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Soft gamma-ray selected giant radio galaxies: an update
Masetti, N.; Venturi, T.; Dallacasa, D. +9 more
We present an update on the sample of soft gamma-ray selected giant radio galaxies (GRGs) extracted from INTEGRAL/IBIS and Swift/BAT surveys; it includes eight new sources and one candidate object. In the new sample, all but one source display FR II radio morphologies; the only exception is B21144+35B, which is an FR I. The objects belong to both …
Determining Threshold Instrumental Resolutions for Resolving the Velocity Space Signature of Ion Landau Damping
Klein, K. G.; Verniero, J. L.; Howes, G. G. +1 more
Unraveling the physics of the entire turbulent cascade of energy in space and astrophysical plasmas from the injection of energy at large scales to the dissipation of that energy into plasma heat at small scales, represents an overarching, open question in heliophysics and astrophysics. The fast cadence and high phase space resolution of particle …
On the vanishing orbital X-ray variability of the eclipsing binary millisecond pulsar 47 Tuc W
Heinke, C. O.; Romani, R. W.; Freire, P. C. C. +2 more
Redback millisecond pulsars (MSPs) typically show pronounced orbital variability in their X-ray emission due to our changing view of the intrabinary shock (IBS) between the pulsar wind and stellar wind from the companion. Some redbacks ('transitional' MSPs) have shown dramatic changes in their multiwavelength properties, indicating a transition fr…
HD 76920 b pinned down: A detailed analysis of the most eccentric planetary system around an evolved star
Mustill, A. J.; Wittenmyer, R. A.; Pollard, K. R. +9 more
We present 63 new multi-site radial velocity (RV) measurements of the K1III giant HD 76920, which was recently reported to host the most eccentric planet known to orbit an evolved star. We focused our observational efforts on the time around the predicted periastron passage and achieved near-continuous phase coverage of the corresponding RV peak. …
The Heating and Pulsations of V386 Serpentis after Its 2019 Dwarf Nova Outburst
Bell, Keaton J.; Szkody, Paula; Sion, Edward M. +10 more
Following the pulsation spectrum of a white dwarf through the heating and cooling involved in a dwarf nova outburst cycle provides a unique view of the changes to convective driving that take place on timescales of months versus millennia for nonaccreting white dwarfs. In 2019 January the dwarf nova V386 Ser (one of a small number containing an ac…
V772 Cas: an ellipsoidal HgMn star in an eclipsing binary
Shultz, M. E.; Kochukhov, O.; Tkachenko, A. +4 more
The late B-type star V772 Cas (HD 10260) was previously suspected to be a rare example of a magnetic chemically peculiar star in an eclipsing binary system. Photometric observations of this star obtained by the TESS satellite show clear eclipses with a period of 5.0137 d accompanied by a significant out-of-eclipse variation with the same period. H…
Complexity of Magnetic-field Turbulence at Reconnection Exhausts in the Solar Wind at 1 au
Miranda, Rodrigo A.; Valdivia, Juan A.; Chian, Abraham C. -L. +1 more
Magnetic reconnection is a complex mechanism that converts magnetic energy into particle kinetic energy and plasma thermal energy in space and astrophysical plasmas. In addition, magnetic reconnection and turbulence appear to be intimately related in plasmas. We analyze the magnetic-field turbulence at the exhaust of four reconnection events detec…
A systematic study of photoionized emission and warm absorption signatures of the NLS1 Mrk 335
Liu, H.; Komossa, S.; Bambi, Cosimo +4 more
We present an analysis of all the archival high-resolution spectra of the narrow-line Seyfert 1 galaxy Mrk 335 obtained with Reflection Grating Spectrometer (RGS) onboard XMM-Newton. The spectra show rich emission and absorption features in low and intermediate flux intervals. We model the emission lines with the PION_XS grid and try to find any p…
Results from radiation environment measurements aboard ExoMars Trace Gas Orbiter in Mars science orbit in May 2018-December 2019
Semkova, Jordanka; Koleva, Rositza; Benghin, Victor +19 more
ExoMars is a joint ESA - Rosscosmos program for investigating Mars. Two missions are foreseen within this program: one consisting of the Trace Gas Orbiter (TGO), that carries scientific instruments for the detection of trace gases in the Martian atmosphere and for the location of their source regions, launched on March 14, 2016; and the other, fea…
Deep transfer learning for the classification of variable sources
Bailer-Jones, Coryn A. L.; Kim, Dae-Won; Yeo, Doyeob +1 more
Ongoing or upcoming surveys such as Gaia, ZTF, or LSST will observe the light curves of billions or more astronomical sources. This presents new challenges for identifying interesting and important types of variability. Collecting a sufficient amount of labeled data for training is difficult, especially in the early stages of a new survey. Here we…