astro-ph papers | Gist.Science

The Challenge in Illuminating the Invisible: Constraining LyC Escape with Bayesian Modelling and Symbolic Regression

This study constrains the Lyman continuum escape fraction ( $f_{\rm esc}^{\rm LyC}$ ) for local galaxy analogues using a Bayesian SED fitting framework and symbolic regression, revealing a median escape fraction of 4% and establishing a new predictive relation between the UV $\beta$ -slope and $f_{\rm esc}^{\rm LyC}$ .

Amanda Stoffers, Sandro Tacchella, Charlotte Simmonds, Benjamin D. Johnson, Roberto MaiolinoTue, 10 Ma🔭 astro-ph

Testing the cosmological Euler equation: viscosity, equivalence principle, and gravity beyond general relativity

This paper extends the testing of the cosmological Euler equation by introducing a generalized observable for equivalence principle violations and a model-independent parameter for dark matter viscosity, demonstrating that future Stage-IV surveys like SKA2 can constrain the latter to a precision of approximately $10^{-7}$.

Ziyang Zheng, Malte Schneider, Luca AmendolaTue, 10 Ma🔭 astro-ph

Type Iax supernovae as a source of iron-rich silicate dust

This study models dust formation in Type Iax supernovae ejecta and concludes that, unlike typical Type Ia supernovae, this low-luminosity subclass is a significant producer of iron-rich silicate dust, potentially locking up a large fraction of iron in grains with a dust-to-ejecta mass ratio orders of magnitude higher.

Aman Kumar, Arkaprabha SarangiTue, 10 Ma🔭 astro-ph

Synchronisation of a tidal binary by inward orbital migration. The case of Pluto and Charon

This paper challenges the conventional view that Pluto-Charon's mutual synchronization resulted from tidal recession, instead proposing a capture scenario where Charon formed at a higher altitude and migrated inward, a process that explains the system's lack of tidal fractures and potential spin reversal while demonstrating that tidal dissipation was significantly lower than in recession models.

Michael Efroimsky, Michaela Walterova, Yeva Gevorgyan, Amirhossein Bagheri, Valeri V. Makarov, Amir KhanTue, 10 Ma🔭 astro-ph

Enhancing low energy reconstruction and classification in KM3NeT/ORCA with transformers

This paper proposes enhancing low-energy neutrino reconstruction and classification in the KM3NeT/ORCA telescope by utilizing transformer models with physics-informed attention masks to incorporate explicit detector and physical knowledge, thereby improving performance and cross-configuration fine-tuning capabilities.

Iván Mozún Mateo (on behalf of the KM3NeT collaboration)Tue, 10 Ma🔭 astro-ph

Astrometric view of companions in the inner dust cavities of protoplanetary disks

By analyzing Gaia astrometry in 98 transition disks, this study finds that while companions are detected in 32% of the sample, most are stellar-mass objects that cannot explain the inner dust cavities, suggesting that if companions are responsible for cavity formation, they are likely planetary-mass bodies residing at wider separations.

Miguel Vioque, Richard A. Booth, Enrico Ragusa, Álvaro Ribas, Nicolás T. Kurtovic, Giovanni P. Rosotti, Zephyr Penoyre, Stefano Facchini, Antonio Garufi, Carlo F. Manara, Nuria Huélamo, Andrew Winter, Sebastián Pérez, Myriam Benisty, Ignacio Mendigutía, Nicolás Cuello, Anna B. T. Penzlin, Alfred Castro-Ginard, Richard TeagueTue, 10 Ma🔭 astro-ph

Polarimetric and spectropolarimetric observations with FoReRo2: Instrument overview and standard star monitoring

This paper presents the description and characterization of the FoReRo2 instrument's polarimetric and spectropolarimetric capabilities at the Rozhen Observatory, including a statistical analysis of Serkowski's law parameters, an evaluation of standard star stability, and demonstration of its performance through observations of RS Oph, comet C/2019 Y4, and the symbiotic star Z And.

Yanko Nikolov, Galin Borisov, Stefano Bagnulo, Plamen Nikolov, Rumen Bogdanovski, Tanyu BonevTue, 10 Ma🔭 astro-ph

Apparent Phantom Crossing in Gauss-Bonnet Gravity

This paper proposes realistic models within scalar-Einstein-Gauss-Bonnet and ghost-free $f(\mathcal{G})$ gravity frameworks that explain recent DESI observations of an inverse phantom crossing in the dark energy equation of state, either through standard phantom crossing mechanisms or via an "apparent" crossing where dark matter density decreases more slowly due to coupling with the Gauss-Bonnet invariant, all while preserving energy conditions.

Shin'ichi Nojiri, Sergei D. Odintsov, V. K OikonomouTue, 10 Ma🔭 astro-ph

The frame-dragging vector potential on galaxy scales from Dark-Matter-only Newtonian $N$ -body simulations

Using Dark-Matter-only $N$ -body simulations from the IllustrisTNG project, this study computes the frame-dragging gravito-magnetic vector potential on galactic scales, finding it to be two orders of magnitude larger than perturbation theory predicts yet remaining a subdominant $0.1\% \sim 1\% $effect that does not significantly alter the non-linear dynamics of cosmic structures within the$ \Lambda$CDM model.

