Analysis of a particular microlensing signal suggests that there’s no simple model of the event; instead, it requires microlensing parallax, lens orbital motion, and a magnified binary companion to the host, with xallarap.
Modeling of accretion onto black holes of varying spins suggests that all hot accretion flows will develop intermittent jets if allowed to evolve for long enough.
At a distance of 4.4 au from the Sun, interstellar object 3I/ATLAS showed no signs of emission from typical cometary species, in agreement with models that predict activity to start at smaller heliocentric distances.
Detailed spectroscopy has revealed a bow-shaped feature in the radial-velocity structure of the Rosette Nebula, suggesting a possible interaction between the Rosette and a nearby supernova remnant.
A new two-dimensional hydrodynamics code, SPLASH, has been developed to model the early stages of constant-rate accretion onto a spherical neutron star, during which a convective instability is triggered.
The presence of hydrated salts in the rocky surface material on a body like Ceres is thought to slow the retreat of the ice table; Ceres’s average equatorial temperatures show delays of a few to tens of millions of years.