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Observational mapping of the mass discrepancy in eclipsing binaries: Selection of the sample and its photometric and spectroscopic properties
Bowman, Dominic M.; Tkachenko, Andrew; Gebruers, Sarah +4 more
Context. Eclipsing spectroscopic double-lined binaries are the prime source of precise and accurate measurements of masses and radii of stars. These measurements provide a stringent test for models of stellar evolution that are consistently reported to contain major shortcomings.
Aims: The mass discrepancy observed for eclipsing spectroscopic…
Hubble Space Telescope survey of Magellanic Cloud star clusters. Binaries among the split main sequences of NGC 1818, NGC 1850, and NGC 2164
Milone, A. P.; Cordoni, G.; Marino, A. F. +15 more
Nearly all star clusters younger than ~600 Myr exhibit extended main sequence turnoffs and split main sequences (MSs) in their color-magnitude diagrams. Works based on both photometry and spectroscopy have clearly demonstrated that the red MS is composed of fast-rotating stars, whereas blue-MS stars are slow rotators. Nevertheless, the mechanism r…
Retrieving stellar parameters and dynamics of AGB stars with Gaia parallax measurements and CO5BOLD RHD simulations
Chiavassa, A.; Uttenthaler, S.; Freytag, B. +2 more
Context. The complex dynamics of asymptotic giant branch (AGB) stars and the resulting stellar winds have a significant impact on the measurements of stellar parameters and amplify their uncertainties. Three-dimensional (3D) radiative hydrodynamic (RHD) simulations of convection suggest that convection-related structures at the surface of AGB star…
Nine new M dwarf planet candidates from TESS including five gas giants
Kunimoto, Michelle; Eschen, Yoshi Nike Emilia
We present the detection of nine new planet candidates orbiting M dwarfs, identified using an independent search and vetting pipeline applied to TESS Full-Frame Image data from Sectors 1 to 63. Our candidates include planets as small as 1.4 $\mathrm{ R}_{{\oplus }}$, with orbital periods up to 20 d. Among the nine new candidates, we identified fiv…
Physical properties of trans-Neptunian object (143707) 2003 UY117 derived from stellar occultation and photometric observations
Pallé, E.; Souami, D.; Alvarez-Candal, A. +49 more
Context. Trans-Neptunian objects (TNOs) are considered to be among the most primitive objects in our Solar System. Knowledge of their primary physical properties is essential for understanding their origin and the evolution of the outer Solar System. In this context, stellar occultations are a powerful and sensitive technique for studying these di…
Four new eclipsing accreting ultracompact white dwarf binaries found with the Zwicky Transient Facility
Drake, A. J.; Bloom, J. S.; Kulkarni, S. R. +10 more
Context. Accreting ultracompact white dwarf binaries contain a white dwarf that is accreting from a degenerate object. They have orbital periods shorter than 65 min.
Aims: We report the discovery and the orbital period of four new eclipsing accreting ultracompact white dwarf binaries found using the Zwicky Transient Facility (ZTF) and discuss…
Non-conventional approach for deriving the radial sizes of coronal mass ejections at different instances: discrepancies in the estimates between remote and in situ observations
Mishra, Wageesh; Agarwal, Anjali
Understanding the evolution of radial sizes and instantaneous expansion speeds of coronal mass ejections (CMEs) is crucial for assessing their impact duration on Earth's environment. We introduce a non-conventional approach to derive the CME's radial sizes and expansion speeds at different instances during its passage over a single-point in situ s…
A 9 Month Hubble Space Telescope Near-UV Survey of M87. II. A Strongly Enhanced Nova Rate near the Jet of M87
Shara, Michael M.; Sparks, William; Lessing, Alec M. +3 more
The 135 classical novae that we have discovered in M87 with two Hubble Space Telescope imaging surveys appear to be strongly concentrated along that galaxy's jet. Detailed simulations show that the likelihood that this distribution occurred by chance is of order 0.3%. The novae near the jet display outburst characteristics (peak luminosities, colo…
Revisiting the local interstellar radiation field using Gaia DR3
Bianchi, S.
Context. Dust grains in the interstellar medium are heated by the integrated radiation from stars in the Milky Way. Thus, knowledge of the local interstellar radiation field (LISRF) is necessary to interpret observations of dust emission in the infrared and constrain (some) properties of interstellar grains. The LISRF representation that is most w…
An empirical isochrone archive for nearby open clusters
Meingast, Stefan; Rottensteiner, Alena
Context. The ages of star clusters and co-moving stellar groups contain essential information about the Milky Way. Their special properties and placement throughout the galactic disk make them excellent tracers of galactic structure and key components to unlocking its star formation history. Yet, even though the importance of stellar population ag…