E. W. Cliver et al 2020 ApJ 903 41
The 774 AD solar proton event, a tremendous increase in proton influx identified in measurements of Japanese tree rings, may have been produced by a single, 1033-erg solar superflare.
H Perry Hatchfield et al 2020 ApJS 251 14
The CMZoom survey catalog contains 285 robust (816 total) compact sources in the galactic center. They have effective radii between 0.04 and 0.4 pc and are the potential progenitors of star clusters.
Kevin France et al 2020 AJ 160 237
Hubble and Chandra imaging of Barnard’s Star, a 10-Gyr old M dwarf, indicates that quiescent stellar XUV flux does not lead to strong atmospheric escape, but the flare environment could drive significant atmospheric loss.
Yong-Hee Lee et al 2020 ApJ 903 5
The cyclical bursts of the young stellar object EC 53 are carefully studied, generating a description in which mass builds up and then drains from the inner protoplanetary disk surrounding the young stellar object.
Vaidehi S. Paliya et al 2020 ApJL 903 L8
The first γ-ray emitting BL Lac object — a class of jetted active galactic nuclei — has been found at a redshift beyond z = 3, i.e., within the first two billion years of the age of the universe.
Edward Ashton et al 2020 Planet. Sci. J. 1 52
New analysis of archival data from the Canada–France–Hawaii Telescope reveals 52 objects that are likely small irregular moons of Jupiter, suggesting a total population of ~600 radius >0.4 km moons around the planet.