Papers nuevos de Espacio y cosmos
En los últimos 3 días aparecieron 122 papers nuevos de Espacio y cosmos. Pipette los leyó todos y estos son los 60 con más interés, avance real y afirmaciones prudentes. Cada uno muestra la oración de su resumen que dice el resultado principal, tal como la escribieron sus autores.
Lo mejor de los últimos 3 días
JWST Observations of the Metal-poor T Dwarf WISEA J155349.96+693355.2: The First Brown Dwarf Associated with the Gaia-Enceladus Milky Way Substructure
The UVW kinematics of WISEA J155349.96+693355.2, its bulk metallicity, and its modest alpha enrichment ([/Fe] = +0.15 dex) are all equivalent to stars identified in the Gaia-Enceladus Milky Way substructure, making it the first brown dwarf with kinematic and chemical evidence of association.
PreprintDice ser un gran avanceDKIST unveils MHD-predicted sub-50 km photospheric vortices
These results demonstrate the unique capability of DKIST to resolve the population of photospheric convective vortices predicted by state-of-the-art magnetoconvection simulations, opening a new observational window into small-scale solar convective dynamics.
PreprintDice ser un gran avanceEnceladus-like geochemistry fuels methanogenesis under extreme CO 2 limitation
Here, we show that simulated Enceladus’ ocean chemistry containing high concentrations of dissolved inorganic carbon and H 2 from mineral-water reactions enables growth of the chemolithoautotroph H 2 -oxidizing methanogen Methanothermococcus okinawensis until pH 11, far exceeding its previously known pH limit.
Revista con revisión por paresMetal-poor Brown Dwarf Kinematics from JWST NIRSpec Spectroscopy
Our study systematically demonstrates that JWST G395H spectroscopy can provide robust RVs in addition to detailed chemical abundances, necessary for Galactic archaeology studies.
PreprintDice ser un gran avanceCoronal Green-Line Emission During a Solar Prominence Eruption: Spectroscopic Evidence of Its Correspondence with the EUV Late Phase
To our knowledge, this study provides the first space-based spectroscopic evidence linking coronal green-line emission with the ELP and its origin during a solar flare.
PreprintDice ser un gran avance3D Radiation Hydrodynamics of Blue Supergiant Envelopes
We present the first 3D radiation hydrodynamical simulation of the outer envelope of a blue supergiant.
PreprintDice ser un gran avancePAHSPECS: JWST/MIRI Spectroscopy of PAHs at Cosmic Noon
We present the PAH Spectroscopic Survey (PAHSPECS) JWST program, the first MIRI/MRS survey of the 3.3, 6.2, 7.7, 8.6 and 11.3m PAH features in MS galaxies at z~1.
PreprintDice ser un gran avanceThe quest for high-redshift radio galaxies II. Discovery of the most powerful known radio galaxy at z=4.946
This result makes this source the most powerful radio galaxy currently known.
PreprintDice ser un gran avanceMapping the Milky Way in Six Dimensions: A contiguous, homogenised, phase-space catalogue of Gaia DR3 tracers up to 250 kpc
We present a comprehensive, homogenised catalogue of stellar sources with full 6D phase-space information, spanning Galactocentric distances from the inner galaxy ( kpc) to the outer halo ( kpc).
PreprintEarly metal-enriched baryon cycling before the midpoint of cosmic reionization
Here we show that metal-enriched gas in multiple ionic phases was already present around galaxies before the midpoint of cosmic reionization.
Revista con revisión por paresCassini CDA observes compositional segregation of Enceladus’ ice grains from slow freezing and fragmentation of oceanic spray
Here, we present an analysis on the basis of ≈1000 mass spectra of individual Type 3 E ring ice grains recorded by Cassini’s Cosmic Dust Analyzer (CDA), revealing a large compositional diversity among these grains.
Revista con revisión por paresA Practical Primer on Software Citation in Research
We describe a seven-step workflow for citing software and a five-step workflow for making your software citeable, along with the community tools and resources that support each step.
PreprintFácil de leerDETECT: Real-Time Identification of Transients with DESI Spectroscopic Redshift
We present DETECT (DESI--Transient Event Cross-matching Tool), a pipeline that turns each Transient Name Server (TNS) alert into a distance-informed candidate within an hour by placing it in the context of the Dark Energy Spectroscopic Instrument (DESI) archive.
