Clay weekly context brief for the Astro category (ISO week 2026-W44).

Clay tracks publications from the Astro feed list. Below are recent items from this category, each with its source and a short description of what the publication covers when one is available in the source feed.

Recent publications:
1. Density-split analyses of the pairwise kinetic Sunyaev-Zeldovich effect
   Source: astro-ph.CO (Cosmology and Nongalactic Astrophysics)
   Link: https://arxiv.org/abs/2610.30267
   We consider the dependence of the kinetic Sunyaev-Zeldovich (kSZ) effect on the environments of foreground cosmological structures.
2. The physical and chemical structure of Titan's upper atmosphere: energy balance, photochemistry and Jeans escape
   Source: astro-ph.EP (Earth and Planetary Astrophysics)
   Link: https://arxiv.org/abs/2610.30258
   Titan's upper atmospheric layers provide a unique opportunity to study how photochemistry, photoionisation, haze microphysics and escape processes shape its atmospheric chemical structure, providing a unique benchmark for understanding these processes in exoplanets.
3. The LBT Y$_{\rm p}$ Project VI: Gas-Phase Chemical Abundance Patterns of Metal-Poor Nebulae
   Source: astro-ph.GA (Astrophysics of Galaxies)
   Link: https://arxiv.org/abs/2610.30289
   Through a combined rest-optical and NIR observing campaign, the Large Binocular Telescope Primordial He Abundance ($Y_{\rm p}$) Project has delivered a precision measurement of $Y_{\rm p}$.
4. Gone Without a Bang: A Search for Failed Core-Collapse Supernovae in ZTF and Predictions for Rubin and Roman
   Source: astro-ph.HE (High Energy Astrophysical Phenomena)
   Link: https://arxiv.org/abs/2610.30276
   The core-collapse of massive stars (${\geq}10\ \rm M_\odot$) usually takes the form of a supernova, but in some cases may lead to a direct collapse, leading to a failed core-collapse supernova (FccSN).
5. Astro2Method: Benchmarking LLMs on Machine Learning Method Selection in Astronomy
   Source: astro-ph.IM (Instrumentation and Methods for Astrophysics)
   Link: https://arxiv.org/abs/2610.30282
   Machine learning (ML) is increasingly used in astronomy, but choosing a suitable method for a scientific problem often requires expertise in both astronomy and ML.
6. Rotation in the Lagoon Nebula with K2
   Source: astro-ph.SR (Solar and Stellar Astrophysics)
   Link: https://arxiv.org/abs/2610.29006
   A low-mass star's rotation rate drives its magnetic field, and in the case of young stars, also affects accretion and planetary formation.
7. Optimal cosmological cross-correlation analysis with U-Net-based processing
   Source: astro-ph.CO (Cosmology and Nongalactic Astrophysics)
   Link: https://arxiv.org/abs/2610.30294
   Cosmological cross-correlation analyses are commonly based on two-point statistics, which are optimal for Gaussian random fields but do not capture all relevant information in the presence of non-Gaussianity, which is ubiquitous in late-time cosmic fields.
8. OGLE-2012-BLG-0563: Relative Proper Motion Constraint from Keck Follow-up finds the correct Lens
   Source: astro-ph.EP (Earth and Planetary Astrophysics)
   Link: https://arxiv.org/abs/2610.30310
   We present Keck/NIRC2 adaptive optics imaging results of planetary microlensing event OGLE-2012-BLG-0563.
9. The PAU Survey: Active galactic nucleus galaxies in galaxy pairs
   Source: astro-ph.GA (Astrophysics of Galaxies)
   Link: https://arxiv.org/abs/2610.30309
   Aims.
10. Nuclear Millimeter Continuum Emission in Radio-Quiet Active Galactic Nuclei: an ALMA Spectral and Variability Study
   Source: astro-ph.HE (High Energy Astrophysical Phenomena)
   Link: https://arxiv.org/abs/2610.30286
   Unresolved millimeter (mm) emission is observed in radio-quiet (RQ) Active Galactic Nuclei (AGN), but its physical origin remains debated.
