Search Publications
Influence of selection criteria on the interpretation of rotational behaviour of wide-binary star systems
Cookson, S. A.
Binary star systems are expected to follow Newtonian dynamics similarly to planetary systems. However, reports have been made of wide binary systems with separations around 0.01 pc and larger, showing potential deviations from standard Newtonian motion. This phenomenon, suggestive of the flattening of galactic rotation curves, calls for closer ins…
The Galactic supernova remnant CTB 1: optical and X-ray emission analysis
Rosado, M.; Arias, L.; Reyes-Iturbide, J. +4 more
We present the kinematic results for the supernova remnant (SNR) CTB 1, obtained with the PUMA equipment of the 2.1-m telescope at San Pedro Mártir National Astronomical Observatory, Baja California, Mexico. The observations were made on the H α line using a Fabry-Perot interferometer. The kinematics derived from the Fabry-Perot velocity cubes all…
The Jiao Tong University Spectroscopic Telescope (JUST) Project
Zhang, Yong; Zhang, Jun; Liu, Chengze +28 more
The Jiao Tong University Spectroscopic Telescope (JUST) is a 4.4-meter f/6.0 segmented-mirror telescope dedicated to spectroscopic observations. The JUST primary mirror is composed of 18 hexagonal segments, each with a diameter of 1.1 m. JUST provides two Nasmyth platforms for placing science instruments. One Nasmyth focus fits a field of view of …
A Comprehensive Kinematic Model of the Large Magellanic Cloud Disk from Star Clusters and Field Stars using Gaia DR3: Tracing the Disk Characteristics, Rotation, Bar, and Outliers
Subramanian, S.; Subramaniam, A.; Dhanush, S. R.
The internal kinematics of the Large Magellanic Cloud (LMC) disk have been modeled by several studies using different tracers with varying coverage, resulting in a range of parameters. Here, we model the LMC disk using 1705 star clusters and field stars, based on a robust Markov Chain Monte Carlo method, using Gaia DR3 data. The dependency of the …
Magnetic fields in the outskirts of PSZ2 G096.88+24.18 from a depolarization analysis of radio relics
Vazza, F.; van Weeren, R. J.; Bonafede, A. +4 more
Context. Radio relics are diffuse, non-thermal radio sources present in a number of merging galaxy clusters. They are characterized by elongated arc-like shapes and highly polarized emission (up to ∼60%) at gigahertz frequencies, and are expected to trace shock waves in the cluster outskirts induced by galaxy cluster mergers. Their polarized emiss…
A new method of measuring Forbush decreases
Vršnak, B.; Dumbović, M.; Heber, B. +2 more
Context. Forbush decreases (FDs) are short-term depressions in the galactic cosmic ray (GCR) flux and one of the common signatures of coronal mass ejections (CMEs) in the heliosphere. They often show a two-step profile, the second one associated with the CME's magnetic structure. This second step can be described by the recently developed analytic…
A Coronal Mass Ejection Impacting Parker Solar Probe at 14 Solar Radii
Vourlidas, Angelos; Stenborg, Guillermo; Nieves-Chinchilla, Teresa +2 more
The relationship between CME properties in the corona and their interplanetary counterparts is not well understood. Until recently, a wide spatial gap existed between the two regions, which prevented us from disentangling the spatial and temporal evolution of CMEs. NASA's Parker Solar Probe (PSP) has imaged multiple CMEs since its launch in 2018, …
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Westerlund 1 and 2 Open Clusters Survey
Umana, G.; Bayo, A.; Robberto, M. +48 more
Context. With a mass exceeding several 104 M⊙ and a rich and dense population of massive stars, supermassive young star clusters represent the most massive star-forming environment that is dominated by the feedback from massive stars and gravitational interactions among stars.
Aims: In this paper we present the Extended …
Tianyu-Search for the Second Solar System and Explore the Dynamic Univers
Shi, X.; Yang, M.; Lin, J. +32 more
Giant planets like Jupiter and Saturn, play important roles in the formation and habitability of Earth-like planets. The detection of solar system analogs that have multiple cold giant planets is essential for our understanding of planet habitability and planet formation. Although transit surveys such as Kepler and Transiting Exoplanet Survey Sate…
Scalable, Advanced Machine Learning Based Approaches for Stellar Flare Identification: Application to TESS Short-cadence Data and Analysis of a New Flare Catalog
Apai, Dániel; Lin, Chia-Lung; Giampapa, Mark S. +1 more
We apply multialgorithm machine learning models to TESS 2 minute survey data from Sectors 1–72 to identify stellar flares. Models trained with deep neural network, random forest, and XGBoost algorithms utilize four flare light-curve characteristics as input features. Model performance is evaluated using the accuracy, precision, recall, and F …