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Goodbye to Chi by Eye: A Bayesian Analysis of Photometric Binaries in Six Open Clusters
von Hippel, Ted; Motherway, Erin; Geller, Aaron M. +2 more
We present a robust methodology for identifying photometric binaries in star clusters. Using Gaia DR3, Pan-STARRS, and Two Micron All Sky Survey data, we self-consistently define the cluster parameters and binary demographics for the open clusters (OCs) NGC 2168 (M35), NGC 7789, NGC 6819, NGC 2682 (M67), NGC 188, and NGC 6791. These clusters span …
Long term variability of Cygnus X-1. VIII. A spectral-timing look at low energies with NICER
Ingram, Adam; Steiner, James F.; Grinberg, Victoria +19 more
The Neutron Star Interior Composition Explorer (NICER) monitoring campaign of Cyg X-1 allows us to study its spectral-timing behavior at energies < 1 keV across all states. The hard state power spectrum can be decomposed into two main broad Lorentzians with a transition at around 1 Hz. The lower-frequency Lorentzian is the dominant component at…
A3COSMOS: Dust mass function and dust mass density at 0.5 < z < 6
Magnelli, B.; Pozzi, F.; Feltre, A. +7 more
Context. Although dust in galaxies represents only a few percent of the total baryonic mass, it plays a crucial role in the physical processes occurring in galaxies. Studying the dust content of galaxies, particularly at high z, is therefore crucial for understanding the link between dust production, obscured star formation, and the build-up of ga…
The most stringent upper limit set on the mass of a central black hole in 47 Tucanae using dynamical models
Dalessandro, E.; Giunchi, E.; Cignoni, M. +3 more
Globular clusters (GCs) have been proposed as promising sites for discovering intermediate-mass black holes (IMBHs), offering the possibility to gain crucial insights into the formation and evolution of these elusive objects. The Galactic GC 47 Tucanae (also known as NGC 104) has been suggested as a potential IMBH host, yet previous studies have y…
TEMPLATES: Direct Abundance Constraints for Two Lensed Lyman-break Galaxies
Hutchison, Taylor A.; Mahler, Guillaume; Rigby, Jane R. +20 more
Using integrated spectra for two gravitationally lensed galaxies from the JWST TEMPLATES Early Release Science program, we analyze faint auroral lines, which provide direct measurements of the gas-phase chemical abundance. For the brighter galaxy, SGAS1723+34 (z = 1.3293), we detect the [O III] λ4363, [S III] λ6312, and [O II] λ λ7320, 7330 aurora…
A new kinematic model of the Galaxy: analysis of the stellar velocity field from Gaia Data Release 3
Lattanzi, M. G.; Re Fiorentin, P.; Bucciarelli, B. +4 more
This work presents the results of a kinematic analysis of the Galaxy that uses a new model as applied to the newest available Gaia data. We carry out the Taylor decomposition of the velocity field up to second order for 18 million high luminosity stars (i.e. OBAF-type stars, giants, and subgiants) from the Gaia DR3 data. We determine the component…
Ultraviolet and Chromospheric Activity and Habitability of M Stars
Huang, Yang; Liu, Jifeng; Wang, Song +4 more
M-type stars are crucial for stellar activity studies because they cover two types of magnetic dynamos and are particularly intriguing for habitability studies due to their abundance and long lifespans during the main-sequence stage. In this paper, we used the LAMOST DR9 catalog and the GALEX UV archive data to investigate the chromospheric and UV…
TOI-5005 b: A super-Neptune in the savanna near the ridge
Bouchy, F.; Winn, J. N.; Moya, A. +38 more
Context. The Neptunian desert and savanna have recently been found to be separated by a ridge, an overdensity of planets in the period range of ≃3–5 days. These features are thought to be shaped by dynamical and atmospheric processes. However, their roles are not yet well understood. Aims. Our aim was to confirm and characterize the super-Neptune …
Determining Cosmological-model-independent H 0 with Gravitationally Lensed Supernova Refsdal
Li, Xiaolei; Liao, Kai
The reappearance of supernova Refsdal with detailed modeling of the lens cluster allows us to measure the time-delay distance, which serves as a powerful tool to determine the Hubble constant (H 0). We give a cosmological-model-independent method to estimate H 0 through Gaussian process regression, using time-delay measuremen…
Stellar Models are Reliable at Low Metallicity: An Asteroseismic Age for the Ancient Very Metal-poor Star KIC 8144907
Li, Yaguang; Huber, Daniel; Ong, J. M. Joel +15 more
Very-metal-poor stars ([Fe/H] < ‑2) are important laboratories for testing stellar models and reconstructing the formation history of our galaxy. Asteroseismology is a powerful tool to probe stellar interiors and measure ages, but few asteroseismic detections are known in very-metal-poor stars and none have allowed detailed modeling of oscillat…