Rebrightening in the Radio: Secondary Flares from Tidal Disruption Events AT2019ehz and AT2019eve

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   Tidal Disruption Events in Active Galactic Nuclei: Thermal Radiation and Jets

   Nimrod Tripto, Tsvi Piran, Julian Krolik · 2026 · High Energy Astrophysical Phenomena · AI summary available

   In short

   A radiation-MHD simulation shows that tidal debris striking an AGN disk drives super-Eddington accretion, asymmetric thermal emission, and magnetic-flux accumulation potentially sufficient to power some TDE jets.

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   Swift J1644+57 as an off-axis Jet

   Paz Beniamini, Tsvi Piran, Tatsuya Matsumoto · 2023 · High Energy Astrophysical Phenomena · cited 28 times · AI summary available

   Abstract

   One of the intriguing puzzles concerning Swift J1644+57, the first jetted tidal disruption event (TDE) discovered, is the constant increase in its jet energy, as implied by radio observations. During the first two hundred days the jet energy has increased by an order of magnitude. We suggest that the jet was viewed slightly off-axis. In this case, the apparent energy increase arises due to the slowing down of the jet and the corresponding broadening of its beaming cone. Using equipartition analysis, we infer an increasing jet energy as a larger region of the jet is observed. A simple off-axis model accounts nicely for the multi-wavelength radio observations, resolving this long-standing puzz…

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   Evidence of flare and coronal mass ejection-driven shock acceleration of relativistic protons on 21 November 2024

   M. Jarry, A. Papaioannou, G. Vasalos et al. · 2026 · Solar and Stellar Astrophysics · AI summary available

   In short

   The 21 November 2024 relativistic SEP event is best explained by an early flare-related particle population combined with CME-shock acceleration whose contribution varied with magnetic connectivity.

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   A magnetically heated slim disc-corona model for tidal disruption events

   Wei Chen, Chris Done, Erlin Qiao et al. · 2026 · High Energy Astrophysical Phenomena · AI summary available

   Abstract

   Tidal disruption events (TDEs) can reach super-Eddington luminosities near their peak. While their optical/UV emission may arise from multiple processes, X-rays are more likely to be produced by the innermost accretion flow close to the black hole, analogous to super-Eddington flows in stellar-mass X-ray binaries (XRBs) and active galactic nuclei (AGNs). Super-Eddington AGNs typically show disc-dominated spectra, with weak and steep coronae, while super-Eddington XRBs show a wider variety of spectral shapes. Here we explore disc-corona coupling in TDEs by developing a super-Eddington ($\dot{m}>1$: slim) disc model in which magnetic reconnection transfers some of the accretion power from the …

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   Particle re-acceleration and diffuse radio sources in the galaxy cluster Abell 1550

   T. Pasini, H. W. Edler, M. Brüggen et al. · 2022 · A&A 663, A105 (2022) · cited 6 times · AI summary available

   Abstract

   We study diffuse radio emission in the galaxy cluster A1550, with the aim of constraining particle re-acceleration in the intra-cluster medium. We exploit observations at four different frequencies: 54, 144, 400 and 1400 MHz. To complement our analysis, we make use of archival Chandra X-ray data. At all frequencies we detect an ultra-steep spectrum radio halo ($S_\nu \propto \nu^{-1.6}$) with an extent of 1.2 Mpc at 54 MHz. Its morphology follows the distribution of the thermal intra-cluster medium inferred from the Chandra observation. West of the centrally located head-tail radio galaxy, we detect a radio relic with projected extent of 500 kpc. From the relic, a 600 kpc long bridge departs…

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   Atmospheric Response to of an Active Region to new Small Flux Emergence

   D. L. Shelton, L. K. Harra, L. M. Green · 2014 · Solar and Stellar Astrophysics · cited 7 times · AI summary available

   Abstract

   We investigate the atmospheric response to a small emerging flux region (EFR) that occurred in the positive polarity of Active Region 11236 on 23 \,-\ 24 June 2011. Data from the \textit{Solar Dynamics Observatory's Atmopheric Imaging Assembly} (AIA), the \textit{Helioseismic and Magnetic Imager} (HMI) and Hinode's \textit{EUV imaging spectrometer} (EIS) are used to determine the atmospheric response to new flux emerging into a pre-existing active region. Brightenings are seen forming in the upper photosphere, chromosphere, and corona over the EFR's location whilst flux cancellation is observed in the photosphere. The impact of the flux emergence is far reaching, with new large-scale coronal…

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   Enhanced Detectability of Very-High-Energy Gamma Rays from Off-Axis Short Gamma-Ray Bursts: Impacts of Structured Jets and External Inverse-Compton Scattering

   Yuri Sato, Bing Theodore Zhang, Kohta Murase · 2026 · High Energy Astrophysical Phenomena · AI summary available

   Abstract

   The binary neutron star merger GW170817 established a direct link between gravitational waves and short gamma-ray bursts (sGRBs), whose afterglows are commonly interpreted as nonthermal emission from structured relativistic jets viewed off-axis. Some sGRBs exhibit extended or plateau X-ray emission, suggesting prolonged central-engine activity. These X-ray photons can serve as seed photons for external inverse-Compton (EIC) scattering by relativistic electrons in the jet, producing very-high-energy (VHE) gamma rays. However, how the angular structure of the jet affects the detectability of EIC emission remains insufficiently explored. Here, we investigate EIC emission from off-axis structure…

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   Frequent Optical Flares in an M-type Detached Eclipsing Binary TIC 349005337

   Xiao Zhou, Liying Zhu, Wei Hu et al. · 2026 · Solar and Stellar Astrophysics · AI summary available

   Abstract

   A comprehensive photometric and spectroscopic analysis of TIC 349005337, a highly active M-type detached eclipsing binary with an orbital period of 2.6079133 days, is presented utilizing high-cadence and long-term monitoring photometry from the Transiting Exoplanet Survey Satellite (TESS) and medium-resolution spectroscopy from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). By integrating radial velocity curves with light curves, we determined the fundamental physical parameters for both components. The system consists of an M-dwarf primary ($M_1 = 0.517 \pm 0.009 M_\odot$, $R_1 = 0.518 \pm 0.003 R_\odot$) and a fully convective secondary ($M_2 = 0.298 \pm 0.004 M_\o…