Erini L. Lambrides et al 2021 ApJ 919 43
To err is human: visual assessments of galaxy mergers are confounded by human biases, but probabilistic modeling can account for these biases and enable correct labeling of galaxies to within 1% accuracy.
Haruo Yasuda et al 2021 ApJL 919 L16
Interaction with circumstellar material could make supernova remnants fade to obscurity between 1,000 and 5,000 years after exploding, possibly explaining the low number of known supernova remnants in our galaxy.
Eric G. Hintz et al 2021 AJ 162 149
Archival observations from the American Association of Variable Star Observers of red giant χ Cygni reveal a change in the period of the star’s variations in 1917, potentially due to a sudden loss of mass.
Sixiang Wen et al 2021 ApJ 918 46
Relativistic modeling of a star being ripped apart by a black hole yields the first clear spin measurement of an intermediate-mass black hole and places limits on the potential masses of ultralight bosons.
Monica G. Bobra et al 2021 ApJS 256 26
Sun-lovers rejoice: a new catalog derived from Solar Dynamics Observatory data provides maps of every solar active region since 1996, encompassing two solar cycles.
A. Minelli et al 2021 ApJL 918 L32
Established analysis methods suggest that four studied globular clusters were born in the Milky Way, but a new analysis of elements near iron on the periodic table reveals that two were likely captured from another galaxy.