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Localizing short-period pulsations in hard X-rays and γ-rays during an X9.0 flare
Li, Dong
Context. The feature of quasi-periodic pulsations (QPPs) is frequently observed in the light curve of solar and stellar flares. However, the short-period QPP is rarely reported in the high energy range of hard X-rays (HXRs) and γ-rays. Aims. We investigated the QPP at a shorter period of about 1 s in high-energy channels of HXRs and γ-ray continuu…
The cosmological analysis of X-ray cluster surveys: VI. Inference based on analytically simulated observable diagrams
Pierre, M.; Werner, N.; Kosiba, M. +4 more
Context. The number density of galaxy clusters across mass and redshift has been established as a powerful cosmological probe, yielding important information on the matter components of the Universe. Cosmological analyses with galaxy clusters traditionally employ scaling relations, which are empirical relationships between cluster masses and their…
Development and Evolution of Icy Layer Outcrops on Mars' North Polar Ice Cap: Observations of Vertical and Lateral Variability
Mustard, John F.; Becerra, Patricio; Bramson, Ali M. +1 more
Mars' north polar ice cap features troughs that cut into the ice, exposing subsurface layers of different brightness and topographic expression. Specifically, these layers represent two different stratum types: lower albedo (higher dust content) marker beds, which protrude out of the wall topographically, and higher albedo (i.e., icier) interbeds,…
Unveiling the Origins and Dynamics of the Hierarchical Triple Star System CN Lyn
Bakış, Volkan; Bilir, Selçuk; Alan, Neslihan +3 more
In this study, we present a detailed analysis of CN Lyn, an overlooked triple star system, by combining spectroscopic data from the literature, photometric Transiting Exoplanet Survey Satellite data, and kinematic techniques. We updated the fundamental parameters of the known eclipsing components in the system with high precision. The chemical com…
Direct N-body simulations of NGC 6397 and its tidal tails
Baumgardt, Holger; Arnold, Anthony D.
We have performed a series of direct N-body simulations that study the evolution of the Galactic globular cluster NGC 6397 under the combined influence of two-body relaxation, stellar evolution, and the Milky Way's tidal field. Our simulations follow the evolution of the cluster over the last several Gyr up to its present-day position in the Milky…
Metallicity Dependence of Giant Planets around M Dwarfs
Burgasser, Adam J.; Gan, Tianjun; Mao, Shude +2 more
We investigate the stellar metallicity ([Fe/H] and [M/H]) dependence of giant planets around M dwarfs by comparing the metallicity distribution of 746 field M dwarfs without known giant planets with a sample of 22 M dwarfs hosting confirmed giant planets. All metallicity measurements are homogeneously obtained through the same methodology based on…
A study of the frequency and characteristics of stellar companions and Jupiter-like planets in nearby open clusters
Barbato, D.; D'Orazi, V.; Nascimbeni, V. +9 more
Context. Observations of companions of solar-type stars in nearby young moving groups (NYMGs) show that they split into two groups: stellar and brown dwarf companions (mass ratio q > 0.05) and Jupiter-like (JL) planets (q < 0.02). The frequency of JL planets in NYMGs appears to be higher than that obtained from radial velocity (RV) surveys. …
Behind the dust veil: A panchromatic view of an optically dark galaxy at z = 4.82
Koekemoer, Anton M.; Daddi, Emanuele; Schinnerer, Eva +30 more
Optically dark dusty star-forming galaxies (DSFGs) play an essential role in massive galaxy formation at early cosmic time; however, their nature remains elusive. Here, we present a detailed case study of all the baryonic components of a z = 4.821 DSFG, XS55. Selected from the ultra-deep COSMOS-XS 3 GHz map with a red SCUBA-2 450 µm/850 &mic…
TESS Hunt for Young and Maturing Exoplanets (THYME). XII. A Young Mini-Neptune on the Upper Edge of the Radius Valley in the Hyades Cluster
Vanderburg, Andrew; Quinn, Samuel N.; Howell, Steve B. +19 more
We present the discovery and characterization of TOI-4364b, a young mini-Neptune in the tidal tails of the Hyades cluster, identified through TESS transit observations and ground-based follow-up photometry. The planet orbits a bright M dwarf (K = 9.1 mag) at a distance of 44 pc, with an orbital period of 5.42 days and an equilibrium temperature of…
Multiple Populations of the Large Magellanic Cloud Globular Cluster NGC 2257: No Major Environmental Effect on the Formation of Multiple Populations of Old Globular Clusters in the Large Magellanic Cloud
Kim, Hwihyun; Kim, Hak-Sub; Lee, Jae-Woo +3 more
How the environment of the host galaxy affects the formation of multiple populations (MPs) in globular clusters (GCs) is one of the outstanding questions in near-field cosmology. To understand the true nature of the old GC MPs in the Large Magellanic Cloud (LMC), we study the Ca–CN–CH photometry of the old metal-poor LMC GC NGC 2257. We find the p…