Mariko Kimura et al 2023 ApJ 951 124

A cataclysmic variable system might be a precursor to a black widow pulsar system; if the system’s white dwarf accretes enough material, it will become a neutron star that feeds off its low-mass stellar companion.

Matthias Y. He and Lauren M. Weiss 2023 AJ 166 36

Planetary systems with giant outer planets may exhibit more irregular spacing between the inner planets compared to systems without giant planets, giving a new way to identify systems containing unseen giant planets.

M. Ryleigh Davis et al 2023 Planet. Sci. J. 4 148

An absorption feature seen in the spectrum of Jupiter’s moon Europa continues to defy understanding, although researchers have placed a new lower limit to its formation timescale and ruled out certain processes.

Agnibha De Sarkar et al 2023 ApJ 951 62

RS Ophiuchi undergoes nova outbursts every 15–20 years, and new data in the very-high-energy gamma-ray regime have enabled researchers to test a new model for the origin of its high-energy emission.

Alex R. Howe et al 2023 ApJL 951 L25

If the model-confounding T-type brown dwarf GJ 229B is actually two brown dwarfs, that could provide a better fit to model parameters including temperature, mass, and radius.

Shuo Xiao et al 2023 ApJS 268 5

X-ray bursts most commonly last about 2 milliseconds, which corresponds to an origin region of about 600 kilometers; this supports the hypothesis that X-ray bursts arise from the magnetospheres of magnetars.