Search Publications
Identifying 46 New Open Cluster Candidates in Gaia EDR3 Using a Hybrid pyUPMASK and Random Forest Method
Wang, Feng; Li, Zhongmu; Chi, Huanbin +1 more
Open clusters (OCs) are regarded as tracers to understand stellar evolution theory and validate stellar models. In this study, we presented a robust approach to identifying OCs. A hybrid method consisting of pyUPMASK and the random forest (RF) algorithm is first used to remove field stars and determine more reliable members. An identification mode…
Reconnection-generated Plasma Flows in the Quasi-separatrix Layer in Localized Solar Corona
Srivastava, Abhishek K.; Kayshap, Pradeep; Pontin, David I. +8 more
Multiwavelength observations of the propagating disturbances (PDs), discovered by Atmospheric Imaging Assembly (AIA) on board Solar Dynamics Observatory (SDO), are analyzed to determine their driving mechanism and physical nature. Two magnetic strands in the localized corona are observed to approach and merge with each other, followed by the gener…
Chemodynamical Analysis of Metal-rich High-eccentricity Stars in the Milky Way's Disk
Beers, Timothy C.; Lee, Young Sun; An, Deokkeun +2 more
We present a chemodynamical analysis of 11,562 metal-rich, high-eccentricity halo-like main-sequence stars, which have been referred to as the Splash or Splashed Disk, selected from the Sloan Digital Sky Survey and Large Sky Area Multi-Object Fiber Spectroscopic Telescope. When divided into two groups, a low-[α/Fe] population (LAP) and a high-[α/F…
JWST Detects Neon Line Variability in a Protoplanetary Disk
Muzerolle Page, J.; Walter, F. M.; McClure, M. K. +6 more
We report the first detection of variability in the mid-infrared neon line emission of a protoplanetary disk by comparing a JWST Mid-InfraRed Instrument Medium Resolution Spectrometer spectrum of SZ Cha taken in 2023 with a Spitzer Infrared Spectrograph Short-High spectrum of this object from 2008. We measure the [Ne III]-to-[Ne II] line flux rati…
Variation in optical and infrared properties of galaxies in relation to their surface brightness
Boquien, M.; Małek, K.; Koda, J. +12 more
Although it is now recognized that low surface brightness galaxies (LSBs) constitute a large fraction of the number density of galaxies, many of their properties are still poorly known. Based on only a few studies, LSBs are often considered to be "dust poor", that is, with a very low amount of dust. For the first time, we use a large sample of LSB…
Exploring the effects of primordial non-Gaussianity at galactic scales
Famaey, Benoit; Ibata, Rodrigo; Stahl, Clément +2 more
While large scale primordial non-Gaussianity is strongly constrained by present-day data, there are no such constraints at Mpc scales. Here we investigate the effect of significant small-scale primordial non-Gaussianity on structure formation and the galaxy formation process with collisionless simulations: specifically, we explore four different t…
Global Morphology Distortion of the 2021 October 9 Coronal Mass Ejection from an Ellipsoid to a Concave Shape
He, Jiansen; Shen, Fang; Feng, Xueshang +9 more
This paper presents a study of a 2021 October 9 coronal mass ejection (CME) with multipoint imaging and in situ observations. We also simulate this CME from the Sun to Earth with a passive tracer to tag the CME's motion. The coronagraphic images show that the CME is observed as a full halo by SOHO and as a partial halo by STEREO-A. The heliospheri…
Resolved SPLASH Chemodynamics in Andromeda's PHAT Stellar Halo and Disk: On the Nature of the Inner Halo along the Major Axis
Williams, Benjamin F.; Gilbert, Karoline M.; Guhathakurta, Puragra +5 more
Stellar kinematics and metallicity are key to exploring formation scenarios for galactic disks and halos. In this work, we characterized the relationship between kinematics and photometric metallicity along the line of sight to M31's disk. We combined optical Hubble Space Telescope/Advanced Camera for Surveys photometry, from the Panchromatic Hubb…
Extended 3He-rich Time Periods Observed by Solar Orbiter: Magnetic Connectivity and Sources
Allen, R. C.; Ho, G. C.; Mason, G. M. +4 more
Observations of Solar Energetic Particles (SEPs) using the Suprathermal Ion Spectrograph (SIS), which is part of the Energetic Particle Detector suite on the Solar Orbiter mission, present an unprecedented opportunity to investigate the composition and evolution of SEPs in close proximity to the Sun. By analyzing data from the SIS instrument, we h…
Morphology of Solar Type II Bursts Caused by Shock Propagation through Turbulent and Inhomogeneous Coronal Plasma
Koval, Artem; Stanislavsky, Aleksander; Konovalenko, Aleksander +4 more
Type II solar bursts are radio signatures of shock waves in the solar corona driven by solar flares or coronal mass ejections (CMEs). Therefore, these bursts present complex spectral morphologies in solar dynamic spectra. Here, we report meter-decameter radio observations of a type II burst on 2014 July 25 made with the Ukrainian radio telescopes …