Tuesday, 27 October 2026

138 new papers, 19 highlights. Written by qwen2.5:7b.

Cosmology (17 new)

• A study proposes an interacting scenario between dark energy (DE) and dark matter (DM) where DE emerges late in the universe. The analysis, using various cosmological probes, suggests a transfer of energy from DE to DM, affecting the Hubble constant and clustering parameters. This research could provide insights into the nature of dark energy and its interaction with dark matter. (2609.04990)
• LensFactory.jl is an open-source, efficient, and modular strong lensing modeling package for galaxy clusters. It supports single- and multi-plane lensing, and its validation on simulated and observed clusters shows promising results. The package also introduces singularity maps as a diagnostic tool for lens models. (2609.08649)
• A new study uses the observed abundance and spatial clustering of JWST's little red dots (LRDs) to challenge the primordial black hole (PBH) hypothesis. The results favor the standard halo formation picture over the PBH scenario, suggesting that LRDs form in virialized dark-matter halos rather than being seeded by PBHs. (2610.23806)

Galaxies (33 new)

• A study of star-forming and quiescent lenticular (S0) galaxies found that star-forming S0 galaxies (SFS0s) have intermediate HI mass fractions and HI deficiency compared to quiescent S0s and spiral galaxies, suggesting a unique transition phase in galaxy evolution. (2609.28030)
• The contact frontier in Galactic civilization networks, determined using an exponential stellar disc model, is set entirely by the disc scale length, providing insights into the spatial connectivity of potential extraterrestrial civilizations. (2610.20475)
• A study of quasars in the Cosmic Himalayas overdensity at z=2.16-2.20 found no significant offsets in rest-frame ultraviolet variability compared to quasars with similar properties, suggesting that environmental effects on AGN variability may be minimal. (2610.30570)
• Using JWST observations, researchers found a massive, radio-loud, Compton-thick AGN (el Ascua) at z~3.8, which was previously hidden by heavy dust, highlighting the importance of mid-infrared observations in uncovering obscured AGNs. (2610.33155)

High-energy astrophysics (30 new)

• The study of compact stars with a strong first-order phase transition to quark matter and an additional fluid of self-interacting bosonic dark matter (DM) reveals the presence of stable ultra-compact objects (UCOs) with a total compactness C = Mtot/Rgrav 1/3. The inclusion of DM changes the stability of mass-radius configurations, potentially leading to the formation of twin stars with a continuous stable mass-radius sequence after the onset of the phase transition to quark matter. (2609.03964)
• The XRISM/Resolve mission provides a new method to measure the effective viscosity of the intracluster medium (ICM) by analyzing the thickness of the viscous shear layer at cold fronts. For the prototypical cold front of A3667, the interface shows a line-of-sight velocity jump of 535 km/s across the front, completed within 100 seconds, indicating a kinematic viscosity of ν~ d2/(4T). (2609.04316)
• The search for the origin of ultrahigh-energy cosmic rays (UHECRs) can be extended by using two complementary energy-weighted metrics: the accumulated energy U and the local average energy per particle μE. These metrics can provide constraints on the sources of UHECRs if measured, potentially revealing localized spectral features that cannot be detected with directional excess searches alone. (2609.12174)
• The study of the X-ray transient EP251129a at z=0.505 reveals two X-ray plateaus: an early plateau lasting ~104 seconds followed by a rapid decay with spectral softening, and a second plateau extending to 60 days. The unusual radio afterglow shows a rapid rise of Fν t1.9-2.5 and a delayed peak at ~36-40 days, providing strong evidence for an off-axis geometry. (2610.34810)

Solar and stellar (28 new)

• A new method, DOFCAT, has been used to analyze the internal velocity dispersion of coronal mass ejections (CMEs) in the middle corona. The results show that the velocity profiles of both the CME front and core change with position angle and are non-uniform. (2609.25904)
• A study using a 32-day simulation based on a novel magnetohydrodynamic model quantifies the impact of background subtraction on the inferred large-scale structure and brightness of the solar corona, providing the first direct observational (2610.15895)
• The formation and evolution of active regions are analyzed using optical images and full-vector maps of magnetic fields. The study confirms that the formation of active regions and sunspots is primarily driven by the motion of solar plasma, not magnetic fields. (2610.30333)
• A study of Wolf-Rayet stars in the Triangulum Galaxy (M33) finds that ground-based fiber spectra blend each target with neighboring OB stars, diluting diagnostic emission-line equivalent widths and biasing spectral classifications, inferred mass-loss rates, and surface hydrogen abundances. (2610.33163)

Planets and the Solar System (16 new)

• The first selection of optimal targets for the Lazuli ExtraSolar Coronagraph's reflected starlight exoplanet campaign includes 27 known giant exoplanets, providing a comprehensive atmosphere characterization and synergies with future astrometric and radial velocity measurements. (2610.31286)

Instruments and methods (14 new)

• HEL1OS, the hard X-ray spectrometer on the Aditya-L1 solar mission, has been successfully commissioned and is now providing continuous monitoring of the Sun in the 8 keV to 150 keV energy range. The fully automated data pipeline processes the down-linked data to generate science-ready products, which are available with open access. (2609.01307)
• MACE is a comprehensive set of accurate Compton-scattering tables for multigroup, multiangle radiation-transport calculations. These tables, generated using a deterministic integration method, provide the radiation-transport community with precise and easily usable tools for modeling Compton scattering in various astrophysical scenarios. (2610.25117)
• A new tool, ocrrejectexam(), in the stistools Python package identifies datasets impacted by over-flagging of cosmic rays in Hubble Space Telescope's STIS instrument data. This tool can help in recalibrating impacted data, ensuring more accurate spectroscopic observations. (2610.33184)