Rosalba Perna et al 2021 ApJ 915 10

Rapid accretion in the dense disks around active galactic nuclei can cause neutron stars to grow to the point of exceeding the maximum mass allowed by their equation of state, leading to their collapse into black holes.

Mohamad Ali-Dib et al 2021 AJ 162 19

New examination of photometrically very red trans-Neptunian objects shows these bodies are sharply constrained to eccentricities <0.42 and inclinations <21°, such that very few of them appear in the scattered disk.

Jonathan Gagné et al 2021 ApJL 915 L29

Analysis of 14 co-moving groups of stars indicates that known nearby moving groups may be unexpectedly spatially extended, and some might be parts of tidal tails around the cores of known open clusters.

Edyta Podlewska-Gaca et al 2021 ApJS 255 4

Publicly available data from the Kepler mission includes photometry for 1,026 asteroids, of which 188 have now had their rotation periods determined from the data.

Zhengyi Chen et al 2021 ApJ 915 1

Observations of lenticular galaxy PGC 38025 suggest its star formation was triggered by a gas-rich minor merger, and its off-nuclear blue core might be a local star formation event from the accretion/merger process.

Shunke Ai and Bing Zhang 2021 ApJL 915 L11

Analysis shows the X-ray transient XRT 201423, which has a nearly flat plateau lasting 4.1 ks followed by a steep decay, is consistent with the signal expected from a magnetar formed through a binary neutron star merger.