Search Publications
Spectro-astrometry of the pre-transitional star LkCa 15 does not reveal an accreting planet but extended Hα emission
Mendigutía, I.; Huélamo, N.; Baines, D. +4 more
Context. The detection of forming planets in protoplanetary disks around young stars remains elusive, and state-of-the-art observational techniques provide somewhat ambiguous results. The pre-transitional T Tauri star LkCa 15 is an excellent example. It has been reported that it could host three planets; candidate planet b is in the process of for…
Discovery of a brown dwarf companion to the star HIP 64892
Rouan, D.; Henning, T.; Fantinel, D. +89 more
We report the discovery of a bright, brown dwarf companion to the star HIP 64892, imaged with VLT/SPHERE during the SHINE exoplanet survey. The host is a B9.5V member of the Lower-Centaurus-Crux subgroup of the Scorpius Centaurus OB association. The measured angular separation of the companion (1.2705 ± 0.0023") corresponds to a projected distance…
A spectroscopic survey of the youngest field stars in the solar neighborhood . II. The optically faint sample
Montes, D.; Gandolfi, D.; Guillout, P. +5 more
Context. Star formation in the solar neighborhood is mainly traced by young stars in open clusters, associations, and in the field, which can be identified, for example, by their X-ray emission. The determination of stellar parameters for the optical counterparts of X-ray sources is crucial for a full characterization of these stars.
Aims: Th…
XMMPZCAT: A catalogue of photometric redshifts for X-ray sources
Georgantopoulos, I.; Mountrichas, G.; Corral, A. +1 more
Aims: The third version of the XMM-Newton serendipitous catalogue (3XMM), containing almost half million sources, is now the largest X-ray catalogue. However, its full scientific potential remains untapped due to the lack of distance information (i.e. redshifts) for the majority of its sources. Here we present XMMPZCAT, a catalogue of photome…
The AMBRE Project: r-process elements in the Milky Way thin and thick discs
Recio-Blanco, A.; de Laverny, P.; Guiglion, G. +1 more
Context. The chemical evolution of neutron capture elements in the Milky Way disc is still a matter of debate. There is a lack of statistically significant catalogues of such element abundances, especially those of the r-process.
Aims: We aim to understand the chemical evolution of r-process elements in Milky Way disc. We focus on three pure …
The co-existence of hot and cold gas in debris discs
Carmona, A.; Eiroa, C.; Montesinos, B. +19 more
Context. Debris discs have often been described as gas-poor discs as the gas-to-dust ratio is expected to be considerably lower than in primordial, protoplanetary discs. However, recent observations have confirmed the presence of a non-negligible amount of cold gas in the circumstellar (CS) debris discs around young main-sequence stars. This cold …
Clustering the Orion B giant molecular cloud based on its molecular emission
Peretto, Nicolas; Pety, Jérôme; Öberg, Karin +12 more
Context. Previous attempts at segmenting molecular line maps of molecular clouds have focused on using position-position-velocity data cubes of a single molecular line to separate the spatial components of the cloud. In contrast, wide field spectral imaging over a large spectral bandwidth in the (sub)mm domain now allows one to combine multiple mo…
A multi-instrument non-parametric reconstruction of the electron pressure profile in the galaxy cluster CLJ1226.9+3332
Aussel, H.; Adam, R.; Benoît, A. +37 more
Context. In the past decade, sensitive, resolved Sunyaev-Zel'dovich (SZ) studies of galaxy clusters have become common. Whereas many previous SZ studies have parameterized the pressure profiles of galaxy clusters, non-parametric reconstructions will provide insights into the thermodynamic state of the intracluster medium. Aim. We seek to recover t…
A revised estimate of the distance to the clouds in the Chamaeleon complex using the Tycho-Gaia Astrometric Solution
Manara, Carlo F.; Prusti, Timo; Voirin, Jordan
Context. The determination of the distance to dark star-forming clouds is a key parameter to derive the properties of the cloud itself and of its stellar content. This parameter is still loosely constrained even in nearby star-forming regions. Aim. We want to determine the distances to the clouds in the Chamaeleon-Musca complex and explore the con…
ALMA detects a radial disk wind in DG Tauri
Audard, M.; Güdel, M.; Vorobyov, E. +7 more
Aims: We aim to use the high spatial resolution of the Atacama Large Millimeter/submillimeter Array (ALMA) to map the flow pattern of molecular gas near DG Tauri and its disk, a young stellar object driving a jet and a molecular outflow.
Methods: We use observations from ALMA in the J = 2 - 1 transition of 12CO, 13C…