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High-energy monitoring of NGC 4593 II. Broad-band spectral analysis: testing the two-corona model
Bianchi, S.; Cappi, M.; Ponti, G. +9 more
It is widely believed that the primary X-ray emission of AGN is due to the Comptonization of optical-UV photons from a hot electron corona, while the origin of the `soft-excess' is still uncertain and matter of debate. A second Comptonization component, called warm corona, was therefore proposed to account for the soft-excess, and found in agreeme…
Unusual Plasma and Particle Signatures at Mars and STEREO-A Related to CME-CME Interaction
Dumbović, Mateja; Temmer, Manuela; Veronig, Astrid +15 more
On 2017 July 25 a multistep Forbush decrease (FD) with a remarkable total amplitude of more than 15% was observed by Mars Science Laboratory/Radiation Assessment Detector at Mars. We find that these particle signatures are related to very pronounced plasma and magnetic field signatures detected in situ by STEREO-A on 2017 July 24, with a higher-th…
HALO7D II: The Halo Velocity Ellipsoid and Velocity Anisotropy with Distant Main-sequence Stars
Anderson, Jay; van der Marel, Roeland P.; Wetzel, Andrew +7 more
The Halo Assembly in Lambda Cold Dark Matter: Observations in 7 Dimensions (HALO7D) data set consists of Keck II/DEIMOS spectroscopy and Hubble Space Telescope-measured proper motions of Milky Way halo main-sequence turnoff stars in the CANDELS fields. In this paper, the second in the HALO7D series, we present the proper motions for the HALO7D sam…
Binary Red Supergiants. II. Discovering and Characterizing B-type Companions
Massey, Philip; Levesque, Emily M.; Morrell, Nidia I. +1 more
The percentage of massive main-sequence OB stars in binary systems is thought to be as high as 100%. However, very few Galactic binary red supergiants (RSGs) have been identified, despite the fact that these stars are the evolved descendants of OB stars. As shown in our recent paper, binary RSGs will likely have B-type companions, as dictated by s…
Detections and constraints on white dwarf variability from time-series GALEX observations
Hermes, J. J.; Shappee, B. J.; Tucker, M. A. +1 more
We search for photometric variability in more than 23 000 known and candidate white dwarfs (WDs), the largest ultraviolet survey compiled for a single study of WDs. We use GPHOTON, a publicly available calibration/reduction pipeline, to generate time-series photometry of WDs observed by GALEX. By implementing a system of weighted metrics, we selec…
VLTI/PIONIER survey of disks around post-AGB binaries. Dust sublimation physics rules
Min, M.; Van Winckel, H.; Kamath, D. +4 more
Context. Post-asymptotic giant branch (AGB) binaries are surrounded by circumbinary disks of gas and dust that are similar to protoplanetary disks found around young stars.
Aims: We aim to understand the structure of these disks and identify the physical phenomena at play in their very inner regions. We want to understand the disk-binary inte…
Characteristics of the Flank Magnetopause: THEMIS Observations
Haaland, S.; Runov, A.; Angelopoulos, V. +1 more
The terrestrial magnetopause is the boundary that shields the Earth's magnetosphere on one side from the shocked solar wind and its embedded interplanetary magnetic field on the other side. In this paper, we show observations from two of the Time History of Events and Macroscales Interactions during Substorms (THEMIS) satellites, comparing dayside…
A Simflowny-based high-performance 3D code for the generalized induction equation
Viganò, Daniele; Pons, José A.; Martínez-Gómez, David +6 more
In the interior of neutron stars, the induction equation regulates the long-term evolution of the magnetic fields by means of resistivity, Hall dynamics and ambipolar diffusion. Despite the apparent simplicity and compactness of the equation, the dynamics it describes is not trivial and its understanding relies on accurate numerical simulations. W…
Linking the rotation of a cluster to the spins of its stars: the kinematics of NGC 6791 and NGC 6819 in 3D
Balbinot, E.; Hénault-Brunet, V.; Gieles, M. +2 more
The physics governing the formation of star clusters is still not entirely understood. One open question concerns the amount of angular momentum that newly formed clusters possess after emerging from their parent gas clouds. Recent results suggest an alignment of stellar spins and binary orbital spins in star clusters, which support a scenario in …
Dust Continuum Emission and the Upper Limit Fluxes of Submillimeter Water Lines of the Protoplanetary Disk around HD 163296 Observed by ALMA
Walsh, Catherine; Nomura, Hideko; Tsukagoshi, Takashi +6 more
In this paper, we analyze the upper limit fluxes of submillimeter ortho-H2 16O 321 GHz, para-H2 18O 322 GHz, and HDO 335 GHz lines from the protoplanetary disk around the Herbig Ae star HD 163296, using the Atacama Large Millimeter/Submillimeter Array. These water lines are considered to be the best cand…