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WASP-92, WASP-93, and WASP-118: transit timing variations and long-term stability of the systems
Evans, Phil; Gajdoš, Pavol; Vaňko, Martin +8 more
We studied three exoplanetary systems with transiting planets: WASP-92, WASP-93, and WASP-118. Using ground-based photometric observations of WASP-92 and WASP-93 and Kepler-K2 observations of WASP-118, we redetermined the orbital and physical parameters of these planets. The precise times of all transits were determined. We constructed O-C diagram…
3D hydrodynamical models of point-symmetric planetary nebulae: the special case of H 1-67
Velázquez, P. F.; Peña, M.; Rechy-García, J. S.
We present 3D hydrodynamical simulations of a precessing jet with a time-dependent ejection velocity or a time-dependent ejection density, interacting with a circumstellar medium given by a dense, anisotropic, and slow AGB wind, forming a torus. We explore a set of configurations with different values for the precession angle and number of ejectio…
Primeval very low-mass stars and brown dwarfs - V. A halo L3 subdwarf with prograde eccentric orbit in the Galactic plane
Burgasser, A. J.; Zhang, Z. H.; Smith, L. C.
VVV J12564163-6202039 is an L subdwarf located in the Galactic plane (b = 0{^{circ}.}831) discovered by its high proper motion (1.1 arcsec yr-1). We obtained an optical to near-infrared spectrum of it with the X-shooter on the Very Large Telescope, and re-classified it as an sdL3 subdwarf. Its best-fitting BT-Dusty model spec…
A SCUBA-2 selected Herschel-SPIRE dropout and the nature of this population
Andreani, P.; Yun, M. S.; Clements, D. L. +19 more
Dusty star-forming galaxies (DSFGs) detected at z > 4 provide important examples of the first generations of massive galaxies. However, few examples with spectroscopic confirmation are currently known, with Hershel struggling to detect significant numbers of z > 6 DSFGs. NGP6_D1 is a bright 850 µm source (12.3 ± 2.5 mJy) with no counte…
Axisymmetric density waves in Saturn's rings
Nicholson, P. D.; Hedman, M. M.
Density waves in Saturn's rings are usually tightly wrapped spiral patterns generated by resonances with either Saturn's moons or structures inside the planet. However, between the Barnard and Bessel Gaps in the Cassini Division (i.e. between 120 240 and 120 300 km from Saturn's spin axis), there are density variations that appear to form an axisy…
A nearby luminous AGN sample optically selected from Hubble Space Telescope
Li, Shuang-Liang
In this work, a nearby luminous active galactic nucleus (AGN) sample is selected from Hubble Space Telescope(HST), where only sources with both X-ray emission observed by Chandra/XMM-Newton and radio flux detected by Very Large Array (VLA)/Very Long Baseline Array (VLBA)/very long baseline interferometry (VLBI)/Multi-Element Radio Linked Interfero…
The Ursa Major Moving Group: a chronochemokinematic analysis
Sneden, C.; Dopcke, Gustavo; Porto de Mello, G. F.
Stars in kinematic groups are believed to share the same age, metallicity, and velocity vectors, and are disrupted by events such as encounters with massive objects, leaving a residue of stars sharing the same kinematic properties, thus bridging an important evolutionary gap between clusters and field stars. We determine the most likely metallicit…
Multifilter time-series observations of three short period ATLAS variable stars
Koen, Chris
The `Asteroid Terrestrial-impact Last Alert System' discovered hundreds of thousands of new candidate variable stars. Follow-up observations of three of these are reported in this paper. The targets were selected on the basis of having high probability of being periodic (false alarm probability for period detection smaller than 10-5), s…
Kinematics of subclusters in star cluster complexes: imprint of their parental molecular clouds
Fujii, M. S.
Star cluster complexes such as the Carina Nebula could have formed in turbulent giant molecular clouds. We perform a series of N-body simulations starting from subclustering initial conditions based on hydrodynamic simulations of turbulent molecular clouds. These simulations finally result in the formation of star cluster complexes consisting of s…
Non-thermal emission from massive star-forming regions: a possible SNR candidate G351.7-1.2?
Vig, S.; Ghosh, S. K.; Lal, D. V. +3 more
We present low-frequency wideband observations (300-500 MHz) of the star-forming complex G351.7-1.2 using upgraded Giant Metrewave Radio Telescope (uGMRT), India. Combining this with the optical, infrared, and submillimetre data, we analyse the large-scale diffuse radio emission associated with the region that exhibits a broken shell morphology. T…