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Bow shocks, nova shells, disc winds and tilted discs: the nova-like V341 Ara has it all
Altamirano, D.; Knigge, C.; James, D. J. +21 more
V341 Ara was recently recognized as one of the closest (d ≃ 150 pc) and brightest (V ≃ 10) nova-like cataclysmic variables. This unique system is surrounded by a bright emission nebula, likely to be the remnant of a recent nova eruption. Embedded within this nebula is a prominent bow shock, where the system's accretion disc wind runs into its own …
In-flight testing of the injection of the LISA Pathfinder test mass into a geodesic
Mendes, L.; Russano, G.; Nofrarias, M. +77 more
LISA Pathfinder is a technology demonstrator space mission, aimed at testing key technologies for detecting gravitational waves in space. The mission is the precursor of LISA, the first space gravitational waves observatory, whose launch is scheduled for 2034. The LISA Pathfinder scientific payload includes two gravitational reference sensors (GRS…
The Northward IMF Magnetosphere
Fear, Robert C.
Linking globular cluster structural parameters and their evolution: multiple stellar populations
Mastrobuono-Battisti, Alessandra; Perets, Hagai B.
Globular clusters (GCs) are known to host multiple stellar populations showing chemical anomalies in the content of light elements. The origin of such anomalies observed in Galactic GCs is still debated. Here we analyse data compiled from the Hubble Space Telescope, ground-based surveys, and Gaia Data Release 2 (DR2) and explore relationships betw…
Precise Timing and Phase-resolved Spectroscopy of the Young Pulsar J1617-5055 with NuSTAR
Pavlov, George G.; Kargaltsev, Oleg; Hare, Jeremy +2 more
We report on a Nuclear Spectroscopic Telescope Array (NuSTAR) observation of the young, energetic pulsar PSR J1617-5055. Parkes Observatory 3 GHz radio observations of the pulsar (taken about 7 yr before the NuSTAR observations) are also reported here. NuSTAR detected pulsations at a frequency of f ≈ 14.4 Hz (P ≈ 69.44 ms) and, in addition, the ob…
Energy Budget of Plasma Motions, Heating, and Electron Acceleration in a Three-loop Solar Flare
Kontar, Eduard P.; Fleishman, Gregory D.; Nita, Gelu M. +2 more
Nonpotential magnetic energy promptly released in solar flares is converted to other forms of energy. This may include nonthermal energy of flare-accelerated particles, thermal energy of heated flaring plasma, and kinetic energy of eruptions, jets, upflows/downflows, and stochastic (turbulent) plasma motions. The processes or parameters governing …
Is the eclipsing binary RR Dra dancing with a hidden tertiary black hole candidate?
Zhu, Li-Ying; Wang, Zhi-Hua
Analysis of timing variation of the eclipsing binary RR Dra implies the existence of an additional object with mass of no less than 3.5(±0.2) M⊙. This third object is orbiting around the central eclipsing pair once every 98(±1) yr, making the whole a hierarchical triple system. However, reliable photometric solutions based on light curv…
Remote sensing of cometary bow shocks: modelled asymmetric outgassing and pickup ion observations
Alho, Markku; Jarvinen, Riku; Simon Wedlund, Cyril +3 more
Despite the long escort by the ESA Rosetta mission, direct observations of a fully developed bow shock around 67P/Churyumov-Gerasimenko have not been reported. Expanding on our previous work on indirect observations of a shock, we model the large-scale features in cometary pickup ions, and compare the results with the ESA Rosetta Plasma Consortium…
Mars Methane Sources in Northwestern Gale Crater Inferred From Back Trajectory Modeling
Yung, Y. L.; Luo, Y.; Lin, J. C. +3 more
During its first seven years of operation, the Sample Analysis at Mars Tunable Laser Spectrometer (TLS) on board the Curiosity rover has detected seven methane spikes above a low background abundance in Gale crater. The methane spikes are likely sourced by surface emission within or around Gale crater. Here, we use inverse Lagrangian modeling tech…
The Dynamic Formation of Pseudostreamers
Antiochos, Spiro K.; Scott, Roger B.; Pontin, David I. +2 more
Streamers and pseudostreamers structure the corona at the largest scales, as seen in both eclipse and coronagraph white-light images. Their inverted-goblet appearance encloses broad coronal loops at the Sun and tapers to a narrow radial stalk away from the star. The streamer associated with the global solar dipole magnetic field is long-lived, pre…