astro-ph papers | Gist.Science

Disc Fragmentation. III. The need for a new paradigm for formation of planets within close binary systems

This paper proposes a new paradigm where planets in tight binary systems form concurrently with the secondary star via gravitational fragmentation of massive circumstellar discs, explaining the observed prevalence of gas giants over low-mass planets through a process where early-formed, massive fragments survive inward migration while lower-mass objects are typically ejected as free-floating planets.

Luyao Zhang, Sergei Nayakshin, Clement Baruteau + 2 more2026-03-04🔭 astro-ph

Mantle Convection and Nightside Volcanism on Lava World K2-141 b

This study utilizes 2D convection models to demonstrate that K2-141 b experiences asymmetric single-lid tectonics with continuous nightside volcanism capable of outgassing tens of bars of volatiles over a billion years, though the resulting thermal emission signals remain below current detection thresholds.

Tobias G. Meier, Claire Marie Guimond, Raymond T. Pierrehumbert + 13 more2026-03-04🔭 astro-ph

The Effect of Atmospheric Chemistry on the Optical Geometric Albedos of Hot Jupiters

By comparing observational data from multiple space telescopes with first-principles atmospheric models, this study reveals that sodium and water abundances are the primary drivers of hot Jupiter geometric albedos, while the presence of uncondensed titanium and vanadium oxides would produce albedos inconsistent with observations.

K. D. Jones, B. M. Morris, K. Heng2026-03-04🔭 astro-ph

Orbital Dynamics and Gravitational Wave Signatures of Extreme Mass Ratio Inspirals in Galactic Dark Matter Halos

This paper systematically investigates how Navarro-Frenk-White and Beta dark matter halo profiles influence the orbital dynamics and gravitational wave signatures of extreme mass ratio inspirals by modeling dynamical friction, accretion, and radiation reaction, revealing distinct long-term phase shifts and a unique energy flux cusp in the NFW model that could be detectable by future space-based observatories.

Guo-He Li, Chen-Kai Qiao, Jun Tao2026-03-04🔭 astro-ph

Alpha Cygni Variables as Seen from the Transiting Exoplanet Survey Satellite

This study analyzes 27-day TESS light curves for 75 southern Alpha Cygni variables to identify ten Deneb-like candidates for ground-based monitoring, characterize their positions on the Hertzsprung-Russell diagram, and evaluate the utility of different MAST data processing pipelines.

Joyce A. Guzik, Claire Whitley, Nova Moore + 2 more2026-03-04🔭 astro-ph

Water enrichment of forming sub-Neptune envelopes limited by oxygen exhaustion

This study demonstrates that water enrichment in forming sub-Neptune envelopes is fundamentally capped by the magma ocean's oxygen inventory, leading to hydrogen-dominated atmospheres unless additional mechanisms like late volatile delivery or giant impacts are invoked.

Tadahiro Kimura, Tim Lichtenberg2026-03-04🔭 astro-ph

Quantifying Element Importance for Mass Recovery from Population III Supernova Yield Fits

This study systematically quantifies the importance of specific elemental abundances in reconstructing the initial mass function of unobserved Population III stars, identifying C, N, Na, and K as the most critical elements for accurate progenitor mass recovery through stellar archaeology.

Zhongyuan Zhang, Alexander P Ji, Vinicius M Placco + 1 more2026-03-04🔭 astro-ph

The primordial nature of the C-19 stellar stream

Based on high-resolution spectroscopy of 14 member stars, this study reveals that the extremely metal-poor C-19 stellar stream originated from a single, rapid, and prolific early star formation event with mild chemical inhomogeneity, offering a unique window into primordial star formation in the early universe.

Kim A. Venn, Zhen Yuan, Nicolas F. Martin + 32 more2026-03-04🔭 astro-ph

The Cost of Circularity: Quantifying Eccentricity-Induced Biases in Binary Black Hole Inference

This study demonstrates that unmodeled orbital eccentricity in binary black hole mergers significantly biases inferred parameters—such as mass, spin, and distance—when analyzed with standard circular waveform models, particularly for systems with eccentricities above $e \sim 0.2$ , thereby establishing the critical thresholds where eccentric waveform models become essential for accurate astrophysical inference.

Tamal RoyChowdhury, V. Gayathri, Rossella Gamba + 3 more2026-03-04🔭 astro-ph

Effects of Resolution and Local Stability on Galactic Disks: 2. Halo Resolution and Softening on Bar Formation

This study uses N-body simulations to demonstrate that while dark matter halo resolution has a limited impact on bar formation in unstable disks, large gravitational softening suppresses bar growth by flattening the central density profile and hindering angular momentum transfer, while simultaneously exacerbating buckling instability through inhibited vertical heating.

