Search Publications
Sun-as-a-star Observations of Obscuration Dimmings Caused by Filament Eruptions
Veronig, Astrid M.; Dissauer, Karin; Tian, Hui +1 more
Filament eruptions often lead to coronal mass ejections (CMEs) on the Sun and are one of the most energetic eruptive phenomena in the atmospheres of other late-type stars. However, the detection of filament eruptions and CMEs on stars beyond the solar system is challenging. Here, we present six filament eruption cases on the Sun and show that fila…
Flux Contribution and Geometry of Charge Exchange Emission in the Starburst Galaxy M82
Foster, Adam R.; Smith, Randall K.; Okon, Hiromichi +1 more
Recent X-ray studies of starburst galaxies have found that charge exchange (CX) commonly occurs between outflowing hot plasma and cold gas, possibly from swept-up clouds. However, the total CX flux and the regions where CX occurs have been poorly understood. We present an analysis of XMM-Newton observations of M82, a prototype starburst galaxy, ai…
X-Ray Variability in the Symbiotic Binary RT Cru: Principal Component Analysis
Luna, G. J. M.; Drake, J. J.; Danehkar, A.
Hard X-ray-emitting (δ-type) symbiotic binaries, which exhibit a strong hard X-ray excess, have posed a challenge to our understanding of accretion physics in degenerate dwarfs. RT Cru, which is a member of the δ-type symbiotics, shows stochastic X-ray variability. Timing analyses of X-ray observations from XMM-Newton and NuSTAR, which we consider…
"Beads-on-a-string" Star Formation Tied to One of the Most Powerful Active Galactic Nucleus Outbursts Observed in a Cool-core Galaxy Cluster
Baum, Stefi A.; O'Dea, Christopher P.; Vaddi, Sravani +19 more
With two central galaxies engaged in a major merger and a remarkable chain of 19 young stellar superclusters wound around them in projection, the galaxy cluster SDSS J1531+3414 (z = 0.335) offers an excellent laboratory to study the interplay between mergers, active galactic nucleus (AGN) feedback, and star formation. New Chandra X-ray imaging rev…
Toward Unveiling Cosmic Reionization: The Ionizing Photon Production Efficiency (ξ ion) of Low-mass Hα Emitters at z ∼ 2.3
Nakajima, Kimihiko; Spitler, Lee; Motohara, Kentaro +2 more
We investigate the galaxy properties of ∼400 low-mass (<109 M ⊙) Hα emitters (HAEs) at z ∼ 2.3 in the ZFOURGE survey. The selection of these HAEs is based on the excess in the observed K s broadband flux compared to the stellar continuum estimated from the best-fit spectral energy distribution. These low-mass …
JADES Ultrared Flattened Objects: Morphologies and Spatial Gradients in Color and Stellar Populations
Bunker, Andrew J.; Maiolino, Roberto; Willott, Chris +20 more
One of the more surprising findings after the first year of JWST observations is the large number of spatially extended galaxies (ultrared flattened objects, or UFOs) among the optically faint galaxy (OFG) population otherwise thought to be compact. Leveraging the depth and survey area of the JWST Advanced Deep Extragalactic Survey, we extend obse…
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…