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Coronal hole picoflare jets are progenitors of both fast and Alfvénic slow solar wind
Livi, S.; Peter, H.; Chitta, L. P. +19 more
Solar wind, classified by its bulk speed and the Alfvénic nature of its fluctuations, generates the heliosphere. The elusive physical processes responsible for the generation of the different types of this wind are a topic of active debate. Recent observations reveal intermittent jets, with kinetic energy in the picoflare range, emerging from dark…
Disk-locking Regulates Stellar Rotation in Young Clusters: Insights from NGC 2264
Fang, Min; Li, Chengyuan; Bu, Yutian +1 more
Many young clusters possess extended main sequences, a phenomenon commonly ascribed to stellar rotation. However, the mechanism behind their very wide stellar rotation distributions remains unclear. A proposed explanation is that magnetic star–disk interaction can regulate stellar rotation, i.e., protostars with longer disk lifetimes will eventual…
The centimeter emission from planet-forming disks in Taurus
Pascucci, I.; Garufi, A.; Testi, L. +16 more
The last decade has witnessed remarkable advances in the characterization of the (sub-)millimeter emission from planet-forming disks. Conversely, the study of (sub-)centimeter emission has made more limited progress, to the point that only a few exceptional disk-bearing objects have been characterized in the centimeter regime. This work takes a br…
Multiwavelength Observations of a Jet Launch in Real Time from the Post-changing-look Active Galaxy 1ES 1927+654
Ingram, Adam; Cenko, S. Bradley; Ricci, Claudio +34 more
We present results from a high-cadence multiwavelength observational campaign of the enigmatic changing-look active galactic nucleus 1ES 1927+654 from 2022 May to 2024 April, coincident with an unprecedented radio flare (an increase in flux by a factor of ∼60 over a few months) and the emergence of a spatially resolved jet at 0.1–0.3 pc scales. Co…
Variable stars in the VVV globular clusters: III. RR Lyrae stars in the inner Galactic globular clusters
Carballo-Bello, Julio A.; Smith, Leigh C.; Minniti, Dante +13 more
Context. High reddening near the Galactic plane hampers observations and proper characterization of the globular clusters (GCs) located toward the inner regions of the Milky Way. Aims. The VISTA Variables in the Vía Láctea (VVV) survey observed the Galactic bulge and adjacent disk for several years, providing multi-epoch, near-infrared images for …
Possible contributions of two nearby blazars to the NGC 4151 neutrino hotspot
Barnier, S.; Inoue, Y.; Omeliukh, A.
Context. The origin of the high-energy astrophysical neutrinos discovered by IceCube remains unclear, with both blazars and Seyfert galaxies emerging as potential sources. Recently, the IceCube Collaboration reported a ∼3σ neutrino signal from the direction of the nearby Seyfert galaxy NGC 4151. However, two gamma-ray-loud BL Lac objects, 4FGL 121…
Fourier and Wavelet Analysis of Coronal Mass Ejections during Solar Cycles 23–25: Angular Widths and Latitudinal Distribution
Xu, Tingting; Deng, Linhua; Wan, Miao +6 more
Coronal mass ejections (CMEs), the large-scale eruptions of plasma and magnetic fields from the solar corona, play a critical role in space weather and solar–terrestrial interactions. Understanding the periodicities of CMEs is essential for predicting their occurrences and impacts, but their quasiperiodic variations in different cycles, at differe…
Dynamical Models of the Milky Way in Action Space with LAMOST DR8 and Gaia EDR3
Zhang, Xin; Mao, Shude; Chen, Xuelei +6 more
This work explores dynamical models of the Milky Way (MW) by analyzing a sample of 86,109 K giant stars selected through cross-matching the LAMOST DR8 and Gaia EDR3 surveys. Our earlier torus models of Q. Wang et al. did not include Gaia data, making them incompatible with the new sample's proper motion distributions. Here, we refine the construct…
Deep imaging of three accelerating stars using SHARK-NIR and LMIRCam at LBT
Ertel, S.; Barbato, D.; D'Orazi, V. +29 more
The combination of detection techniques enhances our ability to identify companions orbiting nearby stars. We employed high-contrast imaging to constrain mass and separation of possible companions responsible for the significant proper motion anomalies of the nearby stars HIP 11696, HIP 47110, and HIP 36277. These targets were observed using the L…
Magnetic-Induced Force Noise in LISA Pathfinder Free-Falling Test Masses
Mendes, L.; Russano, G.; Nofrarias, M. +76 more
LISA Pathfinder was a mission designed to test key technologies required for gravitational wave detection in space. Magnetically driven forces play a key role in the instrument sensitivity in the low-frequency regime, which corresponds to the measurement band of interest for future space-borne gravitational wave observatories. Magnetically induced…