Search Publications
Gaia Data Release 1. Astrometry: one billion positions, two million proper motions and parallaxes
Mora, A.; Jordan, S.; Figueras, F. +80 more
Context. Gaia Data Release 1 (DR1) contains astrometric results for more than 1 billion stars brighter than magnitude 20.7 based on observations collected by the Gaia satellite during the first 14 months of its operational phase.
Aims: We give a brief overview of the astrometric content of the data release and of the model assumptions, data p…
Consistent dust and gas models for protoplanetary disks. I. Disk shape, dust settling, opacities, and PAHs
Waters, L. B. F. M.; Pinte, C.; Ménard, F. +19 more
We propose a set of standard assumptions for the modelling of Class II and III protoplanetary disks, which includes detailed continuum radiative transfer, thermo-chemical modelling of gas and ice, and line radiative transfer from optical to cm wavelengths. The first paper of this series focuses on the assumptions about the shape of the disk, the d…
Extended Lyman α haloes around individual high-redshift galaxies revealed by MUSE
Steinmetz, M.; Carollo, C. M.; Verhamme, A. +22 more
We report the detection of extended Lyα emission around individual star-forming galaxies at redshifts z = 3-6 in an ultradeep exposure of the Hubble Deep Field South obtained with MUSE on the ESO-VLT. The data reach a limiting surface brightness (1σ) of ~1 × 10-19 erg s-1 cm-2 arcsec-2 in azimuthally ave…
The habitability of Proxima Centauri b. I. Irradiation, rotation and volatile inventory from formation to the present
Guinan, Edward F.; Engle, Scott G.; Reiners, Ansgar +9 more
Proxima b is a planet with a minimum mass of 1.3M⊕ orbiting within the habitable zone (HZ) of Proxima Centauri, a very low-mass, active star and the Sun's closest neighbor. Here we investigate a number of factors related to the potential habitability of Proxima b and its ability to maintain liquid water on its surface. We set the stage …
An extreme [O III] emitter at z = 3.2: a low metallicity Lyman continuum source
Giavalisco, M.; Castellano, M.; Pentericci, L. +16 more
Aims: Cosmic reionization is an important process occurring in the early epochs of the Universe. However, because of observational limitations due to the opacity of the intergalactic medium to Lyman continuum photons, the nature of ionizing sources is still not well constrained. While high-redshift star-forming galaxies are thought to be the …
PTF12os and iPTF13bvn. Two stripped-envelope supernovae from low-mass progenitors in NGC 5806
Pian, E.; Sollerman, J.; Gal-Yam, A. +19 more
Context. We investigate two stripped-envelope supernovae (SNe) discovered in the nearby galaxy NGC 5806 by the (intermediate) Palomar Transient Factory [(I)PTF]. These SNe, designated PTF12os/SN 2012P and iPTF13bvn, exploded within ~520 days of one another at a similar distance from the host-galaxy center. We classify PTF12os as a Type IIb SN base…
An evaporating planet in the wind: stellar wind interactions with the radiatively braked exosphere of GJ 436 b
Vidotto, A. A.; Ehrenreich, D.; Lecavelier des Etangs, A. +2 more
Observations of the warm Neptune GJ 436 b were performed with HST/STIS at three different epochs (2012, 2013, 2014) in the stellar Lyman-α line. They showed deep, repeated transits that were attributed to a giant exosphere of neutral hydrogen. The low radiation pressure from the M-dwarf host star was shown to play a major role in the dynamics of t…
CLASH-VLT: A highly precise strong lensing model of the galaxy cluster RXC J2248.7-4431 (Abell S1063) and prospects for cosmography
Zitrin, A.; Grillo, C.; Tozzi, P. +32 more
Aims: We perform a comprehensive study of the total mass distribution of the galaxy cluster RXC J2248.7-4431 (z = 0.348) with a set of high-precision strong lensing models, which take advantage of extensive spectroscopic information on many multiply lensed systems. In the effort to understand and quantify inherent systematics in parametric st…
The Close AGN Reference Survey (CARS). Mrk 1018 returns to the shadows after 30 years as a Seyfert 1
Combes, F.; Scharwächter, J.; Eckart, A. +10 more
We report the discovery that the known "changing look" AGN Mrk 1018 has changed spectral type for a second time. New VLT-MUSE data taken in 2015 as part of the Close AGN Reference Survey (CARS) shows that the AGN has returned to its original Seyfert 1.9 classification. The CARS sample is selected to contain only bright type 1 AGN, but Mrk 1018's b…
The ASTRODEEP Frontier Fields catalogues. II. Photometric redshifts and rest frame properties in Abell-2744 and MACS-J0416
Elbaz, D.; Shu, X.; Ciesla, L. +35 more
Aims: We present the first public release of photometric redshifts, galaxy rest frame properties and associated magnification values in the cluster and parallel pointings of the first two Frontier Fields, Abell-2744 and MACS-J0416. The released catalogues aim to provide a reference for future investigations of extragalactic populations in the…