astro-ph.GA papers | Gist.Science

Astro-Ph — Ga explores the dynamic life cycles of stars, from their fiery births in cosmic clouds to their dramatic endings as supernovae or quiet white dwarfs. This field deciphers the physics governing stellar structure, evolution, and the chemical elements they forge, offering a window into how the universe has transformed over billions of years. Researchers here analyze light and gravity to understand the machinery driving these celestial beacons.

At Gist.Science, we process every new preprint in this category directly from arXiv, ensuring you stay ahead of the curve. For each paper, we provide both a plain-language summary to grasp the big picture and a detailed technical breakdown for deep analysis. Below are the latest papers in stellar astrophysics, curated to help you navigate the newest discoveries with clarity.

🔭 astrophysics

The birth of the intracluster medium: the evolution of multiphase gas and Lyman- $\alpha$ haloes in a simulated $z\sim3$ protocluster

This study utilizes a high-resolution cosmological simulation of a $z\sim3$ protocluster to demonstrate how major mergers and AGN feedback drive an inside-out transformation from a filamentary, multiphase circumgalactic medium to a hot, X-ray emitting intracluster medium, while analyzing the resulting evolution of metal absorption lines and the transition from filamentary to spherical Lyman- $\alpha$ haloes.

Jake S. Bennett, Aaron Smith, Fabrizio Arrigoni-Battaia, Debora Sijacki, Cassandra Lochhaas, Lars Hernquist2026-07-17

🔭 astrophysics

Chemodynamical evidence of the HR 1614 moving group as a bar resonance

This study provides chemodynamical evidence that the HR 1614 moving group is not a dissolved star cluster but rather a resonant feature at the Milky Way's bar corotation, composed of a diverse mix of chemically distinct disk stars trapped by the bar's gravitational influence.

Andreas J. Koch-Hansen, Vladislav Gulaev, Dominik H. Plonka, Camilla Juul Hansen, Andrew McWilliam, Victor P. Debattista (…)2026-07-17

🔭 astrophysics

Efficient Interstellar Grain Growth from High Sticking Coefficients on Amorphous Carbon Dust

This paper demonstrates through molecular dynamics simulations and experimental validation that amorphous carbon dust grains exhibit high sticking coefficients for gas-phase atoms, confirming that accretion in the interstellar medium is an efficient mechanism for rapid dust growth on astrophysical timescales.

Clarke J. Esmerian, Duncan Bossion, Francois Dulieu, Saoud Baouche, Alexey Potapov, W. M. C. Sameera, Tom J. L. C. Bakx (…)2026-07-17

🔭 astrophysics

Accurate proper motions of the protostellar system VLA1623-2417

This study presents the first accurate absolute proper motions for the individual components of the quadruple protostellar system VLA1623-2417, revealing that component W is likely unbound or on a highly inclined orbit rather than being dynamically ejected, while the inner binary Aa/Ab shows significant orbital motion insufficient for mass determination.

Ricardo Hernández Garnica (IRyA-UNAM), Laurent Loinard (IRyA-UNAM, BHI-Harvard), Carlos Carrasco-González (IRyA-UNAM), J (…)2026-07-17

⚛️ high-energy theory

Revisiting Data Quality Control and Multiple-star Modeling in Wide Binary Gravity Tests: Confirmation of MOND-type Gravitational Anomaly at Low Acceleration

This paper confirms the existence of a MOND-type gravitational anomaly in wide binary stars at low accelerations by demonstrating that rigorous data quality control and realistic modeling of multiple-star systems cannot eliminate the observed deviation from standard gravity, attributing conflicting previous results to calibration biases, unaccounted selection effects, or insufficient statistics.

Kyu-Hyun Chae, Youngsub Yoon2026-07-17

🔭 astrophysics

Runaway OB stars within 1 kpc of the Sun

This study analyzes a volume-complete sample of OB stars within 1 kpc of the Sun to determine runaway star probabilities, finding that approximately 17.5% of O-type and 6.9% of B-type stars are runaways based on a fixed velocity threshold, a result consistent with previous research but influenced by sample selection and methodology.

Juan Martinez Garcia, Nicholas Wright, Alexis Quintana2026-07-17

🔭 astrophysics

Enabling Cosmic Web Analysis at Gigaparsec Scales: A Multi Block Approach for DisPerSE

This paper introduces a multi-block "frozen-core" method that overcomes DisPerSE's memory limitations to enable gigaparsec-scale cosmic web analysis, successfully reconstructing the global filament network of the MDPL2 simulation and confirming the theoretically predicted power-law mass-connectivity relation across three decades of halo mass.

Ankit Singh, Frazer Pearce, Meghan Gray, Gustavo Yepes2026-07-17

🔭 astrophysics

Discrepancies between Chandrasekhar's theory of relaxation and $N$ -body simulations

This paper demonstrates that while refined $N$ -body measurements reduce the previously claimed amplitude mismatch between Chandrasekhar's relaxation theory and simulations, a residual discrepancy dependent on position and anisotropy persists, suggesting that spatial inhomogeneities and collective effects are necessary to fully resolve the differences.

Kerwann Tep, Douglas C. Heggie2026-07-17

🔭 astrophysics

The Goldilocks Molecule: H $_{2}$ Emission Lines Can Identify Elusive Dwarf AGN

This paper proposes that H $_{2}$ emission line ratios serve as a novel and effective diagnostic tool for identifying elusive intermediate-mass black holes in dwarf AGN, particularly in high-density environments where traditional optical and near-infrared indicators fail.

Morgan Micharski, Chris Richardson2026-07-17

🔭 astrophysics

Stellar Multiplicity in Open Clusters: Investigating Binary Fractions and Their Relationship with Cluster Properties

By analyzing 773 open clusters, this study reveals that while binary fractions are largely independent of cluster age and evolution, they exhibit an anticorrelation with metallicity and show that binary systems are preferentially concentrated in cluster centers with mass ratios decreasing toward the outskirts, suggesting that multiplicity is primarily established during early formation rather than shaped by subsequent dynamical evolution.

Ruan P. Alves, Hektor Monteiro, Wilton S. Dias, Gabriel R. Hickel2026-07-17

astro-ph.GA

The birth of the intracluster medium: the evolution of multiphase gas and Lyman-α\alphaα haloes in a simulated z∼3z\sim3z∼3 protocluster

Chemodynamical evidence of the HR 1614 moving group as a bar resonance

Efficient Interstellar Grain Growth from High Sticking Coefficients on Amorphous Carbon Dust

Accurate proper motions of the protostellar system VLA1623-2417

Revisiting Data Quality Control and Multiple-star Modeling in Wide Binary Gravity Tests: Confirmation of MOND-type Gravitational Anomaly at Low Acceleration

Runaway OB stars within 1 kpc of the Sun

Enabling Cosmic Web Analysis at Gigaparsec Scales: A Multi Block Approach for DisPerSE

Discrepancies between Chandrasekhar's theory of relaxation and NNN-body simulations

The Goldilocks Molecule: H2_{2}2​ Emission Lines Can Identify Elusive Dwarf AGN

Stellar Multiplicity in Open Clusters: Investigating Binary Fractions and Their Relationship with Cluster Properties

The birth of the intracluster medium: the evolution of multiphase gas and Lyman- $\alpha$ haloes in a simulated $z\sim3$ protocluster

Discrepancies between Chandrasekhar's theory of relaxation and $N$ -body simulations

The Goldilocks Molecule: H $_{2}$ Emission Lines Can Identify Elusive Dwarf AGN