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The Closest View of a Fast Coronal Mass Ejection: How Faulty Assumptions Near Perihelion Lead to Unrealistic Interpretations of PSP/WISPR Observations
Reeves, Katharine K.; Hess, Phillip; West, Matthew J. +3 more
We report on the closest view of a coronal mass ejection (CME) observed by the Parker Solar Probe (PSP)/ Wide-field Imager for Parker Solar PRobe (WISPR) instrument on 2022 September 5, when PSP was traversing from a distance of 15.3 to 13.5 R ⊙ from the Sun. The CME leading edge and an arc-shaped concave-up structure near the core were…
A z = 1.85 galaxy group in CEERS: Evolved, dustless, massive intra-halo light and a brightest group galaxy in the making
Papovich, Casey; Finkelstein, Steven L.; Pérez-González, Pablo G. +25 more
We present CEERS JWST/NIRCam imaging of a massive galaxy group at z = 1.85, to explore the early JWST view on massive group formation in the distant Universe. The group contains ≳16 members (including six spectroscopic confirmations) down to log10(M⋆/M⊙) = 8.5, including the brightest group galaxy (BGG) in the proc…
Discovery of delta Scuti variables in eclipsing binary systems II. Southern TESS field search
Kahraman Aliçavuş, F.; Aliçavuş, F.; Çoban, Ç. G. +3 more
The presence of pulsating stars in eclipsing binary systems (EBs) makes these objects significant since they allow us to investigate the stellar interior structure and evolution. Different types of pulsating stars could be found in EBs, such as δ Scuti variables. δ Scuti stars in EBs have been known for decades, and the increasing number of such s…
Spectroscopic follow-up of statistically selected extremely metal-poor star candidates from GALAH DR3
Spitler, Lee R.; Da Costa, G. S.; Buder, Sven +5 more
The advent of large-scale stellar spectroscopic surveys naturally leads to the implementation of machine learning techniques to isolate, for example, small sub-samples of potentially interesting stars from the full data set. A recent example is the application of the t-SNE statistical method to ~600 000 stellar spectra from the GALAH survey in ord…
Accelerated phase-mixing in the stellar halo due to a rotating bar
Vasiliev, Eugene; Belokurov, Vasily; Davies, Elliot Y. +1 more
In a galaxy merger, the stars tidally stripped from the satellite and accreted onto the host galaxy undergo phase-mixing and form finely grained structures in the phase space. However, these fragile structures may be destroyed in the subsequent galaxy evolution, in particular, by a rotating bar that appears well after the merger is completed. In t…
Multiwavelength study of NGC 1365: The obscured active nucleus and off-nuclear compact X-ray sources
Shalima, P.; Swain, Subhashree; Dewangan, Gulab Chand +2 more
We present a multiwavelength study of the active nucleus and the off-nuclear X-ray sources in the nearby spiral galaxy, NGC 1365 using three simultaneous UV/X-ray observations by AstroSat over a two months period and archival IR observations performed with Spitzer and Herschel. Utilizing the data from the Soft X-ray Telescope (SXT) onboard AstroSa…
New stellar velocity substructures from Gaia DR3 proper motions
McMillan, Paul J.; Hobbs, David; Mikkola, Daniel
Local stellar motions are expected, and have been shown, to include signatures of the Galaxy's past dynamical evolution. These are typically divided into the disc, which shows the dynamical effects of spiral arms and the bar, and the stellar halo, with structures thought to be debris from past mergers. We use Gaia Data Release 3 to select large sa…
PEARLS: Low Stellar Density Galaxies in the El Gordo Cluster Observed with JWST
Grogin, Norman A.; Koekemoer, Anton M.; Pirzkal, Nor +23 more
A full understanding of how unusually large ultradiffuse galaxies (UDGs) fit into our conventional theory of galaxy formation remains elusive, despite the large number of objects identified locally. A natural extension of UDG research is the study of similar galaxies at higher redshift to establish how their properties may evolve over time. Howeve…
A 2:1 Mean-motion Resonance Super-Jovian Pair Revealed by TESS, FEROS, and HARPS
Trifonov, Trifon; Henning, Thomas; Latham, David W. +24 more
We report the discovery of a super-Jovian 2:1 mean-motion resonance (MMR) pair around the G-type star TIC 279401253, whose dynamical architecture is a prospective benchmark for planet formation and orbital evolution analysis. The system was discovered thanks to a single-transit event recorded by the Transiting Exoplanet Survey Satellite mission, w…
Examining the Rotation Period Distribution of the 40 Myr Tucana-Horologium Association with TESS
Kiman, Rocio; Faherty, Jacqueline K.; Gagné, Jonathan +6 more
The Tucana-Horologium association (Tuc-Hor) is a 40 Myr old moving group in the southern sky. In this work, we measure the rotation periods of 313 Tuc-Hor objects with TESS light curves derived from TESS full-frame images and membership lists driven by Gaia EDR3 kinematics and known youth indicators. We recover a period for 81.4% of the sample and…