Search Publications
The host galaxy of GRB 980425/SN1998bw: a collisional ring galaxy
Le Floc'h, E.; Pian, E.; Bournaud, F. +8 more
We report Giant Metrewave Radio Telescope (GMRT), Very Large Telescope (VLT), and Spitzer Space Telescope observations of ESO 184-G82, the host galaxy of GRB 980425/SN 1998bw, that yield evidence of a companion dwarf galaxy at a projected distance of 13 kpc. The companion, hereafter GALJ193510-524947, is a gas-rich, star-forming galaxy with a star…
A study of cool white dwarfs in the Sloan Digital Sky Survey Data Release 12
Kepler, S. O.; Koester, D.; Ourique, G. +2 more
In this work, we study white dwarfs where 30 000 K > T_{eff} > 5000 K to compare the differences in the cooling of DAs and non-DAs and their formation channels. Our final sample is composed by nearly 13 000 DAs and more than 3 000 non-DAs that are simultaneously in the SDSS DR12 spectroscopic database and in the Gaia survey DR2. We present t…
GIADA microbalance measurements on board Rosetta: submicrometer- to micrometer-sized dust particle flux in the coma of comet 67P/Churyumov-Gerasimenko
Fulle, M.; Della Corte, V.; Rotundi, A. +7 more
Context. From August 2014 to September 2016, Rosetta escorted comet 67P/Churyumov-Gerasimenko (67P) during its journey around the Sun. One of the aims of Rosetta was to characterize cometary activity and the consequent formation of dust flux structures in cometary comae.
Aims: We characterize and quantify the submicrometer- to micrometer-size…
The dust in M31
Dalcanton, J. J.; Griffin, M. J.; Smith, M. W. L. +6 more
We have analysed Herschel observations of M31, using the PPMAP procedure. The resolution of PPMAP images is sufficient (∼ 31 pc on M31) that we can analyse far-IR dust emission on the scale of giant molecular clouds. By comparing PPMAP estimates of the far-IR emission optical depth at 300 µ m (τ_{{300}}), and the near-IR extinction optical d…
A spatio-kinematic model for jets in post-AGB stars
De Marco, O.; Van Winckel, H.; Kamath, D. +1 more
Aims: We aim to determine the geometry, density gradient, and velocity structure of jets in post-asymptotic giant branch (post-AGB) binaries.
Methods: Our high cadence time series of high-resolution optical spectra of jet-creating post-AGB binary systems provide us with a unique tomography of the jet. We determine the spatio-kinematic st…
ACCESS: Ground-based Optical Transmission Spectroscopy of the Hot Jupiter WASP-4b
López-Morales, Mercedes; Jordán, Andrés; Espinoza, Néstor +6 more
We present an optical transmission spectrum of the atmosphere of WASP-4b obtained through observations of four transits with Magellan/IMACS, as part of the Arizona-CfA-Católica-Carnegie Exoplanet Spectroscopy Survey (ACCESS). Using a Bayesian approach to atmospheric retrieval, we find no evidence for scattering or absorption features in our transi…
Peculiar Velocities of Galaxies Just Beyond the Local Group
Anand, Gagandeep S.; Shaya, Edward J.; Tully, R. Brent +2 more
The Milky Way lies in a thin plane, the Local Sheet, a part of a wall bounding the Local Void lying toward the north supergalactic pole. Galaxies with accurate distances both above and below this supergalactic equatorial plane have systematically negative peculiar velocities. The interpretation of this situation is that the Local Void is expanding…
Close Cassini flybys of Saturn's ring moons Pan, Daphnis, Atlas, Pandora, and Epimetheus
Brown, R. H.; Baines, K. H.; Buratti, B. J. +35 more
Saturn's main ring system is associated with a set of small moons that either are embedded within it or interact with the rings to alter their shape and composition. Five close flybys of the moons Pan, Daphnis, Atlas, Pandora, and Epimetheus were performed between December 2016 and April 2017 during the ring-grazing orbits of the Cassini mission. …
A-type stars in the Canada-France Imaging Survey - II. Tracing the height of the disc at large distances with Blue Stragglers
Laporte, Chervin F. P.; McConnachie, Alan W.; Malhan, Khyati +7 more
We present the kinematics of Blue Straggler (BS) stars identified in the Canada-France Imaging Survey (CFIS), covering 4000 deg2 on the sky in the u band. The BSs sample, characterized through CFIS and Pan-STARRS photometry, has been kinematically decomposed into putative halo and disc populations after cross-matching with Gaia astromet…
Metallicity dependence of the Hercules stream in Gaia/RAVE data - explanation by non-closed orbits
Hattori, Kohei; Kumamoto, Jun; Tagawa, Hiromichi +4 more
The origin of the Hercules stream, the most prominent velocity substructure in the Solar neighbour disc stars, is still under debate. Recent accurate measurements of position, velocity, and metallicity provided by Tycho Gaia Astrometric Solution (TGAS) and RAdial Velocity Experiments (RAVE) have revealed that the Hercules stream is most clearly se…