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The GALAH survey: multiple stars and our Galaxy. I. A comprehensive method for deriving properties of FGK binary stars
Munari, U.; Wittenmyer, R. A.; Stello, D. +24 more
Context. Binary stellar systems form a large fraction of the Galaxy's stars. They are useful as laboratories for studying the physical processes taking place within stars, and must be correctly taken into account when observations of stars are used to study the structure and evolution of the Galaxy. The advent of large-scale spectroscopic and phot…
Ghostly galaxies as solitons of Bose-Einstein dark matter
Broadhurst, Tom; Smoot, George F.; De Martino, Ivan +2 more
The large dark cores of common dwarf galaxies are unexplained by the standard heavy particle interpretation of dark matter. This puzzle is exacerbated by the discovery of a very large but barely visible, dark matter dominated galaxy Antlia II orbiting the Milky Way, uncovered by tracking star motions with the Ĝaia satellite. Although Antlia II has…
The Strength of the Dynamical Spiral Perturbation in the Galactic Disk
Hogg, David W.; Rix, Hans-Walter; Buck, Tobias +4 more
The mean Galactocentric radial velocities $\langle {v}_{R}\rangle (R,\varphi )$ of luminous red giant stars within the midplane of the Milky Way reveal a spiral signature, which could plausibly reflect the response to a nonaxisymmetric perturbation of the gravitational potential in the Galactic disk. We apply a simple steady-state toy model of a l…
ICME Evolution in the Inner Heliosphere
Luhmann, J. G.; Jian, L. K.; Gopalswamy, N. +1 more
ICMEs (interplanetary coronal mass ejections), the heliospheric counterparts of what is observed with coronagraphs at the Sun as CMEs, have been the subject of intense interest since their close association with geomagnetic storms was established in the 1980s. These major interplanetary plasma and magnetic field transients, often preceded and acco…
The ASAS-SN catalogue of variable stars VI: an all-sky sample of δ Scuti stars
Kochanek, C. S.; Stanek, K. Z.; Thompson, Todd A. +10 more
We characterize an all-sky catalogue of ∼8400 δ Scuti variables in ASAS-SN, which includes ∼3300 new discoveries. Using distances from Gaia DR2, we derive period-luminosity relationships for both the fundamental mode and overtone pulsators in the WJK, V, Gaia DR2 G, J, H, Ks, and W1 bands. We find that the overtone…
Two Intermediate-mass Transiting Brown Dwarfs from the TESS Mission
Henning, Thomas; Hellier, Coel; Latham, David W. +28 more
We report the discovery of two intermediate-mass transiting brown dwarfs (BDs), TOI-569b and TOI-1406b, from NASA's Transiting Exoplanet Survey Satellite mission. TOI-569b has an orbital period of P = 6.55604 ± 0.00016 days, a mass of Mb = 64.1 ± 1.9 ${M}_{{\rm{J}}}$ , and a radius of Rb = 0.75 ± 0.02 ${R}_{{\rm{J}}}$ . Its h…
Detailed Abundances in the Ultra-faint Magellanic Satellites Carina II and III
Bechtol, K.; Allam, S.; Gruendl, R. A. +14 more
We present the first detailed elemental abundances in the ultra-faint Magellanic satellite galaxies Carina II (Car II) and Carina III (Car III). With high-resolution Magellan/MIKE spectroscopy, we determined the abundances of nine stars in Car II, including the first abundances of an RR Lyrae star in an ultra-faint dwarf galaxy (UFD), and two star…
Runaway and walkaway stars from the ONC with Gaia DR2
Parker, Richard J.; Schoettler, Christina; de Bruijne, Jos +1 more
Theory predicts that we should find fast, ejected (runaway) stars of all masses around dense, young star-forming regions. N-body simulations show that the number and distribution of these ejected stars could be used to constrain the initial spatial and kinematic substructure of the regions. We search for runaway and slower walkaway stars within 10…
The MOSDEF Survey: Kinematic and Structural Evolution of Star-forming Galaxies at 1.4 ≤ z ≤ 3.8
Barro, Guillermo; Übler, Hannah; Siana, Brian +15 more
We present ionized gas kinematics for 681 galaxies at $z\sim 1.4\mbox{--}3.8$ from the MOSFIRE Deep Evolution Field survey, measured using models that account for random galaxy-slit misalignments together with structural parameters derived from CANDELS Hubble Space Telescope (HST) imaging. Kinematics and sizes are used to derive dynamical masses. …
Updated Parameters and a New Transmission Spectrum of HD 97658b
Mikal-Evans, Thomas; Henry, Gregory W.; Knutson, Heather A. +23 more
Recent years have seen increasing interest in the characterization of sub-Neptune-sized planets because of their prevalence in the Galaxy, contrasted with their absence in our solar system. HD 97658 is one of the brightest stars hosting a planet of this kind, and we present the transmission spectrum of this planet by combining four Hubble Space Te…