🔭 Category

astro-ph

1385 papers

Tracing the AGN-Merger Connection: insights from cosmological simulations and JWST mock observations

By combining cosmological simulations with JWST mock observations, this study reveals that while galaxy mergers significantly trigger AGN activity in gas-poor environments, their observational detection via morphological signatures is hindered at higher redshifts, underscoring the necessity of integrating realistic simulations with observational data to fully understand the AGN-merger connection.

Hannah Jhee, Ena Choi, Rachel S. Somerville + 6 more2026-03-05🔭 astro-ph

Cosmology with the line-of-sight shear of strong gravitational lenses

This paper proposes utilizing the line-of-sight shear of strong gravitational lenses detected in Stage-IV surveys as a new cosmological probe, demonstrating through analytical derivations and covariance analysis that this approach significantly enhances the standard $3\times 2ptcorrelationmethodtoapt correlation method to a 6\times 2$pt scheme with high signal-to-noise ratio and potential for mitigating systematic errors.

Pierre Fleury, Daniel Johnson, Théo Duboscq + 2 more2026-03-05🔭 astro-ph

Spiral formation caused by late infall onto protoplanetary disks

This study demonstrates that late infall onto protoplanetary disks can generate distinct spiral structures observable in scattered light and CO line emission, with gradual gas accretion producing well-defined two-armed spirals and active streamer accretion creating flocculent patterns, while noting that these surface-level perturbations generally do not significantly disrupt the midplane unless the infalling mass rivals the disk mass.

L. -A. Hühn, C. N. Kimmig, C. P. Dullemond2026-03-05🔭 astro-ph

The Effect of Different Methods for Accounting for αα-enhancement on the Asteroseismic Modeling of Metal-Poor Stars

This study demonstrates that homogeneous asteroseismic modeling of eight metal-poor, α\alpha-enhanced evolved stars yields consistent fundamental properties regardless of whether α\alpha-enhancement is treated fully or via ad hoc metallicity corrections, while also confirming a breakdown of the νmax\nu_{\text{max}} scaling relation at low metallicities that necessitates detailed modeling for accurate mass and age determinations.

Christopher J. Lindsay, J. M. Joel Ong, Sarbani Basu + 2 more2026-03-05🔭 astro-ph

Discovery of Strong Energy-Dependent X-ray Polarization in the Intermediate State of GS 1354-64

Using IXPE observations of the 2025-2026 outburst, this study reports the discovery of significant, strong energy-dependent X-ray polarization in the black hole binary GS 1354-64 during an intermediate state, revealing a ~4% polarization degree that increases to ~11% at higher energies and providing new insights into the accretion geometry and coronal structure of black hole X-ray binaries.

Swati Ravi, Lorenzo Marra, James F. Steiner + 20 more2026-03-05🔭 astro-ph

Multidisciplinary Design Optimization of a Low-Thrust Asteroid Orbit Insertion Using Electric Propulsion

This paper presents a multidisciplinary design optimization framework using OpenMDAO and Dymos that simultaneously optimizes low-thrust trajectories and spacecraft power systems for asteroid orbit insertion, explicitly coupling variable-specific impulse Hall thruster performance with time-varying solar power availability to overcome the limitations of traditional simplifying assumptions.

Yacob Medhin, Tushar Sial, Simone Servadio2026-03-05🔭 astro-ph

Most open clusters follow the radial acceleration relation (RAR) and the baryonic Tully-Fisher relation (BTFR)

This study demonstrates that approximately 90% of Milky Way open clusters, particularly those with fewer than 250 stars, align with the radial acceleration relation and baryonic Tully-Fisher relation with an acceleration scale consistent with MOND predictions, suggesting that low-acceleration gravitational dynamics operate on parsec scales within the Galaxy.

Mark D. Huisjes, X. Hernandez2026-03-05🔭 astro-ph

The multi-wavelength vertical structure of the archetypal ββ Pictoris debris disk

This study utilizes multi-wavelength thermal imaging to reveal that the archetypal β\beta Pictoris debris disk exhibits a vertically thicker mid-infrared structure compared to its millimeter counterpart, a finding that challenges collisional damping models and supports a scenario driven by radiation pressure, random collisions, and secular perturbations from inner giant planets.

Yinuo Han, Mark C. Wyatt, Marija R. Jankovic + 4 more2026-03-05🔭 astro-ph

Discovery of a z≃4.9z\simeq 4.9 Lyman-αα Emitter Protocluster: Wavelength-Dependent Environmental Effects on Galaxy Structure

This study reports the discovery of a protocluster at z ≈ 4.9 and reveals that its member galaxies are significantly larger in rest-frame optical light compared to field galaxies, suggesting that dense protocluster environments at this epoch preferentially influence the structure of extended stellar populations through mechanisms like tidal interactions or accelerated star formation.

Ronaldo Laishram, Yusei Koyama, Haruka Kusakabe + 3 more2026-03-05🔭 astro-ph

Accretion onto the Embedded Protostar L1527 IRS: Insights from JWST NIRSpec and MIRI Observations

Using JWST NIRSpec and MIRI observations, this study analyzes atomic hydrogen emission in scattered light from the Class 0 protostar L1527 IRS to characterize its magnetospheric accretion, estimating an accretion rate of approximately $1\times10^{-7}~ \text{M}_\odot \text{yr}^{-1}$ and discussing implications for non-steady, asymmetric accretion processes.

W. Blake Drechsler, John J. Tobin, Patrick D. Sheehan + 12 more2026-03-05🔭 astro-ph

The Marked Power Spectrum as a Practical Bispectrum Measure for Galaxy Redshift Surveys

This paper demonstrates that the marked power spectrum is a practical and efficient alternative to the bispectrum for extracting non-Gaussian information from galaxy redshift surveys, as it effectively breaks parameter degeneracies, accommodates standard survey geometry treatments, and allows for cosmological inference through smooth interpolation rather than complex analytical modeling.

Haruki Ebina, Martin White, Edmond Chaussidon2026-03-05🔭 astro-ph

Long-term activity cycles in planetary M stars observed with SOPHIE

Using 13 years of high-resolution SOPHIE spectroscopic data, this study identifies and characterizes distinct long-term magnetic activity cycles of approximately 4.8 and 4.9 years in the exoplanet-hosting M dwarfs GJ 617A and GJ 411, respectively, confirming their magnetic origin and distinguishing them from planetary signals to improve future exoplanet detection efforts.

C. G. Oviedo, A. P. Buccino, R. F. Díaz + 5 more2026-03-05🔭 astro-ph