William Beordo, Marco Bruni, Cristian Barrera-Hinojosa, Mariateresa CrostaTue, 10 Ma🔭 astro-ph

Gravitational Noether-Ward identities for scalar field

This paper establishes that for Einstein's gravity coupled to a massive, non-minimally coupled quantum scalar field, each term in the equation of motion for metric perturbations and each necessary renormalization counterterm independently satisfies a Noether-Ward identity, ensuring the overall transversality of the equation regardless of the specific definition used for the metric perturbation.

Tomislav ProkopecTue, 10 Ma🔭 astro-ph

Cosmic Himalayas in CROCODILE : Probing the Extreme Quasar Overdensities by Count-in-Cells analysis and Nearest Neighbor Distribution

By analyzing the CROCODILE hydrodynamic simulation using count-in-cells and nearest-neighbor distribution methods, this study demonstrates that the extreme quasar overdensity known as the Cosmic Himalayas is a natural outcome of the Lambda CDM framework when non-Gaussian statistics are properly applied, thereby resolving the apparent tension caused by conventional Gaussian assumptions.

Yuto Kuwayama, Yongming Liang, Kentaro Nagamine, Yuri Oku, Daisuke Nishihama, Daisuke Toyouchi, Keita Fukushima, Hidenobu Yajima, Hyunbae Park, Masami OuchiTue, 10 Ma🔭 astro-ph

SN 2024abvb: A Type Icn Supernova in the Outskirts of its Host Galaxy

This paper presents multiband observations and hybrid modeling of SN 2024abvb, identifying it as a luminous Type Icn supernova with a low ejecta mass resulting from significant progenitor mass stripping, as evidenced by its early C II emission lines and lack of hydrogen or helium features.

Maokai Hu, Shengyu Yan, Xiaofeng Wang, Abdusamatjan Iskandar, Jujia Zhang, Liping Li, Ali Esamdin, Letian Wang, Lingzhi Wang, Alexei V. Filippenko, Thomas G. Brink, Liyang Chen, Ruifeng Huang, Lifan WangTue, 10 Ma🔭 astro-ph

Kerr-Newman-de Sitter black holes in $f(R)$ gravity with constant curvature: horizon structure and extremality

This paper presents a unified analytic treatment of Kerr-Newman-de Sitter black holes in constant-curvature $f(R)$ gravity, deriving closed-form expressions for horizon radii and extremality conditions to reveal non-universal bounds and unique ultra-extremal configurations that differ from general relativity.

Alikram N. Aliev, Göksel Daylan EsmerTue, 10 Ma🔭 astro-ph

Limits of vacuum-template subtraction for LISA massive black hole binary sources in realistic environments

This paper demonstrates that while gravitational wave dephasing caused by gas accretion in massive black hole binaries will likely bias the inference of other LISA signals due to imperfect vacuum-template subtraction, the resulting residual is unlikely to be confidently distinguished from instrumental noise as a stochastic signal.

Lorenz ZwickTue, 10 Ma🔭 astro-ph

Mathematical Anatomy of Neutrino Decoherence in Red Turbulence: A Fractional Calculus Approach

This paper establishes an exact non-Markovian framework for neutrino decoherence in red turbulent matter using Nakajima--Zwanzig projection and fractional calculus, deriving an analytical solution in terms of Mittag-Leffler functions that links flavor evolution to anomalous diffusion while addressing ultraviolet singularities via Hadamard finite parts.

Yiwei Bao, Andrea Addazi, Shuai ZhaTue, 10 Ma🔭 astro-ph

Euclid preparation. Galaxy power spectrum modelling in redshift space

This paper evaluates three redshift-space distortion models for Euclid's H $\alpha$ galaxy survey, finding that the velocity difference generator ( ${\rm VDG_ \infty}$ ) and BACCO emulator outperform the effective field theory (EFT) model by providing more accurate cosmological parameter constraints on small scales up to $k_{max} \approx 0.35 h\,Mpc^{-1}$ .

Little Red Dots and Supermassive Black Hole Seed Formation in Ultralight Dark Matter Halos

This paper proposes that supermassive black hole seeds form via monolithic collapse of gas confined by solitonic cores in ultralight dark matter halos, a mechanism that naturally explains the observed masses of early black holes and recent "little red dot" candidates without requiring external UV backgrounds.

Dongsu Bak, Jae-Weon LeeTue, 10 Ma🔭 astro-ph

New solution to the hyperon puzzle of neutron stars: Quantum many-body effects

This paper proposes a novel solution to the hyperon puzzle by using the Dyson-Schwinger equation approach to incorporate quantum many-body effects, resulting in a stiff equation of state that supports neutron stars up to 2.59 solar masses while suppressing rapid cooling mechanisms.

Hao-Fu Zhu, Guo-Zhu Liu, Xufen Wu, Ye-Fei YuanTue, 10 Ma🔭 astro-ph

Statistical Validation and Photometric Characterization of the Hot Jupiter Candidate TOI 7475.01

This paper statistically validates the TESS candidate TOI 7475.01 as a hot Jupiter with a 3.25-day period and a radius of approximately 1.18 Jupiter radii, based on a comprehensive photometric analysis that yields a negligible false positive probability.

Biel Escolà-RodrigoTue, 10 Ma🔭 astro-ph

Euclid preparation. Impact of galaxy intrinsic alignment modelling choices on Euclid 3x2pt cosmology

This paper evaluates intrinsic alignment (IA) modelling choices for the Euclid DR1 3x2pt analysis, demonstrating that the redshift-dependent TATT (zTATT) model offers the most flexible description of IA with comparable constraining power to simpler models, making it a well-motivated choice for mitigating systematic biases in cosmological parameter estimation.

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