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Lens parameters for Gaia18cbf - a long gravitational microlensing event in the Galactic plane
Mróz, P.; Gromadzki, M.; Narita, N. +29 more
Context. The timescale of a microlensing event scales as a square root of a lens mass. Therefore, long-lasting events are important candidates for massive lenses, including black holes.
Aims: Here, we present the analysis of the Gaia18cbf microlensing event reported by the Gaia Science Alerts system. It exhibited a long timescale and features…
Nebular-phase spectra of Type Ia supernovae from the Las Cumbres Observatory Global Supernova Project
Wheeler, J. C.; Galbany, L.; Howell, D. A. +17 more
The observed diversity in Type Ia supernovae (SNe Ia) - the thermonuclear explosions of carbon-oxygen white dwarf stars used as cosmological standard candles - is currently met with a variety of explosion models and progenitor scenarios. To help improve our understanding of whether and how often different models contribute to the occurrence of SNe…
Revealing the Nature of a Lyα Halo in a Strongly Lensed Interacting System at z = 2.92
Rigby, Jane R.; Sharon, Keren; Infante, Leopoldo +12 more
Spatially extended halos of H I Lyα emission are now ubiquitously found around high-redshift star-forming galaxies. But our understanding of the nature and powering mechanisms of these halos is still hampered by the complex radiative transfer effects of the Lyα line and limited angular resolution. In this paper, we present resolved Multi Unit Spec…
Two Candidate KH 15D-like Systems from the Zwicky Transient Facility
Fang, Min; Zang, Weicheng; Dong, Subo +8 more
KH 15D contains a circumbinary disk that is tilted relative to the orbital plane of the central binary. The precession of the disk and the orbital motion of the binary together produce rich phenomena in the photometric light curve. In this work, we present the discovery and preliminary analysis of two objects that resemble the key features of KH 1…
The Rapidly Evolving Asymptotic Giant Branch Star, V Hya: ALMA Finds a Multiring Circus with High-velocity Outflows
Sahai, R.; Morris, M. R.; Lee, C. -F. +3 more
We have observed the mass-losing carbon star V Hya that is apparently transitioning from an asymptotic giant branch star to a bipolar planetary nebula, at an unprecedented angular resolution of ~0.″4-0.″6 with the Atacama Large Millimeter/submillimeter Array. Our 13CO and 12CO (J = 3-2 and J = 2-1) images have led to the disc…
ALMA Detections of [O III] and [C II] Emission Lines From A1689-zD1 at z = 7.13
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +10 more
A1689-zD1 is one of the most distant galaxies, discovered with the aid of gravitational lensing, providing us with an important opportunity to study galaxy formation in the very early universe. In this study, we report the detection of [C II]158 µm and [O III]88 µm emission lines of A1689-zD1 in the Atacama Large Millimeter/submillimet…
Characterization of hot populations of Melotte 66 open cluster using Swift/UVOT
Subramaniam, Annapurni; Panthi, Anju; Vaidya, Kaushar +3 more
Ultraviolet (UV) wavelength observations have made a significant contribution to our understanding of hot stellar populations of star clusters. Multiwavelength spectral energy distributions (SEDs) of stars, including ultraviolet observations, have proven to be an excellent tool for discovering unresolved hot companions in exotic stars such as blue…
Phase spirals in cosmological simulations of Milky Way-sized galaxies
Antoja, T.; Ramos, P.; García-Conde, B. +2 more
We study the vertical perturbations in the galactic disc of the Milky Way-size high-resolution hydrodynamical cosmological simulation named GARROTXA. We detect phase spirals in the vertical projection Z - VZ of disc's stellar particles for the first time in this type of simulations. Qualitatively similar structures were detected in the …
The Rotation of Magnetic Flux Ropes Formed during Solar Eruption
Wang, Yuming; Liu, Rui; Jiang, Chaowei +3 more
Eruptions of solar filaments often show rotational motion about their rising direction, but the mechanism governing such rotation, and how the rotation is related to the initial morphology of the preeruptive filament (and cospatial sigmoid), filament chirality, and magnetic helicity, remains elusive. The conventional view of rotation as a result o…
Modeling the Transport of Relativistic Solar Protons along a Heliospheric Current Sheet during Historic GLE Events
Laitinen, Timo; Dalla, Silvia; Waterfall, Charlotte O. G. +2 more
There are many difficulties associated with forecasting high-energy solar particle events at Earth. One issue is understanding why some large solar eruptive events trigger ground-level enhancement (GLE) events and others do not. In this work we perform 3D test particle simulations of a set of historic GLEs to understand more about what causes thes…