🔭 Category

astro-ph

1092 papers

Backlighting young stellar objects in the Central Molecular Zone: an ensemble-averaged abundance structure of methanol ices

By combining L-band spectra of 15 backlit young stellar objects in the Central Molecular Zone with multi-wavelength data, this study reveals an ensemble-averaged methanol ice abundance profile that is systematically lower than in the Galactic disk and increases from the inner to outer envelope regions, likely due to the sublimation of methanol ice caused by intense heating from massive protostars.

Yewon Kang, Deokkeun An, Jiwon Han + 5 more2026-03-04🔭 astro-ph

Weak lensing of bright standard sirens: prospects for σ8σ_8

This paper demonstrates that incorporating weak lensing into bright standard siren analyses enables the measurement of the matter perturbation parameter σ8\sigma_8, with future observatories like the Einstein Telescope and LISA potentially achieving 10% and 30% accuracy, respectively, given sufficient populations of neutron star and massive black hole binaries with electromagnetic counterparts.

Ville Vaskonen2026-03-04🔭 astro-ph

MUSE-ALMA Haloes XIII. Molecular gas in z∼0.5z \sim 0.5 HI-selected galaxies

The MUSE-ALMA Haloes survey significantly expands the sample of HI-selected galaxies at z∼0.5z \sim 0.5 by doubling the number of CO detections, revealing a dual star formation efficiency where low-mass systems follow main-sequence relations while high-mass systems exhibit suppressed activity, thereby offering crucial insights into the baryon census and galaxy evolution at this redshift.

Victoria Bollo, Celine Peroux, Martin Zwaan + 11 more2026-03-04🔭 astro-ph

The drastic impact of Eddington-limit induced mass ejections on massive star populations

This study introduces a physically motivated mass-loss prescription for Eddington-limit induced ejections in 1D stellar evolution codes, demonstrating that incorporating this mechanism into single and binary models successfully reconciles theoretical predictions with observed massive star populations in the Magellanic Clouds, including their luminosity limits, evolutionary stages, and binary fractions.

D. Pauli, N. Langer, A. Schootemeijer + 6 more2026-03-04🔭 astro-ph

Numerical Insights into Disk Accretion, Eccentricity, and Kinematics in the Class 0 phase

Using 3D radiative magnetohydrodynamic simulations of collapsing cores, this study demonstrates that anisotropic, streamer-fed accretion driven by magnetic fields and turbulence not only facilitates rapid disk spreading but also continuously generates and sustains significant eccentricity (e∼0.1e\sim 0.1) in Class 0 protoplanetary disks, with profound implications for planet formation and cosmochemistry.

Adnan Ali Ahmad, Benoît Commerçon, Elliot Lynch + 4 more2026-03-04🔭 astro-ph

A comparative test of different pressure profile models in clusters of galaxies using recent ACT data

Using a stacked sample of 3,496 galaxy clusters from ACT-DR4 and DR6 data, this study demonstrates that while four different pressure profile models (gNFW, β\beta-model, polytropic, and exponential) fit the observed Sunyaev-Zel'dovich signals equally well, residual trends and scatter prevent the assumption of a truly universal pressure profile, particularly for high-precision applications.

Denis Tramonte2026-03-04🔭 astro-ph

Spatially Resolved Star Formation relations in local LIRGs along the complete merger sequence

This study utilizes ALMA and HST observations to reveal that while unresolved beam-sized analyses of 27 local LIRGs suggest a dual star formation relation, resolving individual molecular gas clumps uncovers a single, universal trend where star formation efficiency increases and becomes self-gravity regulated as mergers progress from early to late stages.

M. Sánchez-García, T. Díaz-Santos, L. Barcos-Muñoz + 25 more2026-03-04🔭 astro-ph

Molecular gas and star formation in central rings across nearby galaxies

Using high-resolution CO(2-1) observations from PHANGS-ALMA, this study characterizes the molecular gas content and star formation rates of 20 central rings in nearby galaxies, revealing that while their absolute properties vary with host galaxy characteristics, their relative contributions to global gas and star formation closely resemble those of the Milky Way's Central Molecular Zone, suggesting universal physical processes govern these structures.

