173 papers
This paper reports the discovery and characterization of G1010, a compact hierarchical triple main-sequence star system identified through a combination of Gaia data, multi-epoch spectroscopy, and TESS light curve analysis, which initially appeared to host a massive compact object but was confirmed to consist of a primary star and an eclipsing inner binary.
This paper introduces XSNAP, a new open-source Python pipeline for standardized X-ray analysis of supernovae, and applies it to multi-epoch observations of SN 2024ggi to derive a steady progenitor mass-loss rate of .
Based on five years of spectropolarimetric monitoring, this study reports the first direct measurement of Polaris's rotation period (100.29 days) and reveals a remarkably stable surface magnetic field, providing critical constraints for understanding the star's unusual evolutionary history and potential merger origin.
This paper utilizes a modified conveyor belt model to demonstrate that standard surface density thresholds can misclassify early-stage high-mass clumps, revealing that the total cumulative mass accreted over time is the critical factor in distinguishing high-mass from intermediate-mass star-forming regions.
This study utilizes multi-spacecraft observations and numerical simulations to demonstrate that the widespread 28 October 2021 relativistic solar energetic particle event was governed by a narrow injection region coupled with efficient cross-field diffusion, resulting in parallel mean free paths within the Palmer consensus range and perpendicular mean free paths of approximately 1–10% of the parallel values.
This paper presents a novel analytical model demonstrating that direct mass transfer via a stream is inefficient at spinning up an accretor to critical rotation, thereby allowing the star to gain significant mass while remaining stable, with mass conservation being highest in tighter orbits or systems with faster donor rotation.
This study utilizes multi-view observations and a revised cone model to characterize the three-dimensional geometry and kinematics of two successive coronal mass ejections from active region 12994, revealing their large angular extents and propagation paths toward Mercury to improve future impact predictions for solar planets.
This paper reports the first on-sky demonstration of dual-field interferometry at the CHARA Array, which successfully resolved the inner Ba-Bb subsystem of Piscium to determine precise dynamical masses for the near-twin F-type stars and validated the facility's capability for sub-mas astrometry on arcsecond-scale binaries.
By extrapolating statistical relationships between flare ribbon areas and energy from modern observations to the largest recorded sunspot group (April 1947), this study empirically estimates that the Sun is capable of producing flares with bolometric energies reaching a few times 10^34 erg, comparable to superflares observed on other Sun-like stars.
This study uses 3D simulations of rotating hydrodynamic convection to demonstrate that thermal Rossby waves drive outward radial angular momentum transport at rapid rotation rates, revealing a significant discrepancy between these findings and the assumptions underlying current mean-field theories of solar differential rotation.
This study utilizes multi-wavelength SDO observations to track the six-month decay of solar active region NOAA AR 12738, revealing that a peripheral dimming region's continuous areal decrease is driven by a distinct thermal deficit in the 10–10 K range rather than merely a lack of plasma, thereby offering new insights into active region thermal evolution and magnetic restructuring.
This study utilizes rotational broadening measurements from LAMOST spectra to determine orbital inclinations and companion masses for ten compact object candidates, revealing five systems with unseen companions likely to be neutron stars or massive white dwarfs, including two potential Type Ia supernova progenitors.
This study validates a method for estimating circumsolar sky brightness by demonstrating quantitative agreement between direct coronagraphic measurements and aerosol-inferred radiance at Mauna Loa, thereby enabling multi-decadal analysis of daytime coronal observing conditions using AERONET data.
This paper analyzes a large sample of nova decline times to establish bidirectional power-law relationships between the and parameters, ultimately finding that is approximately half of within the derived uncertainties.
This study employs rotating stellar models with dynamically varying magnetic field strength and mixing-length parameters to successfully reproduce observed lithium abundances and general rotational trends in solar-type stars, though it currently overestimates the Sun's present-day rotation rate and magnetic field, highlighting the need for additional angular momentum loss mechanisms.
This paper presents new astrometric measurements for 13 nearby cold brown dwarfs using combined Spitzer and HST data, revealing significant intrinsic scatter in their photometric properties that renders distance estimates unreliable and underscores the necessity of direct parallax measurements for accurate characterization.
This paper demonstrates that the commonly used frequency range of for predicting solar-like oscillation detectability is suboptimal, and recommends adopting a narrower range of to maximize detection probabilities and yields for asteroseismic surveys.
This paper combines advanced stellar evolution and atmosphere modeling to predict the synthetic spectral characteristics of fast-rotating, very metal-poor massive stars, revealing a transition from early-O type giants/supergiants to WO-type spectral classes as they evolve, with the goal of validating these predictions against upcoming Hubble Space Telescope observations.
This study demonstrates that asteroseismic analysis of low-mass red giants, specifically through the comparison of seismic signatures like the diagnostic and ratios, provides a powerful method for distinguishing primordial, metal-free Population III stars from metal-enriched analogues despite surface pollution.
This paper presents new JWST mid-infrared detections of the nearby cold gas giant Ind Ab, combining them with three decades of astrometric data to precisely determine its dynamical mass and construct its first full 4–25 m spectral energy distribution, thereby establishing it as a benchmark system that validates evolutionary models for low-mass, old exoplanets.