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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…
Modeling ionized gas in low-metallicity environments: the Local Group dwarf galaxy IC 10
Lebouteiller, V.; Madden, S. C.; Galliano, F. +9 more
Context. Star formation activity is an important driver of galaxy evolution and is influenced by the physical properties of the interstellar medium. Dwarf galaxies allow us to understand how the propagation of radiation and the physical conditions of the different ISM phases are affected by the low-metallicity environment.
Aims: Our objective…
Terrestrial ion escape and relevant circulation in space
Yamauchi, Masatoshi
Observations of the terrestrial ion escape to space and the transport of escaping ions in the magnetosphere are reviewed, with the main stress on subjects that were not covered in reviews over past 2 decades, during which Cluster has significantly improved our knowledge of them. Here, outflowing ions from the ionosphere are classified in terms of …
Collimated radiation in SS 433. Constraints from spatially resolved optical jets and Cloudy modeling of the optical bullets
Dexter, Jason; Waisberg, Idel; Dubus, Guillaume +2 more
Context. The microquasar SS 433 is well known for its precessing, relativistic, and highly collimated baryonic jets, which manifest in its optical spectrum as pairs of hydrogen and helium emission lines moving with large Doppler shifts. Depending on their heating mechanism, the optical jet bullets may serve as a probe of the collimated radiation c…
Young stellar populations in early-type dwarf galaxies. Occurrence, radial extent, and scaling relations
Peletier, R. F.; Valentijn, E. A.; Hamraz, E. +3 more
Aims: To understand the stellar population content of early-type dwarf galaxies (dEs) and their environmental dependence, we compare the slopes and intrinsic scatter of color-magnitude relations (CMRs) for three nearby clusters, Fornax, Virgo, and Coma. Additionally, we present and compare internal color profiles of these galaxies to identify…
Spin Parity of Spiral Galaxies. I. Corroborative Evidence for Trailing Spirals
Tadaki, Ken-ichi; Iye, Masanori; Fukumoto, Hideya
Whether the spiral structure of galaxies is trailing or leading has been a subject of debate. We present a new spin parity catalog of 146 spiral galaxies that lists the following three pieces of information: whether the spiral structure observed on the sky is S-wise or Z-wise; which side of the minor axis of the galaxy is darker and redder, based …