V. Missaglia et al 2021 ApJS 255 18
Multiwavelength observations are reported of seven extragalactic radio sources listed as unidentified in the Third Cambridge Revised Catalog (3CR), including two determined to be members of galaxy clusters.
V. Lora et al 2021 ApJ 915 115
New models describe how strong stellar winds from massive stars at a galactic center may interact with the supermassive black hole that they orbit.
Zhoujian Zhang et al 2021 ApJL 916 L11
The second discovery from the COol Companions ON Ultrawide orbiTS (COCONUTS) program, COCONUTS-2b, is the second-coldest (434 K), second-widest-orbit (6,471 au), and nearest (10.9 pc) exoplanet imaged to date.
Ryan Cloutier et al 2021 AJ 162 79
The bulk composition of radius-valley planet TOI-1634 b supports the gas-depleted formation mechanism to explain the emergence of the radius valley around M dwarfs with mass less than ~0.5 solar mass.
Samuel M. Howell 2021 Planet. Sci. J. 2 129
New modeling of Jupiter’s moon Europa predicts that its outer icy shell is ~23–47 km, providing useful estimates for future space missions and interesting implications for the physical processes on icy satellite surfaces.
Terese T. Hansen et al 2021 ApJ 915 103
Abundance analysis of Indus_0, a star in the Indus stellar stream, is consistent with globular cluster star properties, providing the first chemical evidence of a fully disrupted dwarf galaxy containing a globular cluster.