Search Publications
Gaia Data Release 1. Catalogue validation
Jordi, C.; Luri, X.; Cantat-Gaudin, T. +42 more
Context. Before the publication of the Gaia Catalogue, the contents of the first data release have undergone multiple dedicated validation tests.
Aims: These tests aim to provide in-depth analysis of the Catalogue content in order to detect anomalies and individual problems in specific objects or in overall statistical properties, and either …
On the Existence of the Kolmogorov Inertial Range in the Terrestrial Magnetosheath Turbulence
Sahraoui, F.; Deng, X. H.; Huang, S. Y. +2 more
In the solar wind, power spectral density (PSD) of the magnetic field fluctuations generally follow the so-called Kolmogorov spectrum f -5/3 in the inertial range, where the dynamics is thought to be dominated by nonlinear interactions between counter-propagating incompressible Alfvén wave parquets. These features are thought to be ubiq…
Dust Density Distribution and Imaging Analysis of Different Ice Lines in Protoplanetary Disks
Pinilla, P.; Pohl, A.; Birnstiel, T. +1 more
Recent high angular resolution observations of protoplanetary disks at different wavelengths have revealed several kinds of structures, including multiple bright and dark rings. Embedded planets are the most used explanation for such structures, but there are alternative models capable of shaping the dust in rings as it has been observed. We assum…
The Sloan Lens ACS Survey. XIII. Discovery of 40 New Galaxy-scale Strong Lenses
Treu, Tommaso; Brownstein, Joel R.; Gavazzi, Raphaël +8 more
We present the full sample of 118 galaxy-scale strong-lens candidates in the Sloan Lens ACS (SLACS) Survey for the Masses (S4TM) Survey, which are spectroscopically selected from the final data release of the Sloan Digital Sky Survey. Follow-up Hubble Space Telescope (HST) imaging observations confirm that 40 candidates are definite strong lenses …
Strong XUV irradiation of the Earth-sized exoplanets orbiting the ultracool dwarf TRAPPIST-1
Wheatley, Peter J.; Gillon, Michaël; Louden, Tom +2 more
We present an XMM-Newton X-ray observation of TRAPPIST-1, which is an ultracool dwarf star recently discovered to host three transiting and temperate Earth-sized planets. We find the star is a relatively strong and variable coronal X-ray source with an X-ray luminosity similar to that of the quiet Sun, despite its much lower bolometric luminosity.…
The Canada-France Imaging Survey: First Results from the u-Band Component
Sawicki, Marcin; Mellier, Yannick; Robin, Annie C. +41 more
The Canada-France Imaging Survey (CFIS) will map the northern high Galactic latitude sky in the u-band ("CFIS-u," 10,000 °2) and in the r-band ("CFIS-r," 5000 °2), enabling a host of stand-alone science investigations, and providing some of the ground-based data necessary for photometric redshift determination for the Euclid …
The MUSCLES Treasury Survey. IV. Scaling Relations for Ultraviolet, Ca II K, and Energetic Particle Fluxes from M Dwarfs
Loyd, R. O. Parke; Hawley, Suzanne L.; Redfield, Seth +18 more
Characterizing the UV spectral energy distribution (SED) of an exoplanet host star is critically important for assessing its planet’s potential habitability, particularly for M dwarfs, as they are prime targets for current and near-term exoplanet characterization efforts and atmospheric models predict that their UV radiation can produce photochemi…
X-rays across the galaxy population - I. Tracing the main sequence of star formation
Georgakakis, A.; Aird, J.; Coil, A. L.
We use deep Chandra imaging to measure the distribution of X-ray luminosities (LX) for samples of star-forming galaxies as a function of stellar mass and redshift, using a Bayesian method to push below the nominal X-ray detection limits. Our luminosity distributions all show narrow peaks at LX ≲ 1042 erg s-1
Gaia Data Release 1. Testing parallaxes with local Cepheids and RR Lyrae stars
Prusti, T.; Zucker, S.; Hatzidimitriou, D. +583 more
Context. Parallaxes for 331 classical Cepheids, 31 Type II Cepheids, and 364 RR Lyrae stars in common between Gaia and the HIPPARCOS and Tycho-2 catalogues are published in Gaia Data Release 1 (DR1) as part of the Tycho-Gaia Astrometric Solution (TGAS).
Aims: In order to test these first parallax measurements of the primary standard candles o…
Analogues of primeval galaxies two billion years after the Big Bang
Castellano, Marco; Fontana, Adriano; Giavalisco, Mauro +30 more
Deep observations are revealing a growing number of young galaxies in the first billion years of cosmic time1. Compared to typical galaxies at later times, they show more extreme emission-line properties2, higher star formation rates3, lower masses4, and smaller sizes5. However, their faintnes…