PreprintBinary-pulsar Timing: A 3D Solar-System Accelerometer and Unknown-Source Probe
Using the binary-pulsar timing measurements, we develop an analysis framework that combines the line-of-sight differential accelerations of 26 binary pulsars to jointly reconstruct the three-dimensional acceleration of the SSB and place directional upper limits.
PreprintQuantum Phase Transitions in Nuclei and the Origin of Rhodium
Here we show that the enhancement found in the solar system of rhodium and ruthenium isotopes compared to neighboring isotopes can serve as such a feature.
PreprintAstroGenesis: A Domain-Specific Multi-Agent AI for Astrophysical Research
We introduce AstroGenesis (https://astrogenai.com), a domain-specific multi-agent AI framework that integrates literature retrieval, multiwavelength data access and analysis, theoretical modeling, and research ideation within a unified research environment.The current implementation focuses on blazar research, with specialized agents coordinated by a Supervisor Agent and Planner/Replanner architecture.
PreprintCERIDWEN: Fast and Flexible GPU-Accelerated Stellar Population Inference
We present CERIDWEN, a GPU-native SED fitting framework written in JAX, with an end-to-end differentiable forward model spanning stellar populations, nebular emission, dust attenuation and emission, and projection into the observer frame.
PreprintCódigo disponibleDisc-mediated angular momentum transport resolves the mass-gain problem in rotating binaries
We introduce a disc-mediated angular momentum transport prescription for mass-transfer onto stellar companions.
PreprintConstraining the Quadratic-mode Amplitude Coupling in GW250114
The inferred coefficient is consistent with predictions from numerical relativity fits and second-order perturbation theory; no comparison shows a deviation exceeding .
PreprintA Census of Stellar-mass Black Holes in the Milky Way with POPKIN. I. Isolated Black Holes
We present POPKIN, a Python framework that couples single- and binary-star evolution with Galactic orbital dynamics to trace black-hole progenitors from the zero-age main sequence to the present-day isolated black-hole (IBH) population.
PreprintDeep HST/STIS Coronagraphic Imaging of the Pictoris Debris Disk: On the Scattered Light Component of the Cat's Tail
We report the detection of the visible/near-infrared scattered light component of the Cat's Tail substructure.
PreprintMagmatic origin of the Dewar magnetic anomaly: Implications for an early lunar dynamo
These findings link a magnetic anomaly to its geologic origin and magnetizing field, providing constraints on the lunar magnetic and volcanic history.
Revista con revisión por paresMulti-messenger and multi-band signal from first-order phase transitions in proto-neutron stars
Using a constrained ensemble of model-agnostic equations of state, we follow the accretion-driven evolution of proto-neutron stars through the PT and compute the resulting multi-band GW signal.
PreprintSouth Pole-Aitken basin sample Return and eXploration (SPARX) Science Definition Team Report
Convened by NASA in response to OWL Decadal Survey recommendations, the SPARX report provides analysis on prioritized science objectives, measurement requirements, implementation architectures, and a design reference mission for a South Pole-Aitken basin sample return mission.
PreprintAfirmaciones fuertes, leer con cuidadoTesting cosmic acceleration from thermogravity without vacuum energy
The resulting model, which can be thought of as a one parameter extension of , provides an improved fit relative to for the background dataset combinations considered, with improvements reaching and a maximum Bayesian preference of .
PreprintThe physics of deep-interior convective shell boundaries in a massive pre-supernova star: Internal gravity wave mixing at the peak
Our simulations show that the dominant physics at this boundary is mixing due to internal gravity waves.
PreprintAfirmaciones fuertes, leer con cuidadoNucleosynthetic constraints on the origin of Bennu and CI-like asteroids
These results demonstrate that CI-like bodies accreted from a common dust reservoir with affinities to both inner (noncarbonaceous) and outer (carbonaceous) Solar System materials.
Revista con revisión por paresAfirmaciones fuertes, leer con cuidadoCondensates: A Bridge to Quantum Gravity
The way out runs through condensed matter physics: laboratory tests of generalized uncertainty relations, analog systems, and --- most provocatively --- frameworks in which spacetime itself is a condensate.
PreprintAfirmaciones fuertes, leer con cuidadoA Collisional Origin for Ice-rich Iapetus and Titan's Anomalous Eccentricity
These results establish the collisional production of an icy debris reservoir, with some material on orbits of large semimajor axis; raising Iapetus's periapse would require gas drag or dynamical friction.
PreprintDynamically Stable Magnetic Fields in Relativistic Neutron Stars: A Diverse Landscape of GRMHD Equilibria
Our findings demonstrate that there is memory of the magnetic-field initial conditions, and that there is no unique dynamically stable magnetic-field geometry for neutron stars.
