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A Radio Pinwheel Emanating from WR 147
Toalá, Jesús A.; Carrasco-González, Carlos; Rodríguez, Luis F. +2 more
Wolf-Rayet (WR) stars are evolved massive stars, presumably on their way to becoming supernovae. They are characterized by high luminosities and fast and dense stellar winds. We have detected signs of a radio continuum pinwheel associated with WR 147, a nitrogen-rich WR star with spectral subtype WN8. These structures are known to exist around a h…
E0102-VR: Exploring the scientific potential of Virtual Reality for observational astrophysics
Baracaglia, E.; Vogt, F. P. A.
Virtual Reality (VR) technology has been subject to a rapid democratization in recent years, driven in large by the entertainment industry, and epitomized by the emergence of consumer-grade, plug-and-play, room-scale VR devices. To explore the scientific potential of this technology for the field of observational astrophysics, we have created an e…
Exoplanets in the Antarctic Sky. III. Stellar Flares Found by AST3-II (CHESPA) within the Southern CVZ of TESS
Wittenmyer, Robert A.; Wang, Lifan; Yang, Ming +39 more
The CHinense Exoplanet Searching Program from Antarctica is a ground-based wide-field photometric survey using the AST3 and CSTAR telescopes located at Dome A, Antarctica. Blessed with the unparalleled observing conditions on the highest point of the Antarctic plateau, three remotely controlled, fully automatic telescopes (AST3-I, AST3-II, and CST…
Improved calibrations of the stellar occultation data accumulated by the SPICAV UV onboard Venus Express
Montmessin, Franck; Bertaux, Jean-Loup; Korablev, Oleg +2 more
Stellar occultation is a powerful method to study vertical structure of the Venus night mesosphere. The UV channel of SPICAV spectrometer, operated in 2006-2014 on board ESA's Venus Express orbiter, allowed retrieval profiles of atmospheric gases (CO2, SO2, and O3) and aerosols. It was also able to register differe…
Digitization of Astronegatives of the Pulkovo Glass Library: Positions of Saturn's Major Satellites in the Period 1972-1982 in the Gaia DR2 System
Izmailov, I. S.; Vasil'eva, T. A.; Khovrichev, M. Yu. +3 more
We present the results of the re-reduction of Pulkovo photographic plates with images of Saturn's major satellites in the Gaia DR2 catalog system (169 plates, 3007 individual positions). Astronegatives were taken with the 26-inch refractor at the Pulkovo Observatory between 1972 and 1982. The intrinsic accuracy of measurement of astronegatives usi…
Galaxy Cluster Mass Estimates in the Presence of Substructure
Mateo, Mario; Olszewski, Edward W.; Miller, Christopher J. +3 more
We develop and implement a model to analyze the internal kinematics of galaxy clusters that may contain subpopulations of galaxies that do not independently trace the cluster potential. The model allows for substructures within the cluster environment and disentangles cluster members from contaminating foreground and background galaxies. We estima…
A hundred new eclipsing binary system candidates studied in a near-infrared window in the VVV survey
Minniti, D.; Saito, R. K.; Palma, T. +4 more
We present the first results obtained from an extensive study of eclipsing binary (EB) system candidates recently detected in the VISTA Variables in the Vía Láctea (VVV) near-infrared (NIR) Survey. We analyse the VVV tile d040 in the southern part of the Galactic disc wherein the interstellar reddening is comparatively low, which makes it possible…
Hypercompact stellar clusters: morphological renditions and spectrophotometric models
Hernandez, S.; Kostrzewa-Rutkowska, Z.; Jonker, P. G. +2 more
Numerical relativity predicts that the coalescence of a black hole (BH) binary causes the newly formed BH to recoil, and evidence for such recoils has been found in the gravitational waves observed during the merger of stellar-mass BHs. Recoiling (super)massive BHs are expected to reside in hypercompact stellar clusters (HCSCs). Simulations of gal…
The brown dwarf population in the star-forming region NGC 2264
Scholz, Aleks; Teixeira, Paula S.; Eislöffel, Jochen +2 more
The brown dwarf population in the canonical star-forming region NGC 2264 is so far poorly explored. We present a deep, multiwavelength, multiepoch survey of the star-forming cluster NGC 2264, aimed to identify young brown dwarf candidates in this region. Using criteria including optical/near-infrared (IR) colours, variability, Spitzer mid-IR colou…
Robust Adaptive Spacecraft Array Derivative Analysis
Vogt, J.; Blagau, A.; Pick, L.
Multispacecraft missions such as Cluster, Themis, Swarm, and MMS contribute to the exploration of geospace with their capability to produce gradient and curl estimates from sets of spatially distributed in situ measurements. This paper combines all existing estimators of the reciprocal vector family for spatial derivatives and their errors. The re…