Damian R. Gleis, Sophia K. Stuber, Eva Schinnerer + 20 more2026-03-04🔭 astro-ph

Interior dynamics of envelopes around disk-embedded planets

Using three-dimensional hydrodynamical simulations, this study reveals that the thermal balance between heating and cooling in disk-embedded planets creates three distinct envelope regimes, where intermediate cooling rates form a radiative layer that traps volatiles while slow cooling in inner disks leads to fully convective envelopes that stall super-Earth growth and deplete volatiles.

Ayumu Kuwahara, Michiel Lambrechts2026-03-04🔭 astro-ph

Revisiting the exoplanet radius valley with host stars from SWEET-Cat

By re-examining 1,405 exoplanets orbiting 1,221 stars with high-precision parameters from SWEET-Cat, this study confirms the existence of the radius valley and reveals its dependence on period, flux, stellar mass, and age, providing evidence that supports a core-powered atmospheric mass loss scenario while highlighting the need for improved stellar characterizations in future missions like PLATO.

Juma Kamulali, Vardan Adibekyan, Benard Nsamba + 7 more2026-03-04🔭 astro-ph

Tidal capture and repeating partial tidal disruption events of giant stars

This study uses hydrodynamic simulations to demonstrate that, unlike main-sequence stars, giant stars undergoing deep partial tidal disruption events are captured by supermassive black holes due to energy loss driven by asymmetric mass loss from their compact cores, a process that enables repeating partial tidal disruption events and influences extreme mass ratio inspiral evolution.

Di Wang, Fa-Yin Wang2026-03-04🔭 astro-ph

Timescales diagnostics for saving viscous and MHD-driven dusty discs from external photoevaporation

This study uses 1D simulations to demonstrate that while MHD-driven discs experience less photoevaporative erosion due to limited radial spreading, their overall lifetimes are comparable to viscous discs, with the survival of dust crucial for planet formation ultimately determined by the interplay between radial spreading, inward drift, and external FUV erosion strength.

Gabriele Pichierri, Giovanni Rosotti, Rossella Anania + 1 more2026-03-04🔭 astro-ph

The long quest for vacuum birefringence in magnetars: 1E 1547.0-5408 and the elusive smoking gun

Although a deep IXPE observation of magnetar 1E 1547.0-5408 revealed high X-ray polarization and spectral features suggestive of vacuum resonance, the successful modeling of polarization modulation via a rotating vector model indicates that these high polarization levels arise from geometric effects rather than providing definitive proof of vacuum birefringence, though the results continue to support the presence of QED effects in magnetars.

Roberto Taverna, Roberto Turolla, Lorenzo Marra + 7 more2026-03-04🔭 astro-ph

Dynamics of AGN feedback in the X-ray bright East and Southwest arms of M87, mapped by XRISM

Using high-resolution XRISM/Resolve spectroscopy, this study reveals that while the hot X-ray gas in M87's AGN-associated arms shows limited dynamical impact, the cooler uplifted gas exhibits significant velocity gradients and dispersions, supporting the uplift scenario and suggesting that AGN-driven motions in the hot ICM are short-lived.

A. Simionescu, C. Kilbourne, H. R. Russell + 24 more2026-03-04🔭 astro-ph

Drawing the line between explosion and collapse in electron-capture supernovae -- I. Impact of conductive flame speeds and ignition conditions on the explosion mechanism

Through 56 3D hydrodynamic simulations of ONe white dwarfs, this study identifies a critical transition density range and demonstrates that both ignition conditions and laminar flame speeds are decisive factors in determining whether electron-capture supernovae result in a thermonuclear explosion or a gravitational collapse.

Alexander Holas, Samuel W. Jones, Friedrich K. Roepke + 5 more2026-03-04🔭 astro-ph