PreprintSpatial segregation as the origin of anisotropic satellite quenching in haloes and beyond
Here we use the SIMBA, TNG100, EAGLE, and feedback-free SIMBA cosmological simulations at to show that this satellite anisotropy primarily originates from spatial segregation between quenched and unquenched populations.
PreprintAfirmaciones fuertes, leer con cuidadoBreaking the Blend: A multi-tracer kinematic decomposition method for IFS data applied to disentangling the AGN outflow and circumnuclear ring in NGC 5728 with JWST
We present a new framework for decomposing IFS data into distinct components on a spaxel-by-spaxel basis using a multi-tracer, stacked kinematics approach.
PreprintAfirmaciones fuertes, leer con cuidadoMass-Dependent Dark Matter Deficit from Inelastic Scattering
We show that this mass dependence can arise from exothermic inelastic dark matter with strongly velocity-dependent scattering.
PreprintProbing the Metallicity Dependence of Fast Radio Burst Progenitors with CHIME/FRB Outrigger Dwarf Host Galaxies
We measure their gas-phase metallicities and, when combined with hosts from the literature, finding that repeating and non-repeating FRBs have statistically distinct metallicity distributions.
PreprintSimulating the thermodynamics of gas, radiation, and multispecies dust: Method and applications to protoplanetary disks
With this motivation, we have devised a radiation-hydrodynamics scheme for the PLUTO code with energy exchange (via absorption, emission, and collisions) for gas, radiation, and multiple species of dust.
PreprintThe JWST and ALMA view of local dwarf Pox 186: Evidence of stripped binaries driving a hard radiation field and little cold molecular gas resulting in high star-formation efficiency
This analysis strongly suggests that star formation rather than active galactic nuclei drives the hard radiation field observed in Pox 186, and cautions against relying solely on the UV diagnostics to establish the nature of high-z galaxies.
PreprintJust a Phase? Weakening Vertical Shear Instability Explains Class II Disk Morphologies: Simulations with dust coagulation, sedimentation, thermal relaxation, and backreaction
We present simulations of protoplanetary disks with VSI that are consistent with the observed thin-disk geometries, while maintaining the commonly observed bowl-shaped morphology in scattered light images at micrometer wavelength.
PreprintAfirmaciones fuertes, leer con cuidadoCanonical Quantization and Constraint Algebra of Weyl-Invariant Gravity in a Conformal Gauge: Emergence of a Geometric Cosmological Term
From a pure conformal symmetry principle, the model delivers an effective geometric cosmological term that drives the accelerated expansion with , providing the missing action principle for CMaDE.
Preprint con versión publicadaAfirmaciones fuertes, leer con cuidadoOn the Long-Term Orbital Behaviour of Hilda Asteroids - I. Global Stability Patterns and Catalogue
We present the results of detailed dynamical integrations of 2,699 numbered asteroids in the Hilda region, following 243 clones of each Hilda for 1 Gyr under the influence of the giant planets and the Sun; 54.7% of our sample exhibit extreme dynamical stability, with all clones of 1,475 Hildas remaining trapped in the 3:2 MMR for the full 1 Gyr of our integrations.
PreprintA Possible Complication of Using the 4.14 {\mu}m band to Assess D/H Ratios on Icy Bodies
While we suspect that existing methods could still determine the D/H ratio from a surface composed entirely of crystalline H2O-ice, deriving it for surfaces with a significant amorphous fraction may lead to severe underestimation of the true D/H ratio.
PreprintSimultaneous PSF Matching via Dual Kernel Optimization
In this paper, we present a new algorithm, Dual Kernel Optimization (DKO), that simultaneously solves for two convolution kernels, one for each image, such that the PSFs match and the sizes of the kernels are minimized.
PreprintCódigo disponibleTriggering star formation by free-floating planets
A sufficiently massive planet can become an alternative dynamic center for the contracting cloud.
PreprintAfirmaciones fuertes, leer con cuidadoGalaxy And Mass Assembly (GAMA): The Most Isolated GAMA Galaxies
Given the lack of significant interactions for the isolated sample, this implies that the evolution of present-day star-forming galaxies in all environments (at least outside rich clusters) has been, and remains, dominated by internal processes.
PreprintComposition-dependent acceleration of UHE Cosmic Rays in AGN electric fields
Within the scenarios tested, the results favour a relatively proton-poor accelerated population and show that the shower-width evolution can constrain the stochastic structure of electric-field acceleration in nearby AGN.
