Search Publications
A Type Ia Supernova near a Globular Cluster in the Early-type Galaxy NGC 5353
Bregman, Joel N.; Qu, Zhijie; Gnedin, Oleg Y. +1 more
No progenitor of a Type Ia supernova (SN Ia) is known, but in old-population early-type galaxies, one may find SNe Ia associated with globular clusters, yielding a population age and metallicity. It also provides insight into the formation path and the SN enhancement rate in globular clusters. We sought to find such associations and identified SN …
A New Tidal Stream Discovered in Gaia DR3
Tian, Hao; Liu, Chao; Xue, Xiang-Xiang +2 more
Thanks to the precise astrometric measurements of proper motions by the Gaia mission, a new tidal stellar stream has been discovered in the northern hemisphere. The distribution of star count shows that the stream is approximately 80° long and 1.°70 wide. Observations of 21 member stars, including 14 RR Lyrae stars, indicate that the stream has an…
Dynamics of Binary Planets within Star Clusters
Kokubo, Eiichiro; Zhu, Wei; Huang, Yukun
We develop analytical tools and perform three-body simulations to investigate the orbital evolution and dynamical stability of binary planets within star clusters. Our analytical results show that the orbital stability of a planetary-mass binary against passing stars is mainly related to its orbital period. Critical flybys, defined as stellar enco…
Using 3.4 µm Variability toward White Dwarfs as a Signpost of Remnant Planetary Systems
Hermes, J. J.; De, Kishalay; Kaiser, B. C. +3 more
Roughly 2% of white dwarfs harbor planetary debris disks detectable via infrared excesses, but only a few percent of these disks show a gaseous component, distinguished by their double-peaked emission at the near-infrared calcium triplet. Previous studies found that most debris disks around white dwarfs are variable at 3.4 and 4.5 µm, but th…
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 …
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, …
Self-similar Buildup and Inside-out Growth: Tracing the Evolution of Intermediate-to-high-mass Star-forming Galaxies since z = 2
Tacchella, Sandro; Mosleh, Moein; Hosseini-ShahiSavandi, S. Zahra +1 more
We aim to discern scenarios of structural evolution of intermediate-to-high-mass star-forming galaxies (SFGs) since cosmic noon by comparing their stellar mass profiles with present-day stellar masses of
The Age-dependent Vertical Actions of Young Stars in the Galaxy
Xiang, Maosheng; Rix, Hans-Walter; Zari, Eleonora +2 more
Stars in the Galactic disk are born on cold, nearly circular orbits with small vertical excursions. After their birth, their orbits evolve, driven by small- or large-scale perturbations in the Galactic disk's gravitational potential. Here, we study the vertical motions of young stars over their first few orbital periods, using a sample of OBA star…
The Molecular Exoskeleton of the Ring-like Planetary Nebula NGC 3132
Wilner, David J.; De Marco, Orsola; Kastner, Joel H. +4 more
We present Submillimeter Array (SMA) mapping of 12CO J = 2 → 1, 13CO J = 2 → 1, and CN N = 2 → 1 emission from the ring-like planetary nebula NGC 3132, one of the subjects of JWST Early Release Observation near-infrared imaging. The ∼5″ resolution SMA data demonstrate that the Southern Ring's main, bright, molecule-rich ring …
Multiwavelength Spectral Energy Distribution Analysis of X-Ray Selected Active Galactic Nuclei at z = 0.2–0.8 in the Stripe 82 Region
Ueda, Yoshihiro; Toba, Yoshiki; Li, Junyao +3 more
We perform a systematic, multiwavelength spectral energy distribution (SED) analysis of X-ray detected active galactic nuclei (AGNs) at z = 0.2–0.8 with Sloan Digital Sky Survey (SDSS) counterparts in the Stripe 82 region, consisting of 60 type 1 and 137 type 2 AGNs covering a 2–10 keV luminosity range of $41.6\lt \mathrm{log}\ {L}_{{\rm{x}}}\lt 4…