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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…
Modelling stellar irradiances I: the transition regions of FGKM stars
Del Zanna, G.; Deliporanidou, E.
We employed advanced ionization equilibrium models that we developed in Dufresne et al. (2024), which include charge transfer and density effects, to model UV stellar irradiances for a sample of stars. Our sample includes
Binary orbit and disks properties of the RW Aur system using ALMA observations
Dougados, C.; Facchini, S.; Manara, C. F. +8 more
Context. The dynamical interactions between young binaries can perturb the material distribution of their circumstellar disks, and modify the planet formation process. In order to understand how planets form in multiple stellar systems, it is necessary to characterize both their binary orbit and their disks properties. Aims. In order to constrain …
KBSS-InCLOSE. I. Design and First Results from the Inner Circumgalactic Medium of QSO Line-of-sight Emitting Galaxies at z ∼ 2–3
Pettini, Max; Erb, Dawn K.; Steidel, Charles C. +10 more
We present the design and first results of the inner circumgalactic medium (CGM) of QSO line-of-sight emitting galaxies at z ∼ 2–3, Keck Baryonic Structure Survey (KBSS)-InCLOSE. The survey will connect galaxy properties (e.g., stellar mass M *, interstellar medium, hereafter ISM, metallicity) with the physical conditions of the inner C…
The orbital parameters of the δ Cep inner binary system determined using 2019 HARPS-N spectroscopic data
Poretti, E.; Rainer, M.; Kervella, P. +12 more
Context. An inner companion has recently been discovered orbiting the prototype of classical Cepheids, δ Cep, whose orbital parameters are still not fully constrained.
Aims: We collected new precise radial velocity measurements of δ Cep in 2019 using the HARPS-N spectrograph mounted at the Telescopio Nazionale Galileo. Using these radial velo…
Evidence for a black hole in the historical X-ray transient A 1524-61 (= KY TrA)
Armas Padilla, M.; Monelli, M.; Muñoz-Darias, T. +5 more
We present Very Large Telescope spectroscopy, high-resolution imaging, and time-resolved photometry of KY TrA, the optical counterpart to the X-ray binary A 1524-61. We perform a refined astrometry of the field, yielding improved coordinates for KY TrA and the field star interloper of similar optical brightness that we locate 0.64 ± 0.04 arcsec SE…
Uncovering a new group of T Tauri stars in the Taurus-Auriga molecular complex from Gaia and GALEX data
Beitia-Antero, Leire; Gómez de Castro, Ana Inés; Canet, Ada +3 more
Context. Determining a complete census of young stars in any star forming region is a challenge even for the nearest and best-observed molecular clouds, such as Taurus-Auriga (TAMC). Deep surveys at infrared (IR) and X-ray wavelengths and astrometric surveys using Gaia DR2 and DR3 have been carried out to detect the sparse population and constrain…
Constraining the Number Density of the Accretion Disk Wind in Hercules X-1 Using Its Ionization Response to X-Ray Pulsations
Fabian, A. C.; Pinto, C.; Kara, E. +6 more
X-ray binaries are known to launch powerful accretion disk winds that can have a significant impact on the binary systems and their surroundings. To quantify the impact and determine the launching mechanisms of these outflows, we need to measure the wind plasma number density, an important ingredient in the theoretical disk wind models. While X-ra…