Search Publications
Extended stellar systems in the solar neighborhood. I. The tidal tails of the Hyades
Meingast, Stefan; Alves, João
We report the discovery of two well-defined tidal tails emerging from the Hyades star cluster. The tails were detected in Gaia DR2 data by selecting cluster members in the 3D galactocentric cylindrical velocity space. The robustness of our member selection is reinforced by the fact that the sources depict an almost noiseless, coeval stellar main s…
Signatures of the resonances of a large Galactic bar in local velocity space
Monari, G.; Siebert, A.; Famaey, B. +2 more
The second data release of the Gaia mission has revealed a very rich structure in local velocity space. In terms of in-plane motions, this rich structure is also seen as multiple ridges in the actions of the axisymmetric background potential of the Galaxy. These ridges are probably related to a combination of effects from ongoing phase-mixing and …
The Herschel Dwarf Galaxy Survey. II. Physical conditions, origin of [C II] emission, and porosity of the multiphase low-metallicity ISM
Lebouteiller, V.; Madden, S. C.; Galliano, F. +7 more
The sensitive infrared telescopes, Spitzer and Herschel, have been used to target low-metallicity star-forming galaxies, allowing us to investigate the properties of their interstellar medium (ISM) in unprecedented detail. Interpretation of the observations in physical terms relies on careful modeling of those properties. We have employed a multip…
The ultra-diffuse galaxy NGC 1052-DF2 with MUSE. I. Kinematics of the stellar body
Emsellem, Eric; Müller, Oliver; Lelli, Federico +14 more
The so-called ultra-diffuse galaxy NGC 1052-DF2 was announced to be a galaxy lacking dark matter based on a spectroscopic study of its constituent globular clusters. Here we present the first spectroscopic analysis of the stellar body of this galaxy using the MUSE integral-field spectrograph at the (ESO) Very Large Telescope. The MUSE datacube sim…
Observational constraints on dust disk sizes in tidally truncated protoplanetary disks in multiple systems in the Taurus region
Liu, Y.; Lodato, G.; van der Plas, G. +16 more
The impact of stellar multiplicity on the evolution of planet-forming disks is still the subject of debate. Here we present and analyze disk structures around ten multiple stellar systems that were included in an unbiased, high spatial resolution survey performed with ALMA of 32 protoplanetary disks in the Taurus star-forming region. At the unprec…
Dynamics of cluster-forming hub-filament systems. The case of the high-mass star-forming complex Monoceros R2
Schneider, N.; Tremblin, P.; Didelon, P. +15 more
Context. High-mass stars and star clusters commonly form within hub-filament systems. Monoceros R2 (hereafter Mon R2), at a distance of 830 pc, harbors one of the closest of these systems, making it an excellent target for case studies.
Aims: We investigate the morphology, stability and dynamical properties of the Mon R2 hub-filament system. …
Comprehensive comparison of models for spectral energy distributions from 0.1 µm to 1 mm of nearby star-forming galaxies
Helou, G.; Ciesla, L.; Boquien, M. +26 more
We have fit the far-ultraviolet (FUV) to sub-millimeter (850 µm) spectral energy distributions (SEDs) of the 61 galaxies from the Key Insights on Nearby Galaxies: A Far-Infrared Survey with Herschel (KINGFISH). The fitting has been performed using three models: the Code for Investigating GALaxy Evolution (CIGALE), the GRAphite-SILicate appro…
ALMA survey of Class II protoplanetary disks in Corona Australis: a young region with low disk masses
Tamura, M.; Galván-Madrid, R.; Testi, L. +20 more
Context. In recent years, the disk populations in a number of young star-forming regions have been surveyed with the Atacama Large Millimeter/submillimeter Array (ALMA). Understanding the disk properties and their correlation with the properties of the central star is critical to understanding planet formation. In particular, a decrease of the ave…
Gas phase Elemental abundances in Molecular cloudS (GEMS). I. The prototypical dark cloud TMC 1
Roueff, E.; Kirk, J.; Ward-Thompson, D. +30 more
GEMS is an IRAM 30 m Large Program whose aim is determining the elemental depletions and the ionization fraction in a set of prototypical star-forming regions. This paper presents the first results from the prototypical dark cloud Taurus molecular cloud (TMC) 1. Extensive millimeter observations have been carried out with the IRAM 30 m telescope (…
Climate of an ultra hot Jupiter. Spectroscopic phase curve of WASP-18b with HST/WFC3
Fortney, Jonathan J.; Stevenson, Kevin B.; Désert, Jean-Michel +6 more
We present the analysis of a full-orbit, spectroscopic phase curve of the ultra hot Jupiter (UHJ) WASP-18b, obtained with the Wide Field Camera 3 aboard the Hubble Space Telescope. We measured the normalised day-night contrast of the planet as >0.96 in luminosity: the disc-integrated dayside emission from the planet is at 964 ± 25 ppm, correspo…