1406 papers
Using 13 years of high-resolution SOPHIE spectroscopic data, this study identifies and characterizes distinct long-term magnetic activity cycles of approximately 4.8 and 4.9 years in the exoplanet-hosting M dwarfs GJ 617A and GJ 411, respectively, confirming their magnetic origin and distinguishing them from planetary signals to improve future exoplanet detection efforts.
This paper reports the detection of a high-energy neutrino flare from the Type IIn supernova SN~2017hcd with an isotropic energy far exceeding that of its ejecta, suggesting the emission likely originated from a choked jet rather than the standard ejecta–circumstellar medium interaction.
This study utilizes LAMOST spectroscopic data to calibrate chromospheric activity indices for over 11,000 solar-like stars, revealing that activity levels increase with rotation rate until reaching a saturation threshold that varies systematically with effective temperature and convective zone depth.
This paper investigates the quasinormal modes of a scalar field on a parity-violating rotating black hole background, deriving perturbative frequency corrections for low spins and revealing significant deviations from Kerr predictions in the near-extremal regime, thereby offering a new method to probe parity-violating gravity in strong gravitational fields.
This paper presents a transformer-based foundation model that leverages Gaia XP spectra and APOGEE data to simultaneously predict atmospheric parameters, mass, and age for evolved stars with high accuracy, demonstrating that data-driven approaches can effectively internalize stellar physics to overcome spectral degeneracies in Galactic archaeology.
This paper presents an autoencoder-based machine learning framework that effectively identifies anomalous stellar spectra, such as instrumental errors and rare carbon or oxygen-rich stars, within the MaNGA Stellar Library by leveraging reconstruction errors as anomaly scores.
This paper analyzes the evolution of time-lags and type-C QPOs in the black hole X-ray binary Swift J1727.8-1613 during its 2023 rising outburst, revealing a transition from hard to soft lags and strong correlations with QPO frequency and shock location that support the propagating oscillatory shock model of accretion dynamics.
This study integrates the size-resolved CARMA bin microphysics scheme into the CAM6 global climate model to simulate exoplanets across various rotation rates, revealing that while the native Morrison-Gettelman parameterization yields reasonable habitability assessments, the resolved microphysics significantly alters cloud properties and ice size distributions, which has critical implications for interpreting exoplanet transmission spectra.
This study utilizes complete spectroscopic samples from nine massive local galaxy clusters to characterize their stellar mass functions, revealing distinct shapes for quiescent and star-forming populations and identifying a significant excess of intermediate-mass galaxies compared to IllustrisTNG-300 simulations, thereby providing critical constraints for galaxy formation models in dense environments.
This paper presents a robust compressible APIC/FLIP method that combines conservative split resampling and adaptive APIC/PIC blending to eliminate particle depletion artifacts in long-time Richtmyer-Meshkov instability simulations while preserving vortex dynamics and matching reference Euler growth metrics.
This study reveals that minor mergers, supermassive black hole growth, and gas accretion-starvation balance are the primary drivers of scatter in the stellar mass-gas metallicity relation across cosmic environments, with their specific impacts varying significantly by redshift and environment, particularly showing dominant effects in galaxy nodes.
High-cadence TESS observations of the high-redshift quasar PKS 0805−07 reveal a statistically significant, transient optical quasi-periodic oscillation with a period of approximately 1.7 days, which is interpreted as likely arising from either a hotspot orbiting a supermassive black hole or magnetohydrodynamic instabilities within the relativistic jet.
Based on multifrequency radio and X-ray observations indicating a strong magnetic field and low plasma beta, this paper proposes that the accretion flow onto Sgr A* transitions from a convection-dominated regime at large scales to a supersonic wind above a small accretion disk near the event horizon.
This paper proposes and observationally constrains a novel "structure-induced" dark energy model, which links cosmic structure formation to dark energy evolution, demonstrating its viability as a solution to fine-tuning and coincidence problems while offering flexibility in addressing current cosmic tensions.
This paper introduces the galmex Python package to generate a comprehensive catalog of non-parametric morphological indices for DECaLS galaxies, demonstrating their effectiveness—particularly when combined with LightGBM machine learning—in reliably classifying spiral and elliptical galaxies for future southern hemisphere surveys.
This paper outlines the scientific objectives and observational methodology of the OPTIMus survey, which utilizes multi-wavelength data from optical, infrared, and millimeter telescopes to comprehensively characterize the complex interstellar medium surrounding young massive stars.
Using the largest sample to date from the MaNGA survey, this study identifies 147 galaxies with counter-rotating stellar disks, classifies them into distinct kinematic types to reveal their origins in gas accretion and evolutionary stages, and demonstrates that the impact of this accretion on galaxy evolution depends primarily on the abundance of pre-existing gas in their progenitors.
This paper introduces a novel modified-gradient (MG) method that employs an implicit projection to reformulate magnetic field gradients, thereby achieving exact divergence-free results with round-off precision in meshless magnetohydrodynamics and demonstrating superior performance over constrained-gradient techniques and the GIZMO code across various test cases.
This paper challenges the prevailing view that Saturn's rings are young by demonstrating that revised calculations of gravitational focusing and the inclusion of space weathering processes significantly extend the estimated exposure age to several billion years, thereby undermining the dust pollution argument as a definitive proof of the rings' youth.
Using Australia Telescope Compact Array observations across 1.1–3.1 GHz, this study characterizes the radio spectrum and magnetic field properties of supernova remnant G315.42.3, revealing a dominant turbulent magnetic field and uniform radio characteristics across regions with differing evolutionary stages to inform future SNR modeling.