Clay weekly context brief for the Astro category (ISO week 2026-W29).

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. The FAST All Sky HI Survey DR2: the FASHI Catalog and the HI Mass Function
   Source: astro-ph.SR (Solar and Stellar Astrophysics)
   Link: https://arxiv.org/abs/2606.31539
   The FAST All Sky HI Survey (FASHI) conducted with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) has mapped $\sim 19500\,\mathrm{deg}^2$ of the sky north of DEC $= -14^{\circ}$, detecting $156411$ extragalactic HI sources at $z< 0.09$ with a median sensitivity of $0.57\,\mathrm{mJy}\,\mathrm{beam}^{-1}$ at a velocity resolution of $6.4\,\mathrm{km}\,\mathrm{s}^{-1}$.
2. Enhancing the Cherenkov Telescope Array Observatory high-level performance through an event-type-based analysis
   Source: astro-ph.HE (High Energy Astrophysical Phenomena)
   Link: https://arxiv.org/abs/2607.09286
   The analysis traditionally employed by Imaging Atmospheric Cherenkov Telescopes involves optimizing quality cuts to select a sub-sample of high-quality events.
3. Magnetic activity in cool stars: manifestations and relevance to exoplanets
   Source: astro-ph.EP (Earth and Planetary Astrophysics)
   Link: https://arxiv.org/abs/2606.31617
   Understanding stellar magnetic activity is central to exoplanet science in two ways: it sets the dynamic astrospheric boundary condition governing planetary space environments, and it is the primary obstacle to exoplanet detection and characterisation, since magnetically driven variability imprints correlated quasi-periodic signals across detection time series.
4. Three-form dark energy: constraints and multi-probe comparison with $\Lambda$CDM
   Source: astro-ph.CO (Cosmology and Nongalactic Astrophysics)
   Link: https://arxiv.org/abs/2606.27436
   Three-form fields provide a theoretically well-motivated framework for dark energy, arising in higher-dimensional theories and exhibiting a rich cosmological phenomenology.
5. labrador: A domain-optimized machine-learning tool for gravitational wave inference
   Source: astro-ph.IM (Instrumentation and Methods for Astrophysics)
   Link: https://arxiv.org/abs/2604.08897
   Fast and reliable inference of gravitational-wave source parameters is crucial for analyzing large catalogs that are reaching the size of hundreds of detections, and for identifying short-lived electromagnetic counterparts.
6. Indication for Decreasing Dispersion Measure in the Population of Repeating Fast Radio Bursts and Connection to Young Supernova Remnant Expansion
   Source: astro-ph.SR (Solar and Stellar Astrophysics)
   Link: https://arxiv.org/abs/2606.23903
   Fast Radio Bursts (FRBs) are millisecond-duration, highly energetic radio transients of uncertain origin.
7. In-medium hyperon potentials and the quarkyonic hyperon onset: charged $\Sigma$'s in $\beta$-equilibrium and the neutrino connection
   Source: astro-ph.HE (High Energy Astrophysical Phenomena)
   Link: https://arxiv.org/abs/2607.09280
   Quarkyonic matter resolves the neutron-star hyperon puzzle statistically: neutrons fill low-momentum $d$-quark phase space, shifting the $S=-1$ threshold from $\muB=M_Y$ to $2M_Y-M_N$ and suppressing residual softening by $1/\Nc^3$ in the Fujimoto--Kojo--McLerran (FKM) mechanism.
8. JWST Edge-on Disk Ice (JEDIce): Vibrationally hot, rotationally cold H$_2$ in the outer disk of Oph 163131 non-thermally excited by UV and cosmic rays
   Source: astro-ph.EP (Earth and Planetary Astrophysics)
   Link: https://arxiv.org/abs/2607.09407
   Constraining ionization and excitation processes in protoplanetary disks is essential for understanding the chemical structure and evolution of disk material, shaping planet formation pathways.
9. Pushing spectral siren cosmology into the third-generation era: a blinded mock data challenge
   Source: astro-ph.CO (Cosmology and Nongalactic Astrophysics)
   Link: https://arxiv.org/abs/2602.17756
   Gravitational wave (GW) spectral sirens offer a promising method for measuring cosmological parameters using GW data only - without relying on external redshift information such as electromagnetic counterparts or galaxy catalogs - by exploiting distributional features in the population of GW sources.
10. Inference with finite time series II: the window strikes back
   Source: astro-ph.IM (Instrumentation and Methods for Astrophysics)
   Link: https://arxiv.org/abs/2508.11091
   Smooth window functions are often applied to strain data when inferring the parameters describing the astrophysical sources of gravitational-wave transients.
