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Spectroscopic Orbits of Subsystems in Multiple Stars. IV. Double-lined Pairs
Tokovinin, Andrei
Spectroscopic orbits are computed for inner pairs in nine hierarchical multiple systems (HIP 19639, 60845, 75663, 76816, 78163, 78416, 80448, 84789, and HD 105080) and for one simple binary HIP 61840. All subsystems are double-lined, and their periods range from 2.27 to 30.4 days. Five spectroscopic binaries are twins with equal masses. Each hiera…
The Main Belt Asteroid Shape Distribution from Gaia Data Release 2
Moskovitz, Nicholas; Mommert, Michael; Trilling, David E. +2 more
Gaia Data Release 2 includes observational data for 14099 pre-selected asteroids. From the sparsely sampled G-band photometry, we derive lower-limit light curve amplitudes for 11665 main belt asteroids (MBA) in order to provide constraints on the distribution of shapes in the asteroid main belt. Assuming a triaxial shape model for each asteroid, d…
HATS-50b through HATS-53b: Four Transiting Hot Jupiters Orbiting G-type Stars Discovered by the HATSouth Survey
Henning, Th.; Mancini, L.; Rabus, M. +26 more
We report the discovery of four close-in transiting exoplanets (HATS-50b through HATS-53b), discovered using the HATSouth three-continent network of homogeneous and automated telescopes. These new exoplanets belong to the class of hot Jupiters and orbit G-type dwarf stars, with brightness in the range V = 12.5-14.0 mag. While HATS-53 has many phys…
WEIRD: Wide-orbit Exoplanet Search with InfraRed Direct Imaging
Gagné, Jonathan; Albert, Loïc; Doyon, René +9 more
We report results from the Wide-orbit Exoplanet search with InfraRed Direct imaging, or WEIRD, a survey designed to search for Jupiter-like companions on very wide orbits (1000-5000 au) around young stars (<120 Myr) that are known members of moving groups in the solar neighborhood (<70 pc). Companions that share the same age, distance, and m…
The Globular Cluster NGC 6402 (M14). II. Variable Stars
Grundahl, F.; Catelan, M.; Smith, H. A. +2 more
We present time-series BVI photometry for the Galactic globular cluster NGC 6402 (M14). The data consist of ∼137 images per filter, obtained using the 0.9 and 1.0 m SMARTS telescopes at the Cerro Tololo Inter-American Observatory. The images were obtained during two observing runs in 2006-2007. The image-subtraction package ISIS, along with DAOPHO…
Europa’s Optical Aurora
Brown, Michael E.; de Kleer, Katherine
Auroral emissions provide opportunities to study the tenuous atmospheres of solar system satellites, revealing the presence and abundance of molecular and atomic species as well as their spatial and temporal variability. Far-UV aurorae have been used for decades to study the atmospheres of the Galilean satellites. Here we present the first detecti…
Dynamical Analysis of Three Distant Trans-Neptunian Objects with Similar Orbits
Smith, M.; Abbott, T. M. C.; Abdalla, F. B. +63 more
This paper reports the discovery and orbital characterization of two extreme trans-Neptunian objects (ETNOs), 2016 QV89 and 2016 QU89, which have orbits that appear similar to that of a previously known object, 2013 UH15. All three ETNOs have semimajor axes a ≈ 172 au and eccentricities e ≈ 0.77. The angular elemen…
Qatar Exoplanet Survey: Qatar-6b—A Grazing Transiting Hot Jupiter
Bieryla, Allyson; Latham, David W.; Baranec, Christoph +14 more
We report the discovery of Qatar-6b, a new transiting planet identified by the Qatar Exoplanet Survey (QES). The planet orbits a relatively bright (V = 11.44), early-K main-sequence star at an orbital period of P ∼ 3.506 days. An SED fit to available multi-band photometry, ranging from the near-UV to the mid-IR, yields a distance of d = 101 ± 6 pc…
The Grism Lens-amplified Survey from Space (GLASS). XII. Spatially Resolved Galaxy Star Formation Histories and True Evolutionary Paths at z > 1
Vulcani, B.; Hoag, A.; Bradač, M. +12 more
Modern data empower observers to describe galaxies as the spatially and biographically complex objects they are. We illustrate this through case studies of four z ∼ 1.3 systems based on deep, spatially resolved, 17-band + G102 + G141 Hubble Space Telescope grism spectrophotometry. Using full-spectrum rest-UV/-optical continuum fitting, we characte…
Back to “Normal” for the Disintegrating Planet Candidate KIC 12557548 b
Hirano, Teruyuki; Teske, Johanna; Rackham, Benjamin V. +5 more
KIC 12557548 b is the first of a growing class of intriguing disintegrating planet candidates, which lose mass in the form of a metal-rich vapor that condenses into dust particles. Here, we follow up on two perplexing observations of the system: (1) the transits appeared shallower than average in 2013 and 2014, and (2) the parameters derived from …