PACS data (70, 100, 160 µm) and state-of-the-art shape models derived from adaptive-optics …