11. Photometric classification and out-of-taxonomy detection of ZTF transients with FLARE
   Source: astro-ph.IM (Instrumentation and Methods for Astrophysics)
   Link: https://arxiv.org/abs/2610.30656
   Photometric classifiers decide which of the million nightly alerts of time-domain surveys receive one of the few thousand spectra taken each year, and they are the first place where a transient outside the trained classes can be noticed.
12. Enhanced Mass Transfer from Extended Shock-Supported Stellar Chromospheres
   Source: astro-ph.SR (Solar and Stellar Astrophysics)
   Link: https://arxiv.org/abs/2610.29323
   Mass transfer (MT) in binary systems is a crucial and complex process.
13. ULTRAMAN: A Proposed ultrasound detector for macroscopic dark matter
   Source: astro-ph.CO (Cosmology and Nongalactic Astrophysics)
   Link: https://arxiv.org/abs/2610.30507
   We propose ULTRAMAN (ULTRAsound Macro ANalyzer), a passive ultrasound array experiment designed to search for macroscopic dark matter (macros) through coherent acoustic disturbances generated as compact objects traverse a controlled target medium.
14. Ellipsoidal Modeling Framework for TNOs: the triaxial shape of (50000) Quaoar and its implications for Weywot and the dynamical environment
   Source: astro-ph.EP (Earth and Planetary Astrophysics)
   Link: https://arxiv.org/abs/2610.30494
   The three-dimensional shapes of Trans-Neptunian Objects (TNOs) are notoriously difficult to determine due to their slow orbital motion and minimal variations in aspect angle over human timescales.
15. Optical-Infrared Extinction Variation in Nearby Molecular Clouds
   Source: astro-ph.GA (Astrophysics of Galaxies)
   Link: https://arxiv.org/abs/2610.30336
   The dust extinction curve is an important probe of the properties of dust grains, particularly their size distribution.
16. Chandra and Multiwavelength Study of Pevatron Candiate HESS J1702-420A
   Source: astro-ph.HE (High Energy Astrophysical Phenomena)
   Link: https://arxiv.org/abs/2610.30378
   Aims: HESS J1702-420A is a promising Galactic PeVatron candidate whose physical nature remains unknown.
17. Science-driven design and performance evaluation of a Silicon Laue Component lens for hard X-ray polarimetry
   Source: astro-ph.IM (Instrumentation and Methods for Astrophysics)
   Link: https://arxiv.org/abs/2610.31287
   Focusing hard X-rays above 80 keV is challenging for grazing-incidence optics.
18. Stellar Loci X: Selection of Nitrogen-Rich Giants Using GALEX NUV and Synthetic SDSS Photometry
   Source: astro-ph.SR (Solar and Stellar Astrophysics)
   Link: https://arxiv.org/abs/2610.29706
   Nitrogen-rich (N-rich) field stars (likely second-generation escapees from globular clusters) provide a powerful, but currently sample-limited, probe of globular-cluster disruption in the Galactic halo.
19. Same Events, Weaker Bound: Model Dependence in Magellanic Microlensing Limits on Primordial Black Holes
   Source: astro-ph.CO (Cosmology and Nongalactic Astrophysics)
   Link: https://arxiv.org/abs/2610.30510
   OGLE microlensing of the Magellanic Clouds sets the leading bounds on primordial black holes (PBHs) as dark matter from $10^{-8}$ to $10^{3}\,M_\odot$.
20. Quasi-Localization of Short-Wavelength Perturbations in Softened Laplace-Lagrange Chains
   Source: astro-ph.EP (Earth and Planetary Astrophysics)
   Link: https://arxiv.org/abs/2610.30515
   We examine the long-term evolution of localized eccentricity perturbations in a softened Laplace-Lagrange chain.
21. Optical and near-infrared s-process abundance scales in the Galactic disc
   Source: astro-ph.GA (Astrophysics of Galaxies)
   Link: https://arxiv.org/abs/2610.30346
   A discrepancy has recently emerged between optical and near-infrared (NIR) s-process abundance scales, particularly for Neodymium (Nd).
22. Multiwavelength Classification of Chandra Sources in Omega Centauri
   Source: astro-ph.HE (High Energy Astrophysical Phenomena)
   Link: https://arxiv.org/abs/2610.30604
   We present a comprehensive study of X-ray sources in the globular cluster NGC 5139 to date.
