🔭 Category

astro-ph

1406 papers

Doppler imaging combined with high-cadence photometry. I. Revisiting the surface of a pre-main-sequence flare star

By combining high-resolution spectroscopy from the Seimei telescope with continuous TESS photometry, this study demonstrates that the integrated Doppler imaging and light curve inversion method significantly improves the accuracy of reconstructing surface spot distributions and flare origins on the pre-main-sequence star PW And, particularly resolving features at low latitudes and in the southern hemisphere that are poorly constrained by spectroscopy alone.

Sanghee Lee, Engin Bahar, Hakan Volkan Şenavcı + 11 more2026-03-04🔭 astro-ph

Detecting the signature of helium reionization through 3HeII 3.46cm line-intensity mapping

This paper evaluates the detectability of the 3.46 cm helium line for tracing helium reionization using hydrodynamical simulations and forecasts, concluding that while current facilities struggle to distinguish reionization scenarios due to signal faintness and instrumental noise, next-generation high-sensitivity surveys like PUMA could achieve meaningful constraints within reasonable integration times.

Benedetta Spina, Cristiano Porciani, Sarah E. I. Bosman + 4 more2026-03-04🔭 astro-ph

The Northern High Time Resolution Universe pulsar survey: II. Single-pulse search set-up and simulations

This paper presents a new single-pulse search pipeline and associated software toolkits (FRBfaker and RFIbye) for the northern High Time Resolution Universe survey, demonstrating its readiness for full data processing through FRB-mimicking simulations and the detection of known pulsars, a RRAT, and numerous new single-pulse candidates.

L. J. M. Houben, H. Falcke, L. G. Spitler + 5 more2026-03-04🔭 astro-ph

Wave Front Sensing demodulated at the difference frequency between two phase-modulation sidebands in a compound interferometer configuration for a gravitational-wave detector

This paper proposes and experimentally validates a novel "Phase-Modulated-sideband × Phase-Modulated-sideband Wave Front Sensing" (PMPMWFS) technique for gravitational-wave detectors, which demodulates signals at the difference frequency between two anti-resonant sidebands to effectively decouple Power Recycling Cavity and incident beam alignment from arm cavity signals, thereby enabling stable, multi-degree-of-freedom control.

Chiaki Hirose, Kenta Tanaka, Osamu Miyakawa + 1 more2026-03-04🔭 astro-ph

Revisiting model-independent constraints on spatial curvature and cosmic ladders calibration: updated and forecast analyses

This paper presents an updated model-independent analysis of spatial curvature and cosmic ladder calibration using DESY5, DESI, and cosmic chronometer data, finding a mild tension with a flat universe while forecasting that future surveys like LSST and Euclid could significantly improve constraints on key cosmological parameters and resolve the Hubble tension.

Arianna Favale, Adri� Gómez-Valent, Marina Migliaccio2026-03-04🔭 astro-ph

CH3_3OH and HCN in Interstellar Comet 3I/ATLAS Mapped with the ALMA Atacama Compact Array: Distinct Outgassing Behaviors and a Remarkably High CH3_3OH/HCN Production Rate Ratio

Using ALMA observations of interstellar comet 3I/ATLAS, researchers detected distinct outgassing behaviors between methanol and hydrogen cyanide, revealing a remarkably high CH3_3OH/HCN production rate ratio that ranks among the highest ever measured in comets and is surpassed only by the anomalous C/2016 R2.

Nathan X. Roth, Martin A. Cordiner, Dominique Bockelée-Morvan + 15 more2026-03-04🔭 astro-ph

Forecasting Constraint on Primordial Black Hole Properties with the CSST $3\times2$pt Analysis

This study forecasts that the upcoming Chinese Space Station Survey Telescope (CSST) will significantly constrain the properties of primordial black holes as dark matter candidates, achieving tight limits on the product of their fraction and mass (fPBHmPBHf_{\rm PBH}m_{\rm PBH}) and precise measurements of key cosmological parameters through a comprehensive $3\times2$pt analysis of galaxy clustering, weak lensing, and galaxy-galaxy lensing.

Dingao Hu, Yan Gong, Pengfei Su + 4 more2026-03-04🔭 astro-ph

Deep Neural Network-Based High-Precision Identification of Weak Stability Boundary Structures

This paper proposes a deep neural network-based method that overcomes the limitations of conventional techniques by achieving both high computational efficiency and identification precision (97.26–99.91%) for weak stability boundary structures, thereby facilitating their application in ballistic capture analysis and low-energy transfer construction.

