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Modeling Transition Region Hot Loops on the Sun: The Necessity of Rapid, Complex Spatiotemporal Heating and Nonequilibrium Ionization
Bahauddin, Shah Mohammad; Bradshaw, Stephen J.
The study examines the heating profile of hot solar transition region loops, particularly focusing on transient brightenings observed in IRIS 1400 Å slit-jaw images. The findings challenge the adequacy of simplistic, singular heating mechanisms, revealing that the heating is temporally impulsive and requires a spatially complex profile with multip…
Oxygen Abundance Throughout the Dwarf Starburst Galaxy IC 10
Sandstrom, Karin; Armus, Lee; Runco, Jordan N. +5 more
Measurements of oxygen abundance throughout galaxies provide insight to the formation histories and ongoing processes. Here we present a study of the gas-phase oxygen abundance in the H II regions and diffuse gas of the nearby starburst dwarf galaxy, IC 10. Using the Keck Cosmic Web Imager at W. M. Keck Observatory, we map the central region of IC…
Diffuse interstellar bands as dust indicators: The contribution from 3D maps
Lallement, R.; Cox, N. L. J.; Vergely, J. L.
Context. Three-dimensional (3D) distributions of the 862 nm diffuse interstellar band (DIB) carrier have been computed based on Gaia parallaxes and DIB catalogues, in parallel with 3D maps of dust extinction density. Three-dimensional maps provide local diagnostics and information on the distribution of structures in addition to line-of-sight (LOS…
The Discovery of Three Galactic Wolf–Rayet Stars
Massey, Philip; Skiff, Brian A.; Marin, Laurella C. +1 more
Wolf–Rayet stars (WRs) are evolved massive stars in the brief stage before they undergo core collapse. Not only are they rare, but they also can be particularly difficult to find due to the high extinction in the Galactic plane. This paper discusses the discovery of three new Galactic WRs previously classified as Hα emission stars, but thanks to G…
Stellar Atmospheric Parameters for Cool Dwarfs in Gaia Data Release 3
Luo, A. -Li; Wang, Rui; Wang, You-Fen +4 more
We provide a catalog of atmospheric parameters for 1,806,921 cool dwarfs from Gaia Data Release 3 (DR3) that lie within the range covered by LAMOST cool dwarf spectroscopic parameters: 3200 K < T eff < 4300 K, ‑0.8 < [M/H] < 0.2 dex, and 4.5 < log g < 5.5 dex. Our values are derived based on machine-learning models tra…
SO2 and OCS toward high-mass protostars: A comparative study of ice and gas
van Dishoeck, Ewine F.; Nazari, Pooneh; van Gelder, Martijn L. +2 more
Context. OCS and SO2 are both major carriers of gaseous sulfur and are the only sulfurated molecules detected in interstellar ices to date. They are thus the ideal candidates for exploring the evolution of the volatile sulfur content throughout the different stages of star formation. Aims. We aim to investigate the chemical history of i…
Quasi-isotropic UV emission in the ULX NGC 1313 X-1
Castro Segura, N.; Gúrpide, A.
A major prediction of most super-Eddington accretion theories is the presence of anisotropic emission from supercritical discs, but the degree of anisotropy and its dependence on energy remain poorly constrained observationally. A key breakthrough allowing to test such predictions was the discovery of high-excitation photoionized nebulae around ul…
Effect of magnetospheric conditions on the morphology of Jupiter's ultraviolet main auroral emission as observed by Juno-UVS
Bonfond, B.; Vogt, M. F.; Gérard, J. -C. +9 more
Auroral emissions are a reflection of magnetospheric processes, and at Jupiter, it is not entirely certain how the morphology of the UV main emission (ME) varies with magnetospheric compression or the strength of the central current sheet. This work leverages the observations from Juno-UVS to link ME variability with particular magnetospheric stat…
Constraining light scalar field with torsion-balance gravity experiments
Qin, Cheng-Gang; Lu, Xiao-Yu; Zhao, Bing-Chen +5 more
The light scalar field with a coupling to standard model particles provide a possible source of the long-range Yukawa forces or violation of the weak equivalence principle, which can be potentially explored by precision gravity experiments. We describe the searches for such light scalar fields with the three types of gravity experiments, including…
Unipolar solar flares as a manifestation of 'topological' magnetic reconnection
Dumin, Yurii V.; Somov, Boris V.
Solar flares - the most prominent manifestation of solar activity - typically manifest themselves as a single or a set of luminous arcs (magnetic flux tubes) rooted in regions of opposite polarity in the photosphere. However, a careful analysis of archival data from the Hinode satellite reveals occasional surprising cases of flaring arcs whose foo…