Search Publications
Study of the aluminium content in AGB winds using ALMA. Indications for the presence of gas-phase (Al2O3)n clusters
Waters, L. B. F. M.; Decin, L.; Richards, A. M. S. +8 more
Context. The condensation of inorganic dust grains in the winds of evolved stars is poorly understood. As of today, it is not yet known which molecular clusters form the first dust grains in oxygen-rich (C/O < 1) asymptotic giant branch (AGB) winds. Aluminium oxides and iron-free silicates are often put forward as promising candidates for the f…
Detection of buckminsterfullerene emission in the diffuse interstellar medium
Joblin, C.; Berné, O.; Cox, N. L. J. +1 more
Emission of fullerenes in their infrared vibrational bands has been detected in space near hot stars. The proposed attribution of the diffuse interstellar bands at 9577 and 9632 Å to electronic transitions of the buckminsterfullerene cation (i.e. C60+) was recently supported by new laboratory data, confirming the presence of …
Aperture synthesis imaging of the carbon AGB star R Sculptoris. Detection of a complex structure and a dominating spot on the stellar disk
de Gregorio-Monsalvo, I.; Eriksson, K.; Lindqvist, M. +16 more
Aims: We present near-infrared interferometry of the carbon-rich asymptotic giant branch (AGB) star R Sculptoris (R Scl).
Methods: We employ medium spectral resolution K-band interferometry obtained with the instrument AMBER at the Very Large Telescope Interferometer (VLTI) and H-band low spectral resolution interferometric imaging obser…
3D shape of asteroid (6) Hebe from VLT/SPHERE imaging: Implications for the origin of ordinary H chondrites
Berthier, J.; Carry, B.; Delbo, M. +15 more
Context. The high-angular-resolution capability of the new-generation ground-based adaptive-optics camera SPHERE at ESO VLT allows us to assess, for the very first time, the cratering record of medium-sized (D 100-200 km) asteroids from the ground, opening the prospect of a new era of investigation of the asteroid belt's collisional history.
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A mid-IR interferometric survey with MIDI/VLTI: resolving the second-generation protoplanetary disks around post-AGB binaries
Waters, L. B. F. M.; Debosscher, J.; de Wit, W. -J. +7 more
Aims: We present a mid-IR interferometric survey of the circumstellar environment of a specific class of post-asymptotic giant branch (post-AGB) binaries. For this class the presence of a compact dusty disk has been postulated on the basis of various spatially unresolved measurements. The aim is to determine the angular extent of the N-band e…
Proper motion survey and kinematic analysis of the ρ Ophiuchi embedded cluster
Bouy, H.; Ducourant, C.; Bontemps, S. +7 more
Context. The ρ Ophiuchi molecular complex and in particular the Lynds L1688 dark cloud is unique in its proximity (~130 pc), in its richness in young stars and protostars, and in its youth (0.5 Myr). It is certainly one of the best targets currently accessible from the ground to study the early phases of star-formation. Proper motion analysis is a…
Interferometric evidence for quantum heated particles in the inner region of protoplanetary disks around Herbig stars
Waters, L. B. F. M.; Dominik, C.; Benisty, M. +6 more
Context. To understand the chemical composition of planets, it is important to know the chemical composition of the region where they form in protoplanetary disks. Because of its fundamental role in chemical and biological processes, carbon is a key element to trace.
Aims: We identify the carriers and processes behind the extended near-infrar…
Gas and dust in the star-forming region ρ Oph A. II. The gas in the PDR and in the dense cores
Liseau, R.; Larsson, B.
Context. The evolution of interstellar clouds of gas and dust establishes the prerequisites for star formation. The pathway to the formation of stars can be studied in regions that have formed stars, but which at the same time also display the earliest phases of stellar evolution, i.e. pre-collapse/collapsing cores (Class -1), protostars (Class 0)…
Interstellar medium conditions in z 0.2 Lyman-break analogs
Berta, S.; Magnelli, B.; Lutz, D. +16 more
We present an analysis of far-infrared (FIR) [CII] and [OI] fine structure line and continuum observations obtained with Herschel/PACS, and 12CO(1-0) observations obtained with the IRAM Plateau de Bure Interferometer, of Lyman-break analogs (LBAs) at z 0.2. The principal aim of this work is to determine the typical interstellar medium (…
Mid-infrared interferometric variability of DG Tauri : Implications for the inner-disk structure
Jaffe, W.; Ábrahám, P.; Chen, L. +12 more
Context. DG Tau is a low-mass pre-main sequence star, whose strongly accreting protoplanetary disk exhibits a so-far enigmatic behavior: its mid-infrared thermal emission is strongly time-variable, even turning the 10 µm silicate feature from emission to absorption temporarily.
Aims: We look for the reason for the spectral variability a…