Search Publications
ZZ Tau IRS: a Low Mass UX Ori Type Star with Strong Wind
Lamzin, S. A.; Strakhov, I. A.; Safonov, B. S. +7 more
The results of photometric, polarimetric, and spectroscopic observations of the young star ZZ Tau IRS in the visible and near-infrared bands are presented. Against the continuum of an M spectral type star about 50 emission lines of allowed (H I, He I, Na I, S II) and forbidden (O I, O II, O III, N I, N II, S II, Ca II, Fe II, Ni II) transitions we…
The YMCA (Yes, Magellanic Clouds Again) survey: Probing the outer regions of the Magellanic system with VST
Cignoni, M.; Tosi, M.; Ripepi, V. +9 more
Context. The Magellanic Clouds (MCs) are the Milky Way's most massive dwarf satellites. As they also represent the closest pair of galaxies in an ongoing tidal interaction while simultaneously infalling into the Milky Way halo, they provide a unique opportunity to study in detail an ongoing three-body encounter. Aims. We present the YMCA (Yes, Mag…
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…
Strong Balmer break objects at z ∼ 7–10 uncovered with JWST
Schaerer, D.; Marques-Chaves, R.; Oesch, P. A. +4 more
We report the discovery of robust spectroscopically confirmed Balmer break (BB) galaxies and candidates, with secure spectroscopic redshifts 7.1 ≤ z ≤ 9.6, from publicly available James Webb Space Telescope (JWST) extra-galactic photometric and spectroscopic surveys. To achieve this, we used dedicated filters probing the BB and inspected the objec…
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…
Constraints on corona formation from an analysis of topographic rims and fracture annuli
Smrekar, Suzanne E.; Sabbeth, Leah; Carrington, Morgan A.
Coronae diameters defined by topographic rims, not fractures, are slightly larger. Most coronae have fracture annuli that overlap their topographic rims. Some corona models predict fractures interior to the topographic rims. There is little difference in the dimensions of rims with and without fractures. Fracture formation may be influenced by str…
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…
DART Impact Ejecta Plume Evolution: Implications for Dimorphos
Pajola, M.; Bertini, I.; Cremonese, G. +29 more
The NASA Double Asteroid Redirection Test (DART) spacecraft impacted the moon Dimorphos of the [65803] Didymos binary system and changed the binary orbit period, demonstrating asteroid deflection by a kinetic impact and indicating that more momentum was transferred to Dimorphos by escaping impact ejecta than was incident with DART. Images of the D…
The XMM-Newton Line Emission Analysis Program (X-LEAP). I. Emission-line Survey of O VII, O VIII, and Fe L-shell Transitions
Bregman, Joel N.; Liu, Jifeng; Qu, Zhijie +1 more
The XMM-Newton Line Emission Analysis Program (X-LEAP) is designed to study diffuse X-ray emissions from the Milky Way (MW) hot gas, as well as emissions from the foreground solar wind charge exchange (SWCX). This paper presents an all-sky survey of spectral feature intensities corresponding to the O VII, O VIII, and iron L-shell (Fe-L) emissions.…