Search Publications
Multi-wavelength campaign on NGC 7469. V. Analysis of the HST/COS observations: Super solar metallicity, distance, and trough variation models
Kaastra, J. S.; Kriss, G. A.; Arav, N. +18 more
Context. AGN outflows are thought to influence the evolution of their host galaxies and their super massive black holes. To better understand these outflows, we executed a deep multiwavelength campaign on NGC 7469. The resulting data, combined with those of earlier epochs, allowed us to construct a comprehensive physical, spatial, and temporal pic…
CS Cha B: A disc-obscured M-type star mimicking a polarised planetary companion
Snellen, I. A. G.; Ginski, C.; Girard, J. +6 more
Context. Direct imaging provides a steady flow of newly discovered giant planets and brown dwarf companions. These multi-object systems can provide information about the formation of low-mass companions in wide orbits and/or help us to speculate about possible migration scenarios. Accurate classification of companions is crucial for testing format…
APEX observations of ortho-H2D+ towards dense cores in the Orion B9 filament
Miettinen, O.
Context. Initial conditions and very early stages of star formation can be probed through spectroscopic observations of deuterated molecular species
Aims: We aim to determine the ortho-H2D+ properties (e.g. column density and fractional abundance with respect to H2) in a sample of dense cores in the Orion B9 s…
Gaia18aen: First symbiotic star discovered by Gaia
Reichart, D. E.; Skowron, J.; Gromadzki, M. +20 more
Context. Besides the astrometric mission of the Gaia satellite, its repeated and high-precision measurements also serve as an all-sky photometric transient survey. The sudden brightenings of the sources are published as Gaia Photometric Science Alerts and are made publicly available, allowing the community to photometrically and spectroscopically …
VLT/X-shooter spectroscopy of massive young stellar objects in the 30 Doradus region of the Large Magellanic Cloud
Kaper, L.; Sabbi, E.; de Mink, S. E. +13 more
The process of massive star (M ≥ 8 M⊙) formation is still poorly understood. Observations of massive young stellar objects (MYSOs) are challenging due to their rarity, short formation timescale, large distances, and high circumstellar extinction. Here, we present the results of a spectroscopic analysis of a population of MYSOs in the La…
Cold gas and dust: Hunting spiral-like structures in early-type galaxies
Duc, P. -A.; Peletier, R. F.; Serra, P. +1 more
Context. Observations of neutral hydrogen (H I) and molecular gas show that 50% of all nearby early-type galaxies contain some cold gas. Molecular gas is always found in small gas discs in the central region of the galaxy, while neutral hydrogen is often distributed in a low-column density disc or ring typically extending well beyond the stellar b…
FEDReD. I. 3D extinction and stellar maps by Bayesian deconvolution
Arenou, F.; Babusiaux, C.; Hottier, C. +2 more
Context. While Gaia enables us to probe the extended local neighbourhood in great detail, the thin disc structure at larger distances remains sparsely explored.
Aims: We aim here to build a non-parametric 3D model of the thin disc structures handling both the extinction and the stellar density simultaneously.
Methods: We developed a Baye…
Impact of a companion and of chromospheric emission on the shape of chromosome maps for globular clusters
Martins, F.; Lardo, C.; Morin, J. +2 more
Context. Globular clusters (GCs) host multiple populations of stars that are well-separated in a photometric diagram - the chromosome map - built from specific Hubble Space Telescope (HST) filters. Stars from different populations feature at various locations on this diagram due to peculiar chemical compositions. Stars of the first population, wit…
The GAPS programme at TNG. XXIV. An eccentric Neptune-mass planet near the inner edge of the BD-11 4672 habitable zone
Scandariato, G.; Pagano, I.; Poretti, E. +34 more
Context. With the growth of comparative exoplanetology, it is becoming increasingly clear that investigating the relationships between inner and outer planets plays a key role in discriminating between competing formation and evolution models. To do so, it is important to probe the inner region of systems that host long-period giants in search of …
The GALEX Ultraviolet Virgo Cluster Survey (GUViCS). VIII. Diffuse dust in the Virgo intra-cluster space
Andreani, P.; Bianchi, S.; Boselli, A. +5 more
Aims: We present the first detection of diffuse dust in the intra-cluster medium of the Virgo cluster out to ∼0.4 virial radii, and study the radial variation of its properties on a radial scale of the virial radius.
Methods: Analysing near-UV - i colours for a sample of ∼12 000 background galaxies with redshifts 0.02 < z < 0.8, we…