Nicholas Z. Rui et al 2019 ApJ 877 37
Hubble infrared observations of stars in the Quintuplet star cluster — a massive star cluster near the galactic center (GC) — provide evidence that young massive clusters in the GC dissolve on a several-megayear timescale.
Audrey Thirouin and Scott S. Sheppard 2019 AJ 157 228
Light curves for 42 cold classical trans-Neptunian objects (TNOs) — primordial planetesimals in our solar system — demonstrate that they have slower rotations and are more elongated/deformed than other TNOs.
Shih-Yun Tang et al 2019 ApJ 877 12
Tidal structures have been discovered around the intermediate-aged (~700–800 Myr), nearby (~85 pc), disrupting star cluster Coma Berenices; an adjacent stellar group is also found in the final stages of disruption.
Yasuhiro Hasegawa et al 2019 ApJL 876 L32
Models attempting to reproduce the heavy-element content trend of observed exoplanets imply that planets initially underwent efficient solid accretion beyond r ≥ 0.6 AU and subsequently migrated to their present locations.
Raffaele D’Abrusco et al 2019 ApJS 242 4
Two new catalogs are presented of radio-loud candidate blazars with mid-infrared colors consistent with the colors of confirmed γ-ray-emitting blazars; these catalogs will help with identification of the γ-ray sky.
Philip Massey et al 2019 AJ 157 227
11 new quasars have been discovered behind the stellar disks of the spiral galaxies M31 and M33, bringing the total to 26; these sources will serve as excellent probes of the interstellar medium in these stellar disks.