Several purported high-redshift active galactic nuclei identified in JWST images have been revealed via spectroscopy to instead be brown dwarfs, including the most distant brown dwarf yet discovered.
Researchers examine the importance of uncertain reaction rates on our calculations of pycnonuclear fusion — a type of slowly progressing nuclear fusion that rarely occurs outside extremely dense environments.
JWST confirms what was only hinted at by previous infrared telescopes: icy pebbles do migrate inward in compact disks more readily than they do in larger disks with deep gas gaps.
A search for transit depth variability among 330 previously discovered exoplanets turns up four promising candidates; of those four, only one has variability likely due to the planet or its host star.
The Lucy spacecraft, which in October 2021 began its journey to visit eight asteroids, took pictures of the Moon while getting a gravity assist from Earth, providing a valuable test of its imaging system.
Jie Ju et al 2024 ApJS 270 11
Using selection criteria based on several spectral lines, researchers have constructed a new catalog of more than 5,000 blue horizontal-branch stars, which are old, low-mass, metal-poor stars.