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A theoretical framework for BL Her stars: III. A case study: Robust light curve optimization in the Large Magellanic Cloud
Marconi, Marcella; Ripepi, Vincenzo; Joyce, Meridith +8 more
Context. In the era of precision stellar astrophysics, classical pulsating stars play a crucial role in determinations of the cosmological distance scale thanks to their period-luminosity (PL) relations. Therefore, it is important to constrain their stellar evolution and pulsation models not only through a comparison of empirical and theoretical P…
Persistence and Burn-in in Solar Coronal Magnetic Field Simulations
Meyer, Karen A.; Yeates, Anthony R.; Hall, Eric J.
Simulations of solar phenomena play a vital role in space-weather prediction. A critical computational question for automating research workflows in the context of data-driven solar coronal magnetic field simulations is quantifying a simulation's burn-in time, after which a solar quantity has evolved away from an arbitrary initial condition to a p…
Characterization of seven transiting systems, including four warm Jupiters from SOPHIE and TESS
Deleuil, M.; Moutou, C.; Carmona, A. +65 more
While several thousand exoplanets are now confirmed, the number of known transiting warm Jupiters (10 d < period < 200 d) remains relatively small. These planets are generally believed to have formed outside the snowline and migrated to their current orbits. Because they are sufficiently distant from their host stars, they mitigate proximity…
Transonic Turbulence and Density Fluctuations in the Near-Sun Solar Wind
Li, H.; Zank, G. P.; Zhao, L. -L. +2 more
We use in situ measurements from the first 19 encounters of Parker Solar Probe and the most recent five encounters of Solar Orbiter to study the evolution of the turbulent sonic Mach number Mt (the ratio of the amplitude of velocity fluctuations to the sound speed) with radial distance and its relationship to density fluctuations. We fo…
The extent of formation of organic molecules in the comae of comets showing relatively high activity
Acharyya, Kinsuk; Ahmed, Sana
Comets are a rich reservoir of complex organic molecules. Ground and space-based observatories have recently greatly enhanced the cometary molecular inventory. Although these molecules' origin is believed to be the cometary nucleus, they can be partially synthesized in the coma. We studied organic molecules' nucleus versus coma origins for various…
Chemically peculiar stars as members of open clusters
Paunzen, E.; Prišegen, M.; Faltová, N. +12 more
The chemically peculiar (CP) stars of the upper main sequence are excellent astrophysical laboratories to test the diffusion, mass-loss, rotational mixing, and pulsation in the (non-)presence of a stable local magnetic field. These processes are time-dependent. The age estimation of Galactic field stars suffers from several limitations. Therefore,…
The Initial-to-final Mass Relation of White Dwarfs in Intermediate-separation Binaries
Hallakoun, Na'ama; Shahaf, Sahar; Ben-Ami, Sagi +1 more
We examine the applicability of the initial-to-final mass relation (IFMR) for white dwarfs (WDs) in intermediate-separation binary systems (∼1 au), using astrometric binaries identified in open clusters from Gaia DR3. A careful analysis of the astrometric orbits and spectral energy distributions isolates 33 main-sequence (MS) stars with highly lik…
Mining the time axis with TRON - II. MeerKAT detects a stellar radio flare from a distant RS CVn candidate
Tasse, C.; Heywood, I.; Oozeer, N. +14 more
Medium-time-scale (minutes to hours) radio transients are a relatively unexplored population. The wide field-of-view and high instantaneous sensitivity of instruments such as MeerKAT provides an opportunity to probe this class of sources, using image-plane detection techniques. The previous letter in this series describes our project and associate…
Revisiting the Suzaku spectrum of the Galactic SNR W 49B: Non-detection of iron K-shell charge-exchange emission and refined ejecta-mass ratios of iron-group elements
Sato, Toshiki; Sawada, Makoto; Maeda, Keiichi +1 more
The origin of the recombining plasma in several Galactic SNRs has been debated. A plausible mechanism would be a rapid cooling in the past, by either an adiabatic or a conductive process. A recent spectral study of W 49B reported a possible charge-exchange emission due to collisions between the shock-heated ejecta and cold clouds, which could be d…
ALMA observations of CO isotopologues towards six obscured post-asymptotic giant branch stars
Olofsson, H.; Sahai, R.; Sánchez Contreras, C. +13 more
Context. Low- and intermediate-mass stars evolve through the asymptotic giant branch (AGB) when an efficient mass-loss process removes a significant fraction of their initial mass. For most sources, this mass-loss process relies on the interplay between convection, stellar pulsations, and dust formation. However, predicting the mass-loss history o…