William Thompson et al 2023 AJ 165 29

The star HR 8799 is known to host four planets, but researchers think there might be more — a recent search turned up a candidate planet interior to the known planets, and the technique used could be applied to other planetary systems.

Katherine de Kleer et al 2023 Planet. Sci. J. 4 37

Using data of auroral emission at multiple different wavelengths — some auroral wavelengths were detected at a planet beyond Earth for the first time — a research team constrained the atmospheric properties of some of Jupiter’s moons.

Xiangdong Sun et al 2023 ApJ 942 55

Simulations suggest that if stars composed of hyperons — subatomic particles heavier than protons or neutrons that likely exist in the cores of neutron stars — are present, they might max out at just over twice the Sun’s mass.

Mar Mezcua et al 2023 ApJL 943 L5

Supermassive black holes in a sample of dwarf galaxies appear to be more massive than expected; if these dwarf galaxies grow to be massive galaxies, that means massive galaxies’ black holes could have originated in dwarf galaxies.

Sho Fujibayashi et al 2023 ApJ 942 39

The greater the difference in the masses of merging neutron stars, the more neutrons are expelled in the collision, resulting in the creation of heavier elements than in a merger with more equal masses.

Xuepeng Chen et al 2023 AJ 165 16

A newly discovered gaseous filament contains multiple intriguing structures, such as a 32-parsec-wide bubble that might be the result of a massive star’s winds that drove turbulent motion in the filament.