Maryam Aghaei Abchouyeh et al 2026 ApJ 1006 212

The lack of detected gravitational waves associated with the supernova SN 2023ixf suggests that the event birthed a neutron star rather than a black hole, and the progenitor star’s mass was likely below 20 solar masses.

John W. Noonan et al 2026 ApJL 1007 L42

Hubble Space Telescope observations of 3I/ATLAS show that the comet’s coma is depleted in sulfur, which may be due to its formation in a cold, sulfur-depleted environment that was shielded from ultraviolet light.

Qian Huang et al 2026 ApJ 1006 167

Observations of a nearby dwarf galaxy suggest that Wolf–Rayet stars are able to shape their environments on subkiloparsec scales, but their winds are not able to drive galaxy-scale outflows.

Thiago Ferreira and Malena Rice 2026 AJ 172 111

Short-period brown dwarfs appear to have low orbital eccentricities, while longer-period brown dwarfs appear to have higher eccentricities, likely reflecting the eccentricity-damping timescales of the two populations.

Alok C. Gupta et al 2026 ApJS 286 7

Long-term photometric monitoring shows OJ 287 trending bluer when brighter in short- and long-term variability; spectroscopic monitoring suggests a central black hole mass of at least 3.89 billion solar masses.

Yusuke Kawabata et al 2026 ApJL 1007 L39

Using a balloon-borne 1-meter telescope, researchers have disentangled the three-dimensional structure of Ellerman bombs, which are identified via brief brightenings in the wings of H-alpha lines.