23. Simulation-based inference of profile evolution for high-precision pulsar timing
   Source: astro-ph.IM (Instrumentation and Methods for Astrophysics)
   Link: https://arxiv.org/abs/2610.31450
   Pulsars are exceptional cosmic laboratories, the most stable of which rival atomic clocks.
24. Coronal spectroscopy - Past, Present and Future
   Source: astro-ph.SR (Solar and Stellar Astrophysics)
   Link: https://arxiv.org/abs/2610.29735
   After the beginning of photography of solar corona during the eclipses in the year 1860, efforts began to carry out spectroscopic observations of solar corona.
25. Constraints on interacting dark energy with a constant equation of state in light of DESI DR2: The role of the interaction term
   Source: astro-ph.CO (Cosmology and Nongalactic Astrophysics)
   Link: https://arxiv.org/abs/2610.30784
   Recent DESI baryon acoustic oscillation (BAO) analyses suggest a preference for an evolving dark energy equation of state (EoS) that crosses the phantom divide $w=-1$.
26. Uncertainty estimation of incoming comet trajectories with a thermophysical non-gravitational force model for Comet Interceptor encounter planning
   Source: astro-ph.EP (Earth and Planetary Astrophysics)
   Link: https://arxiv.org/abs/2610.30871
   The European Space Agency Comet Interceptor mission is designed to fly-by an as-yet undetermined incoming long-period or dynamically-new comet, which will require an accurate prediction of its trajectory.
27. JWST observations of the planetary nebula NGC 6302 IV: PAH spectral characteristics, formation and evolution
   Source: astro-ph.GA (Astrophysics of Galaxies)
   Link: https://arxiv.org/abs/2610.30441
   Polycyclic aromatic hydrocarbons (PAHs) and carbonaceous dust have been observed in Oxygen-rich planetary nebulae (PNe), yet their formation and evolution in these environments is an open question.
28. Early panchromatic spectra reveal helium in the thermonuclear supernova 2024kce
   Source: astro-ph.HE (High Energy Astrophysical Phenomena)
   Link: https://arxiv.org/abs/2610.30674
   Faint Type I supernovae blur the boundaries between spectroscopic classes, obscuring their progenitors and explosion mechanisms.
29. A Generalized Framework for Rapid Polarization Response Generation in Wide Field-of-View Compton Polarimeters
   Source: astro-ph.IM (Instrumentation and Methods for Astrophysics)
   Link: https://arxiv.org/abs/2610.31559
   Polarimetry is the most direct probe of the unsettled radiation mechanism and magnetic field structure of gamma-ray burst (GRB) prompt emission at the energies where it peaks, tens of keV to about 1 MeV.
30. Neutron Star-Main-Sequence Star Collision: Formation and Long-Term Evolution of Thorne-\.Zytkow Objects
   Source: astro-ph.SR (Solar and Stellar Astrophysics)
   Link: https://arxiv.org/abs/2610.29833
   Thorne-$\dot{\mathrm{Z}}$ytkow objects (T$\dot{\mathrm{Z}}$Os) are stars containing a neutron-star (NS) or black-hole (BH) core embedded in a stellar envelope and powered primarily by mass accretion onto the core.
31. GPAge: a Global Parameterization based on cosmic Age for some unified early-time and late-time solutions to the Hubble tension
   Source: astro-ph.CO (Cosmology and Nongalactic Astrophysics)
   Link: https://arxiv.org/abs/2610.30961
   The over $5\sigma$ Hubble tension continues to motivate modifications of the standard $\Lambda $-cold-dark-matter ($\Lambda \rm CDM$) model.

Sources in this brief: astro-ph.CO (Cosmology and Nongalactic Astrophysics); astro-ph.EP (Earth and Planetary Astrophysics); astro-ph.GA (Astrophysics of Galaxies); astro-ph.HE (High Energy Astrophysical Phenomena); astro-ph.IM (Instrumentation and Methods for Astrophysics); astro-ph.SR (Solar and Stellar Astrophysics).
Selected 31 of 384 available items for this weekly brief.