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MAVEN and the total electron content of the Martian ionosphere
Leblanc, François; Chaufray, Jean-Yves; Forget, François +13 more
Model studies of the ionosphere of Mars under daytime conditions reveal that for solar zenith angles of 0°-40°, the shapes and magnitudes of the electron density profiles Ne(h) change by only small amounts. This suggests that midday observations made by MAVEN instruments along slanted orbit segments can be used to represent vertical pro…
Simultaneous Multiwavelength Observations of V404 Cygni during its 2015 June Outburst Decay Strengthen the Case for an Extremely Energetic Jet-base
Maccarone, Thomas J.; Grinberg, Victoria; Reynolds, Mark T. +4 more
We present results of multiband optical photometry of the black hole X-ray binary system V404 Cyg obtained using Wheaton College Observatory’s 0.3 m telescope, along with strictly simultaneous INTEGRAL and Swift observations during 2015 June 25.15-26.33 UT, and 2015 June 27.10-27.34 UT. These observations were made during the 2015 June outburst of…
Reverberation Mapping of PG 0934+013 with the Southern African Large Telescope
Barth, Aaron J.; Im, Myungshin; Jeon, Yiseul +10 more
We present the variability and time-lag measurements of PG 0934+013 based on a photometric and spectroscopic monitoring campaign over a two year period. We obtained 46 epochs of data from the spectroscopic campaign, which was carried out using the Southern African Large Telescope with ∼1 week cadence over two sets of four month-long observing peri…
Wayne—A Simulator for HST WFC3 IR Grism Spectroscopy
Tsiaras, A.; Varley, R.; Karpouzas, K.
Wayne is an algorithm that simulates Hubble Space Telescope Wide Field Camera 3 (WFC3) grism spectroscopic frames, including sources of noise and systematics. It can simulate both staring and spatial scan modes, and observations such as the transit and the eclipse of an exoplanet. Unlike many other instrument simulators, the focus of Wayne is on c…
A Spectroscopic Orbit for the Late-type Be Star β CMi
Wang, Luqian; Klement, Robert; Richardson, Noel D. +12 more
The late-type Be star β CMi is remarkably stable compared to other Be stars that have been studied. This has led to a realistic model of the outflowing Be disk by Klement et al. These results showed that the disk is likely truncated at a finite radius from the star, which Klement et al. suggest is evidence for an unseen binary companion in orbit. …
XMM-Newton observations of the non-thermal supernova remnant HESS J1731-347 (G353.6-0.7)
Klochkov, D.; Santangelo, A.; Pühlhofer, G. +4 more
We report on the analysis of XMM-Newton observations of the non-thermal shell-type supernova remnant HESS J1731-347 (G353.6-0.7). For the first time the complete remnant shell has been covered in X-rays, which allowed direct comparison with radio and TeV observations. We carried out a spatially resolved spectral analysis of XMM-Newton data and con…
Evolution of Dust-obscured Star Formation and Gas to z = 2.2 from HiZELS
Thomson, A. P.; Smail, Ian; Ibar, E. +6 more
We investigate the far-infrared (far-IR) properties of galaxies selected via deep, narrow-band imaging of the Hα emission line in four redshift slices from z=0.40{--}2.23 over ∼1 deg2 as part of the High-redshift Emission Line Survey (HiZELS). We use a stacking approach in the Herschel PACS/SPIRE far-IR bands, along with 850 µ {{m…
Gaia TGAS search for Large Magellanic Cloud runaway supergiant stars. Candidate hypervelocity star discovery and the nature of R 71
van der Marel, Roeland P.; Lennon, Daniel J.; Sahlmann, Johannes +2 more
Aims: Our research aims to search for runaway stars in the Large Magellanic Cloud (LMC) among the bright Hipparcos supergiant stars included in the Gaia DR1 Tycho-Gaia astrometric solution (TGAS) catalogue.
Methods: We compute the space velocities of the visually brightest stars in the Large Magellanic Cloud that are included in the TGAS…
High-resolution Observations of a White-light Flare with NST
Cho, K. -S.; Xu, Y.; Yurchyshyn, V. +4 more
Using high-resolution data from the New Solar Telescope, we studied fine spatial and temporal details of an M1.3 white-light (WL) flare, which was one of three homologous solar flares (C6.8, M1.3, and M2.3) observed in close proximity to the west solar limb on 2014 October 29 in NOAA active region 12192. We report that the TiO WL flare consists of…
Apparent and Intrinsic Evolution of Active Region Upflows
Janvier, Miho; Baker, Deborah; Démoulin, Pascal +1 more
We analyze the evolution of Fe XII coronal plasma upflows from the edges of ten active regions (ARs) as they cross the solar disk using the Hinode Extreme Ultraviolet Imaging Spectrometer (EIS) to do this. Confirming the results of Démoulin et al. (Sol. Phys.283, 341, 2013), we find that for each AR there is an observed long-term evolution of the …