Mika Lambert et al 2023 AJ 165 218
What was first categorized as a planet turns out to be a very low-mass star, barely massive enough to fuse hydrogen into helium; further study of the star constrained its activity level and rotation period.
Claudio Ricci and Stéphane Paltani 2023 ApJ 945 55
Adding a dash of dust to a ray-tracing model illuminates the ways that X-ray photons interact with dust grains, yielding results applicable to studies of dusty active galactic nucleus torii.
Thomas Ayres 2023 ApJS 266 6
The Wilson–Bappu effect describes the correlation between a star’s luminosity and the strength of a particular calcium emission line arising from its chromosphere.
Giovanni Sabatini et al 2023 ApJL 947 L18
Cosmic rays — high-energy charged particles accelerated by distant cosmic engines — play an important role in determining the composition and ionization state of star-forming molecular clouds.
Jaegeun Park et al 2023 ApJ 945 33
X-ray data illuminate the particle properties of a pulsar wind nebula; these observations suggest that even higher-energy particles may be present in the source, opening avenues for more study.
Yury S. Aglyamov et al 2023 Planet. Sci. J. 4 111
Adaptation of an existing model allows for investigating lightning on all the gas and ice giants in our solar system; lightning has been either directly observed or inferred to occur on all four giant planets.