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Plateaus, dips, and rebrightenings during the outbursts of WZ Sge: no magnetic propeller, but a veiling curtain
Knigge, C.; Castro Segura, N.; Long, K. S. +1 more
WZ Sge is the prototype of highly evolved, low-accretion rate dwarf novae (DNe). During the decline from eruptions, its light curve displays a 'dip' followed by ≃10 'echo outbursts'. The standard disc instability model does not account for this behaviour, which is also seen in other low-accretion rate DNe. One recent interpretation for these rapid…
Scattered Light in the Hinode/EIS and SDO/AIA Instruments Measured from the 2012 Venus Transit
Young, Peter R.; Viall, Nicholeen M.
Observations from the 2012 transit of Venus are used to derive empirical formulae for long- and short-range scattered light at locations on the solar disk observed by the Hinode Extreme ultraviolet Imaging Spectrometer (EIS) and the Solar Dynamics Observatory Atmospheric Imaging Assembly (AIA) instruments. Long-range scattered light comes from the…
X-Ray Spectroscopic Evidence of Charge Exchange Emission in the Disk of M51
Wang, Q. Daniel; Zhang, Shuinai; Sun, Wei +3 more
In the disks of spiral galaxies, diffuse soft X-ray emission is known to be strongly correlated with star-forming regions. However, this emission is not simply from a thermal-equilibrium plasma and its origin remains greatly unclear. In this work, we present an X-ray spectroscopic analysis of the emission from the northern hot spot; a region with …
Probing cool giants in unresolved galaxies using fluctuation eigenspectra: A demonstration using high-resolution MUSE observations of NGC 5128
Smith, Russell J.
I describe and demonstrate a new approach to using spectroscopic data to exploit Poisson sampling fluctuations in unresolved stellar populations. The method is introduced using spectra predicted for independent samples of stars from a 10 Gyr population using a simple stochastic spectral synthesis model. A principal components analysis shows that &…
Impact of dust loading on ozone, winds and heating rates in the atmosphere of mars: Seasonal variability, climatology and SPICAM observations
Haider, S. A.; Masoom, J.; Siddhi, Y. S. +2 more
We have used SPICAM-UV nadir observations for four Martian Years (MY27-MY30) to study the seasonal variability of column abundances of ozone and dust opacity at low latitudes (10°-30°), mid-latitudes (30°-50°) and high latitudes (50°-70°) in both hemispheres. The observed column abundances of ozone are compared with the Mars Climate Database (MCD,…
Simplified Automatic Atmospheric Correction for THEMIS Infrared Data
Edwards, Christopher S.; Rogers, A. Deanne; Ye, Cheng +1 more
Thermal infrared spectral data from the Thermal Emission Imaging System (THEMIS) on Mars Odyssey can provide diagnostic information to characterize Martian surface compositions. Accurately isolating the atmospheric contribution from the thermal radiance of THEMIS data is essential for surface mineralogy analysis. In this work, we present improved …
The MAVERIC Survey: The first radio and X-ray limits on the detached black holes in NGC 3201
Kamann, Sebastian; Dreizler, Stefan; Strader, Jay +11 more
The Galactic globular cluster (GC) NGC 3201 is the first Galactic GC observed to host dynamically confirmed stellar-mass black holes (BHs), containing two confirmed and one candidate BH. This result indicates that GCs can retain BHs, which has important implications for GC evolution. NGC 3201 has been observed as part of the MAVERIC survey of Gala…
A Suzaku sample of unabsorbed narrow-line and broad-line Seyfert 1 galaxies - II. Iron emission and absorption
Gallo, L. C.; Waddell, S. G. H.
A sample of 22 narrow-line type 1 Seyfert (NLS1) and 47 broad-line type 1 Seyfert (BLS1) galaxies observed with Suzaku is used to examine the Fe K-band properties of each group. Three different models are used to examine the presence of: narrow neutral Fe K α line at $6.4{\rm \, keV}$ and ionized Fe XXV and Fe XXVI emission lines (model A); a broa…
First investigation of the diamagnetic cavity boundary layer with a 1D3V PIC simulation
Gunell, H.; Nilsson, H.; Hamrin, M. +3 more
Context. Amongst the different features and boundaries encountered around comets, one remains of particular interest to the plasma community: the diamagnetic cavity. Crossed for the first time at 1P/Halley during the Giotto flyby in 1986 and later met more than 700 times by the ESA Rosetta spacecraft around Comet 67P/Churyumov-Gerasimenko, this re…
Detailed evolutionary models for twins in sight of new spectral data: AN Cam, RS Ari, and V455 Aur
Bakış, Volkan; Yücel, Gökhan
We present the evolutionary scenarios for three eclipsing twin (q(M2/M1) ~1) binary systems using their combined spectroscopic and photometric data. Using accurate TESS photometric data, RV measurements, and spectroscopic data enabled us to calculate fundamental parameters, such as mass and radius, better than 2 per cent. The…