PreprintStellar Collisions from Self-consistent Stellar Dynamics Around Growing Supermassive black Holes
Our results highlight a crucial synergy between stellar dynamics and MBH growth, identifying massive galaxies as prime targets for observing transients from destructive stellar collisions.
PreprintExoplanet Detection Techniques: Radial Velocity
This chapter serves as a comprehensive guide for understanding the capabilities and applications of the radial velocity method, equipping readers with the knowledge and resources to address their own scientific questions using this technique.
PreprintLearning Inspiral-Merger-Ringdown Waveforms from a Post-Newtonian Baseline
Our results demonstrate a machine learning driven waveform modeling strategy in which numerical relativity augments, rather than replaces, analytically known waveform structure.
PreprintThe geometric origin of the thermal eccentricity law
We obtain , so that, within this family, is the only case for which the distribution function is linear in .
PreprintDiscovery of an isolated RELHIC Candidate: J1351+0039
We report the discovery of J1351+0039, a new isolated dark galaxy candidate identified through a blind HI survey with the Five-hundred-meter Aperture Spherical radio Telescope (FAST), combined with deep optical imaging from the DESI Legacy Survey.
PreprintVLTI/MATISSE observations of the hot dust around Pictoris: Observing faint objects with MATISSE
Conclusions: For beta Pictoris, the two-decade-old paradigm placing hot exozodiacal dust near the sublimation radius and consisting of submicron-sized grains finds observational support in the detailed analysis of MATISSE data.
Preprint con versión publicadaStudy of Chromospheric Global-Scale Flows using Local Correlation Tracking Across the past 10 Solar Cycles
These results extend the observational context for solar-cycle-related flows over a century and motivate further refinement through data-driven reconstruction.
PreprintAGN winds and outflows: from accretion-disc scales to the host galaxy
Building on the pioneering XRISM results, NewAthena's X-ray Integral Field Unit (X-IFU) will characterise the physical properties and energetics of accretion-disc winds with unprecedented precision from the local Universe up to cosmic noon, while complementary multi-wavelength observations with facilities such as the Extremely Large Telescope (ELT), James Webb Space Telescope (JWST), Atacama Large Millimeter/submillimeter Array (ALMA), and Square Kilometre Array (SKA) will determine whether and how their energy and momentum are transferred to the host galaxy.
PreprintNovel higher-dimensional regular black holes in general relativity coupled to nonlinear electrodynamics
We present a formalism for constructing higher-dimensional regular black holes in general relativity coupled to nonlinear electrodynamics, and propose a new class of electrically charged solutions that unifies the Bardeen and Hayward models in a single analytic form valid for any .
PreprintHow Magnetic Fields Regulate Cooling and Mixing in Turbulent Radiative Mixing Layers
Magnetic fields therefore strongly regulate cooling and mixing in multiphase gas, and quantitative predictions require careful treatment of transport processes.
PreprintUber-calibration-based Two-level Radial-velocity Zero-point Correction for APOGEE
We infer and remove these zero points directly from the published per-visit RVs using an uber-calibration framework based on shared repeat observations.
PreprintA Multiwavelength View of Oph II: Disentangling the Variability of the Multi-Star Component C
Taken as a whole, the multi-epoch and -wavelength data presents a consistent picture of Oph C as a rare trinary system composed of a hot star and two cool stars.
PreprintStatistics of large-scale structure from the transition probability of Lagrangian trajectories
Working purely in configuration space, we show that the two-point function can be formulated in terms of a transition probability describing the likely final position of a particle given its initial position.
PreprintJoint Model-independent Constraints on the Post-Newtonian Parameter and Cosmic Curvature from Galaxy-scale Strong Lensing, SNe Ia, BAO, and Cosmic Chronometers
Our results show that gamma PPN = 1.119 (+0.072/-0.072) and Omega k = 0.101 (+0.077/-0.076) at 68% confidence.
PreprintPSFSim: PhySics First Simulations for the Point Spread Function of the Roman Space Telescope
We present a new tool for generating simulated point spread functions (PSFs) in the Wide Field Instrument (WFI) of the Nancy Grace Roman Space Telescope.
PreprintExternal photoevaporation in the center of Tr14
The pronounced decline in the disk fraction with ambient FUV flux provides strong evidence for external photoevaporation rapidly dispersing circumstellar disks in the core of Trumpler 14.
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