S. Kwak, I. Minchev, M. Steinmetz + 1 more2026-03-04🔭 astro-ph

Evidence for a Delayed UV Counterpart to X-ray Quasi-periodic Eruptions in Ansky

This paper reports the first detection of a recurrent UV counterpart to X-ray quasi-periodic eruptions in the source Ansky, characterized by a systematic lag of approximately one day that challenges existing models to simultaneously explain the multi-wavelength signal, its time delay, and the source's increasing recurrence period.

Hengxiao Guo, Zhen Yan, Ya-Ping Li + 15 more2026-03-04🔭 astro-ph

Observational Properties of Near-Maximally Spinning Supermassive Black Holes

Despite theoretical differences between near-maximal spin parameters, general relativistic magnetohydrodynamics simulations and polarized ray-tracing reveal that accretion flows around black holes with spins of $a_\bullet=0.9375$ and $a_\bullet=0.998$ produce remarkably similar observational properties, suggesting that distinguishing between them will likely require space-based extensions of the Event Horizon Telescope to measure photon ring shape and size.

Tegan A. Thomas, Angelo Ricarte, Ben S. Prather + 1 more2026-03-04🔭 astro-ph

The solar-like latitudinal distribution of flaring activities revealed by TESS, APOGEE and GALAH

By analyzing approximately 27,000 flares from 1,510 stars observed by TESS, APOGEE, and GALAH, this study reveals that flaring activity is concentrated at low latitudes and shifts to higher mean latitudes as stellar rotation slows, indicating that flares originate from small-scale magnetic fields while large-scale polar fields remain inactive.

Huiqin Yang, Shuai Liu, Yang Huang + 2 more2026-03-04✓ Author reviewed ⓘ🔭 astro-ph

Mechanism for reduction of the afterpulsing rate of PMTs

This study demonstrates that the reduction of afterpulsing rates in Cherenkov Telescope Array PMTs, which had previously increased during storage, is driven by a mechanism requiring both light illumination and high-voltage operation that facilitates the ionization and subsequent trapping of residual gas ions at later dynodes.

Kai Morita, Mitsunari Takahashi, Habib Ahammad Mondal + 7 more2026-03-04🔭 astro-ph

An Adolescent and Near-Resonant Planetary System Near the End of Photoevaporation

This paper presents the characterization of the ~200-Myr-old TOI-2076 system, providing direct evidence that its four sub-Neptune planets are dynamically fragile near-resonant bodies undergoing early atmospheric reshaping via photoevaporation, which has stripped their inner envelopes while leaving outer ones more intact.

Mu-Tian Wang, Fei Dai, Hui-Gen Liu + 28 more2026-03-04🔭 astro-ph

A Tale of Two Origins: In-Situ versus Accreted Nitrogen-Rich Field Stars in the MW

By analyzing the chemodynamical properties of 33 nitrogen-rich field stars, this study confirms their globular cluster origins and distinguishes between those accreted from massive dwarf galaxies and those formed in situ, thereby demonstrating the potential of chemical peculiarities to trace the Milky Way's assembly history.

Yi Qiao, Baitian Tang, José G. Fernández-Trincado + 14 more2026-03-04🔭 astro-ph

Dynamics of planetary rings under thermal forces

This paper introduces the Eclipse-Yarkovsky effect, a thermal torque arising from asymmetric particle emission during planetary eclipses, and demonstrates through a continuum framework that it drives outward ring transport and can form sharp inner edges, while a competing planetary-Yarkovsky effect may cause inward migration in close-in rings.

Wen-Han Zhou, Eiichiro Kokubo, Harrison Agrusa + 5 more2026-03-04✓ Author reviewed ⓘ🔭 astro-ph

Polarity-Resolved Far-Side Magnetograms Based on Helioseismic Measurements

This paper presents a methodology for inferring magnetic polarities of far-side solar active regions using helioseismic signatures and Hales' law, thereby enabling the creation of polarity-resolved far-side magnetograms to improve full-Sun magnetic modeling and space-weather forecasting.

Amr Hamada, Kiran Jain, Hanna Strecker + 2 more2026-03-04🔭 astro-ph

The MUSE-Faint survey V. The binary fraction of Leo T

Using MUSE-Faint multi-epoch spectroscopy, this study presents the first measurement of the binary fraction in the Leo T dwarf galaxy, finding an overall rate of approximately 55% that varies with stellar age and metallicity but does not significantly inflate the galaxy's inferred velocity dispersion.

Daniel Vaz, Jarle Brinchmann, Sebastian Kamann + 3 more2026-03-04🔭 astro-ph

Transverse Oscillations and Wave Propagation in the Magnetically Dominated M87 Jet

Based on high-cadence KaVA 22 GHz observations, this study analyzes transverse oscillations in the M87 jet, identifying a $\sim$ 1-year period and superluminal wave speeds consistent with the bulk flow, suggesting the oscillations are likely driven by MHD waves from central engine activity or jet instabilities.

Hyunwook Ro, Motoki Kino, Kazuhiro Hada + 6 more2026-03-04🔭 astro-ph

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