11. Solar Reflected Dark Matter under the Influence of a Dark Magnetic Field
   Source: astro-ph.SR (Solar and Stellar Astrophysics)
   Link: https://arxiv.org/abs/2510.18028
   The scattering of dark matter particles within the Sun's hot plasma can lead to the acceleration of dark matter, producing a high-energy solar-reflected DM flux detectable in ground-based experiments.
12. Neutrino-induced hyperon final-state interactions as constraints on the in-medium hyperon potential
   Source: astro-ph.HE (High Energy Astrophysical Phenomena)
   Link: https://arxiv.org/abs/2607.09273
   Hyperon single-particle potentials $U_Y(\rho)$ control propagation in nuclei and hyperon onset in dense matter, where they soften the neutron-star equation of state and reduce the maximum mass -- the ``hyperon puzzle''.
13. HD 148797: A bright F-type star with two moderate-period low-density sub-Jovian planets. Compact multi-planet architectures are common in the Neptunian savanna
   Source: astro-ph.EP (Earth and Planetary Astrophysics)
   Link: https://arxiv.org/abs/2607.09656
   We report the confirmation and characterisation of two moderate-period sub-Jovian planets transiting the bright F-type star HD 148797 (G=9.4 mag, Teff=6441 +/- 51 K).
14. Non-parametric exploration of minimally coupled gravity with phantom crossing
   Source: astro-ph.CO (Cosmology and Nongalactic Astrophysics)
   Link: https://arxiv.org/abs/2512.13691
   Recent measurements of the baryon acoustic oscillations by the Dark Energy Spectroscopic Instrument (DESI), especially when combined with cosmic microwave background (CMB) and supernova data, favor a late-time dark energy equation of state that crosses $w=-1$, which has been argued to point toward non-minimal conformal coupling in Horndeski gravity.
15. WST -- Wide-field Spectroscopic Telescope: The Next Leap in Wide-field Spectroscopy
   Source: astro-ph.IM (Instrumentation and Methods for Astrophysics)
   Link: https://arxiv.org/abs/2606.20822
   The Wide-field Spectroscopic Telescope (WST) is a concept for a dedicated 12-m spectroscopic survey facility designed to address some of the most important questions in astrophysics in the 2040s.
16. Cataclysmic Variables Photometric Periods from TESS
   Source: astro-ph.SR (Solar and Stellar Astrophysics)
   Link: https://arxiv.org/abs/2607.08727
   We present a sample of coherent and stable photometric period determinations for cataclysmic variables, based on TESS photometry through sector 102.
17. Accelerator neutrinos as a probe of in-medium hyperon potentials
   Source: astro-ph.HE (High Energy Astrophysical Phenomena)
   Link: https://arxiv.org/abs/2607.09255
   Charged-current (anti)neutrino interactions create $\Lambda$ and $\Sigma$ hyperons \emph{inside} the nucleus, making hyperon final-state interactions a terrestrial probe of the in-medium potentials that govern hyperon onset in neutron stars.
18. Beyond the Cube: Overlapping Grid Methods for Debris Collision Risk Assessment
   Source: astro-ph.EP (Earth and Planetary Astrophysics)
   Link: https://arxiv.org/abs/2607.09634
   The cube method reduces conjunction screening in orbital debris simulations to $\mathcal{O}(N)$ cost by evaluating only object pairs sharing the same grid cell at each snapshot, but systematically assigns zero collision probability to pairs separated by a cell boundary at that epoch, a failure known as boundary blindness.
19. Cosmic homogeneity: the effect of redshift-space distortions and bias and cosmological constraints
   Source: astro-ph.CO (Cosmology and Nongalactic Astrophysics)
   Link: https://arxiv.org/abs/2507.18720
   We present a novel cosmological analysis based on the angular correlation dimension $D_2$ curve, a cumulative statistic derived from the two-point correlation function.
20. AS-Bridge: A Bidirectional Generative Framework Bridging Next-Generation Astronomical Surveys
   Source: astro-ph.IM (Instrumentation and Methods for Astrophysics)
   Link: https://arxiv.org/abs/2603.11928
   The upcoming decade of observational cosmology will be shaped by large sky surveys, such as the ground-based LSST at the Vera C.

Sources in this brief: astro-ph.CO (Cosmology and Nongalactic Astrophysics); astro-ph.EP (Earth and Planetary Astrophysics); astro-ph.HE (High Energy Astrophysical Phenomena); astro-ph.IM (Instrumentation and Methods for Astrophysics); astro-ph.SR (Solar and Stellar Astrophysics).
Selected 20 of 70 available items for this weekly brief.