Shuyue Fu, Ziqi Xu, Di Wu + 1 more2026-03-04🔭 astro-ph

A Black-Hole Envelope Interpretation for Cosmological Demographics of Little Red Dots

By applying the black-hole-envelope model to reanalyze the spectral energy distributions of approximately 400 Little Red Dots, this study demonstrates that interpreting these sources as accreting black holes shrouded in dense gas, rather than dust-reddened AGNs, resolves their puzzling spectral features and reconciles their cosmological demographics with the established evolution of black holes at z<5z<5.

Hiroya Umeda, Kohei Inayoshi, Yuichi Harikane + 1 more2026-03-04🔭 astro-ph

The GAPS programme at TNG LXX. HD 128717 B/Gaia-6 B: a long-period eccentric low-mass brown dwarf from astrometry and radial velocities

Using high-precision radial velocities from HARPS-N combined with Gaia DR3 astrometry, the GAPS programme confirmed that the companion HD 128717 B (Gaia-6 B) is a long-period, high-eccentricity brown dwarf with a mass of approximately 20 Jupiter masses, correcting a previously inaccurate orbital solution derived solely from Gaia data.

M. Pinamonti, A. Sozzetti, D. Barbato + 24 more2026-03-04🔭 astro-ph

On the magnetic field evolution of interplanetary coronal mass ejections from 0.07 to 5.4 au

This study utilizes an expanded catalog of 1976 interplanetary coronal mass ejection events observed from 0.07 to 5.4 au to demonstrate that their magnetic field evolution follows a single power law with an exponent of approximately -1.57, while revealing that a two-exponent multipole model is required to reconcile these interplanetary measurements with solar source field strengths.

Christian Möstl, Emma E. Davies, Eva Weiler + 8 more2026-03-04🔭 astro-ph

Chemical complexity in star formation induced by stellar feedback: cores shock-formed by the supernova remnant W44

This study presents the first detection of complex organic molecules and deuterated species in a shock-impacted clump at the interface of supernova remnant W44 and a molecular cloud, revealing chemical properties consistent with early-stage low-mass star formation that may preserve a chemical budget ultimately incorporated into planetary systems.

G. Cosentino, I. Jiménez-Serra, F. Fontani + 8 more2026-03-04🔭 astro-ph

Probing the Warm Dark Matter mass with [C II] intensity mapping

This paper forecasts the potential of [C II] line-intensity mapping surveys to constrain the mass of Warm Dark Matter particles, demonstrating that while current and near-future surveys can set lower limits on the particle mass, achieving competitive constraints comparable to other methods will require combining multiple redshifts and emission lines with advanced survey capabilities.

Elena Marcuzzo, Cristiano Porciani, Emilio Romano-Díaz + 3 more2026-03-04🔭 astro-ph

Looking into the faintEst WIth MUSE (LEWIS): on the nature of ultra-diffuse galaxies in the Hydra I cluster. V. Integrated stellar population properties

Using MUSE integral field spectroscopy, this study analyzes the stellar population properties of ultra-diffuse and low-surface brightness galaxies in the Hydra I cluster, revealing distinct formation pathways where most galaxies align with a puffed-up dwarf scenario while metal-richer inner galaxies suggest significant environmental influence.

Goran Doll, Chiara Buttitta, Enrichetta Iodice + 19 more2026-03-04🔭 astro-ph

Resolving dust and Lyα emission in a lensed galaxy at the epoch of reionization with JWST/CANUCS

Using high-resolution JWST observations of the strongly lensed galaxy HCM 6A at z=6.5676z=6.5676, this study reveals that feedback-driven multiphase interstellar medium structures and dust-cleared central clumps in young star-forming regions enable efficient Lyman-α\alpha escape despite moderate dust content during the epoch of reionization.

V. Markov, M. Bradač, V. Estrada-Carpenter + 20 more2026-03-04🔭 astro-ph

Exploring the origins of high-velocity features in SNe Ia with the spectral synthesis code TARDIS

Using the TARDIS radiative-transfer code combined with neural network emulation and MCMC inference, this study demonstrates that single high-velocity density enhancements cannot simultaneously reproduce the observed silicon and calcium high-velocity features in Type Ia supernovae, suggesting that current delayed- and double-detonation explosion models are incomplete.

Luke Harvey, Kate Maguire, Alexander Holas + 8 more2026-03-04🔭 astro-ph