Kavli Affiliate: Salvatore Vitale | Summary:Uncovering the origins of merging binary black holes is a key goal in gravitational-wave astrophysics, but identifying the formation channel of a particular binary is complicated by imprecise measurements and uncertain theoretical predictions. While classification often involves computing metrics from an event’s inferred properties, measurement precision varies across parameter space. […]

Kavli Affiliate: George Ricker | Summary:The trans-Neptunian object 2026 ED$_138$ was announced in 2026 October as the first dwarf-planet candidate in our solar system discovered by the Vera C. Rubin Observatory. The Transiting Exoplanet Survey Satellite (TESS) observed it in five month-long sectors between 2019 and 2026, four of them before its discovery. We subtract […]

Kavli Affiliate: Herman Marshall | Summary:After decades of only failed transitions, the black hole X-ray binary GS 1354-64 has undergone a complete outburst again. We present its first X-ray polarimetric investigation in the fading steep-power-law (SPL) state, following an earlier intermediate-state IXPE campaign during the same outburst. The 2-8 keV emission has a polarization degree […]

Kavli Affiliate: Mark Vogelsberger | Summary:(abridged) Stellar feedback regulates galactic baryon cycles, but galaxy-scale simulations often cannot resolve supernova cooling radii. Momentum-based subgrid models can consequently underresolve the hot gas around young stars. We develop an "anchor-and-refine" feedback scheme that anchors a host cell near each star particle, preventing its displacement and preserving a thermal-feedback […]

Kavli Affiliate: Mark Vogelsberger | Summary:Self-interacting dark matter (SIDM) can form cores in dark matter haloes and later drive their gravothermal collapse, raising their central densities far above those of NFW haloes. Simulating this collapse is computationally demanding, requiring increasingly short time-steps and a large particle number to resolve the shrinking core. We present NORI, […]

Kavli Affiliate: Michael McDonald | Summary:In this extension of our "Reigniting the FUSE" series, we have obtained new far-ultraviolet spectroscopy of 3 starbursting brightest cluster galaxies with the Cosmic Origins Spectrograph (COS) aboard HST. With these new data, in combination with archival COS data of 2 additional systems, we measure star formation rates (SFRs) from […]

Kavli Affiliate: Erin Kara | Summary:We present a high-resolution XRISM/Resolve observation of the persistent black hole candidate 4U 1957+115, revealing the first detection of an intrinsic disk wind in this source. The absorption is dominated by highly ionized Fe XXV and Fe XXVI and varies substantially throughout the observation, becoming prominent during the final $sim40$ […]

Kavli Affiliate: Robert Simcoe | Summary:We present a stacked JWST/NIRSpec spectrum of 104 galaxies at $λ_rm rest=1200unicodex20132000;mathrmmathringA$ to study nebular emission and absorption from the interstellar medium (ISM) and stellar winds. The sample is drawn from known [O III] emitters with mean redshift $z=6.50$, absolute UV magnitude $M_mathrmUV=-20.7$, and stellar mass $M_star=10^8.93;mathrmM_odot$. The stacked continuum […]