Search Publications
Gaia Data Release 2. First stellar parameters from Apsis
Fouesneau, Morgan; Kordopatis, Georges; Bailer-Jones, Coryn A. L. +13 more
The second Gaia data release (Gaia DR2) contains, beyond the astrometry, three-band photometry for 1.38 billion sources. One band is the G band, the other two were obtained by integrating the Gaia prism spectra (BP and RP). We have used these three broad photometric bands to infer stellar effective temperatures, Teff, for all sources br…
Gaia Data Release 2. Mapping the Milky Way disc kinematics
Prusti, T.; Mazeh, T.; Zucker, S. +450 more
Context. The second Gaia data release (Gaia DR2) contains high-precision positions, parallaxes, and proper motions for 1.3 billion sources as well as line-of-sight velocities for 7.2 million stars brighter than GRVS = 12 mag. Both samples provide a full sky coverage.
Aims: To illustrate the potential of Gaia DR2, we provide a first…
From thermal dissociation to condensation in the atmospheres of ultra hot Jupiters: WASP-121b in context
Fortney, Jonathan J.; Désert, Jean-Michel; Showman, Adam P. +10 more
Context. A new class of exoplanets has emerged: the ultra hot Jupiters, the hottest close-in gas giants. The majority of them have weaker-than-expected spectral features in the 1.1-1.7 µm bandpass probed by HST/WFC3 but stronger spectral features at longer wavelengths probed by Spitzer. This led previous authors to puzzling conclusions about…
The nature of the TRAPPIST-1 exoplanets
Triaud, Amaury H. M. J.; Burgasser, Adam J.; Gillon, Michaël +23 more
Context. The TRAPPIST-1 system hosts seven Earth-sized, temperate exoplanets orbiting an ultra-cool dwarf star. As such, it represents a remarkable setting to study the formation and evolution of terrestrial planets that formed in the same protoplanetary disk. While the sizes of the TRAPPIST-1 planets are all known to better than 5% precision, the…
Gaia DR2 proper motions of dwarf galaxies within 420 kpc. Orbits, Milky Way mass, tidal influences, planar alignments, and group infall
Fritz, T. K.; Battaglia, G.; Brook, C. +5 more
A proper understanding of the Milky Way (MW) dwarf galaxies in a cosmological context requires knowledge of their 3D velocities and orbits. However, proper motion (PM) measurements have generally been of limited accuracy and are available only for more massive dwarfs. We therefore present a new study of the kinematics of the MW dwarf galaxies. We …
Orbital and atmospheric characterization of the planet within the gap of the PDS 70 transition disk
Rouan, D.; Ménard, F.; Quanz, S. P. +43 more
Context. The observation of planets in their formation stage is a crucial but very challenging step in understanding when, how, and where planets form. PDS 70 is a young pre-main sequence star surrounded by a transition disk, in the gap of which a planetary-mass companion has recently been discovered. This discovery represents the first robust dir…
Near infrared spectroscopy and star-formation histories of 3 ≤ z ≤ 4 quiescent galaxies
Papovich, C.; Glazebrook, K.; Kacprzak, G. G. +8 more
We present Keck-MOSFIRE H and K spectra for a sample of 24 candidate quiescent galaxies at 3 < z < 4, identified from their rest-frame UVJ colors and photometric redshifts in the ZFOURGE and 3DHST surveys. With median integration times of one hour in H and five in K, we obtain spectroscopic redshifts for half of the sample, using either Balm…
GOODS-ALMA: 1.1 mm galaxy survey. I. Source catalog and optically dark galaxies
Magnelli, B.; Daddi, E.; Elbaz, D. +36 more
Aims: We present a 69 arcmin2 ALMA survey at 1.1 mm, GOODS-ALMA, matching the deepest HST-WFC3 H-band part of the GOODS-South field.
Methods: We tapered the 0″24 original image with a homogeneous and circular synthesized beam of 0″60 to reduce the number of independent beams - thus reducing the number of purely statistical spu…
Gaia Data Release 2. Gaia Radial Velocity Spectrometer
Prusti, T.; Smith, M.; Gosset, E. +40 more
This paper presents the specification, design, and development of the Radial Velocity Spectrometer (RVS) on the European Space Agency's Gaia mission. Starting with the rationale for the full six dimensions of phase space in the dynamical modelling of the Galaxy, the scientific goals and derived top-level instrument requirements are discussed, lead…
Dust temperature and mid-to-total infrared color distributions for star-forming galaxies at 0 < z < 4
Elbaz, D.; Franco, M.; Ciesla, L. +3 more
We present a new, publicly available library of dust spectral energy distributions (SEDs). These SEDs are characterized by only three parameters: the dust mass (Mdust), the dust temperature (Tdust), and the mid-to-total infrared color (IR8 ≡ LIR/L8). The latter measures the relative contribution of polyc…