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Physical and orbital properties of the stellar system HIP 43766
Widyan, Hatem; Aljboor, Hussam
In this paper, we present the analysis of the stellar binary system HIP 43766 to determine its properties. We rely on dynamical modeling and atmospheric modeling with recent data to determine the orbital solution and the physical properties of the system. There is a consistency between observed and synthetic photometry obtained using atmospheric m…
VLT/MUSE and ATCA Observations of the Host Galaxy of the Short GRB 080905A at z = 0.122
Hunt, L. K.; Hartmann, D. H.; Klose, S. +4 more
Short-GRB progenitors could come in various flavors, depending on the nature of the merging compact stellar objects (including a stellar-mass black hole or not) or depending on their ages (millions or billions of years). At a redshift of z = 0.122, the nearly face-on spiral host of the short GRB 080905A is one of the closest short-GRB host galaxie…
The low electrical conductivity of Titan's lower atmosphere
Lorenz, Ralph D.
Titan's near-surface atmosphere, with a relatively high density and with weak ion production by cosmic rays or other sources, likely has a lower electrical conductivity than the Earth's, possibly <1 fS/m. Direct measurements by the Relaxation Probe on Huygens constrain it to be <0.5 pS/m, and extrapolation from higher altitudes suggests orde…
Hot Plasma in the Magnetotail Lobes Shows Characteristics Consistent With Closed Field Lines Trapped in the Lobes
Coxon, John C.; Fear, Robert C.; Reidy, Jade A. +2 more
We examine the magnetotail using data from the Hot Ion Analyzer on Cluster 1 during 2001-2009. We develop and utilize an algorithm in order to identify times during which Cluster 1 is in the magnetotail lobe but observes plasma, which is hotter than our expectations of the lobe. We analyze the prevailing Interplanetary Magnetic Field (IMF) BZ…
Physical characterization of S169: a prototypical IR bubble associated with the massive star-forming region IRAS 12326-6245
Reynoso, E. M.; Cichowolski, S.; Bronfman, L. +5 more
Aims: With the aim of studying the physical properties of Galactic IR bubbles and to explore their impact in massive star formation, we present a study of the IR bubble S169, associated with the massive star forming region IRAS 12326-6245.
Methods: We used CO (2-1),13CO (2-1), C18O (2-1), HCN (3-2), and HCO+
Caldera Collapse and Volcanic Resurfacing in Arabia Terra Provide Hints of Vast Under-Recognized Early Martian Volcanism
Michalski, Joseph R.; Wright, Shawn P.; Chu, Yin Yau Yoyo +1 more
Arabia Terra is an ancient, geologically complex region of Mars. It is not typically described as volcanic because it lacks prominent, easily recognizable shield volcanoes. However, Arabia Terra contains flood lavas and widespread layered materials that might represent airfall pyroclastics from unknown sources. Here we explore the geology of some …
Variable X-Ray Emission of Comet 46P/Wirtanen
Bodewits, Dennis; Christian, Damian J.; Koutroumpa, Dimitra +3 more
In this paper, we present an analysis of X-ray and optical/ultraviolet (UV) data from the favorable (Δ ~ 0.077 au) 2018 apparition of comet 46P/Wirtanen. The comet was observed during three different epochs (before, during, and after perihelion) over a 1.5 month period using the X-Ray Telescope (XRT) and Ultraviolet and Optical Telescope (UVOT) in…
A source of gamma rays coincident with the shell of the supernova remnant CTB 80
Araya, M.; Herrera, C.
CTB 80 (G69.0+2.7) is a relatively old (50-80 kyr) supernova remnant (SNR) with a complex radio morphology showing three extended radio arms and a radio and X-ray nebula near the location of the pulsar PSR B1951+32. We report on a study of the GeV emission in the region of CTB 80 with Fermi-Large Area Telescope data. An extended source with a size…
Modeling of observations of the OH nightglow in the Venusian mesosphere
Bougher, S. W.; Parkinson, C. D.; Yung, Y. L. +4 more
Venus airglow emissions have been unambiguously detected in the wavelength ranges of 1.40-1.49 and 2.6-3.14 µm in limb observations by the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) onboard the Venus Express (VEx) spacecraft and are attributed to the OH(2-0) and OH(1-0) Meinel band transitions. The integrated (limb slant path…
The cold dust content of the nearby galaxies IC 5325, NGC 7496, NGC 7590, and NGC 7599
Crawford, T. M.; Vieira, J. D.; Ashby, M. L. N. +6 more
Star-forming galaxies are rich reservoirs of dust, both warm and cold. But the cold dust emission is faint alongside the relatively bright and ubiquitous warm dust emission. Recently, evidence for a very cold dust (VCD) component has also been revealed via millimetre/submillimetre (mm/sub-mm) photometry of some galaxies. This component, despite be…