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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…
What Holes in the Gas Distribution of Nearly Face-on Galaxies Can Tell Us about the Host Disk Parameters: The Case of the NGC 628 Southeast Superbubble
Mayya, Y. D.; Silich, S.; Zaragoza-Cardiel, J. +1 more
Here we explore the impact of all major factors, such as the nonhomogeneous gas distribution, galactic rotation, and gravity, on the observational appearance of superbubbles in nearly face-on spiral galaxies. The results of our 3D numerical simulations are compared to the observed gas column density distribution in the largest southeast superbubbl…
Association Between a Failed Prominence Eruption and the Drainage of Mass from Another Prominence
Feng, Li; Lu, Lei; Li, Qiao +31 more
Sympathetic eruptions of solar prominences have been studied for decades, however, it is usually difficult to identify their causal links. Here, we present two failed prominence eruptions on 26 October 2022 and explore their connections. Using stereoscopic observations, the South prominence (PRO-S) erupts with untwisting motions, flare ribbons occ…
Debris Disks Can Contaminate Mid-infrared Exoplanet Spectra: Evidence for a Circumstellar Debris Disk around Exoplanet Host WASP-39
Nikolov, Nikolay; Stevenson, Kevin B.; Kirk, James +21 more
The signal from a transiting planet can be diluted by astrophysical contamination. In the case of circumstellar debris disks, this contamination could start in the mid-infrared and vary as a function of wavelength, which would then change the observed transmission spectrum for any planet in the system. The MIRI/Low Resolution Spectrometer WASP-39b…