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Regulation of accretion by its outflow in a symbiotic star: the 2016 outflow fast state of MWC 560
Sokoloski, J. L.; Luna, G. J. M.; Munari, U. +11 more
How are accretion discs affected by their outflows? To address this question for white dwarfs accreting from cool giants, we performed optical, radio, X-ray, and ultraviolet observations of the outflow-driving symbiotic star MWC 560 (≡V694 Mon) during its 2016 optical high state. We tracked multi-wavelength changes that signalled an abrupt increas…
Rapid luminosity decline and subsequent reformation of the innermost dust distribution in the changing-look AGN Mrk 590
Minezaki, Takeo; Kokubo, Mitsuru
We examine the long-term optical/near-infrared (NIR) flux variability of a 'changing-look' active galactic nucleus (AGN) Mrk 590 between 1998 and 2007. Multiband multi-epoch optical/NIR photometry data from the SDSS Stripe 82 data base and the Multicolor Active Galactic Nuclei Monitoring (MAGNUM) project reveal that Mrk 590 experienced a sudden lu…
First Observation of a Type II Solar Radio Burst Transitioning between a Stationary and Drifting State
Kontar, Eduard P.; Chrysaphi, Nicolina; Reid, Hamish A. S.
Standing shocks are believed to be responsible for stationary Type II solar radio bursts, whereas drifting Type II bursts are excited by moving shocks often related to coronal mass ejections (CMEs). Observations of either stationary or drifting Type II bursts are common, but a transition between the two states has not yet been reported. Here, we p…
Interplanetary Coronal Mass Ejections as the Driver of Non-recurrent Forbush Decreases
Papaioannou, Athanasios; Belov, Anatoly; Abunina, Maria +5 more
Interplanetary coronal mass ejections (ICMEs) are the counterparts of coronal mass ejections (CMEs) that extend in the interplanetary (IP) space and interact with the underlying solar wind (SW). ICMEs and their corresponding shocks can sweep out galactic cosmic rays (GCRs) and thus modulate their intensity, resulting in non-recurrent Forbush decre…
Resolving 3D Disk Orientation Using High-resolution Images: New Constraints on Circumgalactic Gas Inflows
Martin, Crystal L.; Ho, Stephanie H.
We constrain gas inflow speeds in star-forming galaxies with color gradients consistent with inside-out disk growth. Our method combines new measurements of disk orientation with previously described circumgalactic absorption in background quasar spectra. Two quantities, a position angle and an axis ratio, describe the projected shape of each gala…
Inferred time-scales for common envelope ejection using wide astrometric companions
Igoshev, Andrei P.; Perets, Hagai B.; Michaely, Erez
Evolution of close binaries often proceeds through the common envelope stage. The physics of the envelope ejection (CEE) is not yet understood, and several mechanisms were suggested to be involved. These could give rise to different time-scales for the CEE mass-loss. In order to probe the CEE-time-scales we study wide companions to post-CE binarie…
Labyrinth terrain on Titan
Malaska, Michael J.; Lopes, Rosaly M. C.; Solomonidou, Anezina +14 more
The Cassini/Huygens mission revealed a terrain type on Saturn's moon Titan of dissected, elevated plateaux with a high density of valleys named labyrinth terrain. We define four subtypes of labyrinth terrains: valleyed, polygonal, finely-dissected, and the possible outlier Kronin Labyrinth. We mapped the locations of all labyrinths imaged by Cassi…
Discovery and characterization of the exoplanets WASP-148b and c. A transiting system with two interacting giant planets
Bouchy, F.; Deleuil, M.; Queloz, D. +39 more
We present the discovery and characterization of WASP-148, a new extrasolar system that includes at least two giant planets. The host star is a slowly rotating inactive late-G dwarf with a V = 12 magnitude. The planet WASP-148b is a hot Jupiter of 0.72 RJup and 0.29 MJup that transits its host with an orbital period of 8.80 d…
Heliospheric energetic neutral atoms: Non-stationary modelling and comparison with IBEX-Hi data
Izmodenov, V. V.; Alexashov, D. B.; Baliukin, I. I.
The interstellar boundary explorer (IBEX) has been measuring fluxes of the energetic neutral atoms (ENAs) using the IBEX-Hi (0.3-6 keV) instrument since 2008. We have developed a numerical time-depended code to calculate globally distributed flux (GDF) of hydrogen ENAs employing both (1) 3D kinetic-MHD model of the global heliosphere and (2) recon…
Star catalog position and proper motion corrections in asteroid astrometry II: The Gaia era
Eggl, Siegfried; Chesley, Steven R.; Farnocchia, Davide +1 more
Astrometric positions of moving objects in the Solar System have been measured using a variety of star catalogs in the past. Previous work has shown that systematic errors in star catalogs can affect the accuracy of astrometric observations. That, in turn, can influence the resulting orbit fits for minor planets. In order to quantify these systema…