Pawel Pietrukowicz et al 2019 ApJL 881 L41
OGLE-UCXB-01, a 12.8 minute variable object located in the galactic bulge globular cluster Djorg 2, is shown to be a likely ultracompact X-ray binary system exhibiting a fast period decrease as its orbit decays.
Khyati Malhan et al 2019 ApJ 881 106
The GD-1 stellar stream has a secondary diffuse, extended stellar component around it, supporting the idea that its progenitor was originally formed outside of the Milky Way in a now defunct dark satellite galaxy.
S. J. Zheng et al 2019 ApJS 244 1
By combining 5-day observations of the Crab pulsar made with three on-board telescopes, the position and velocity of the Insight-HXMT are pinpointed to within 10 km and 10 m/s, respectively.
Tom A. Nordheim et al 2019 ApJL 881 L29
Particle physics simulations suggest that Europa is partially shielded from galactic cosmic rays by the Jovian magnetosphere, and the radiation dose due to these particles is small at Europa’s surface.
Jonathan Horner et al 2019 AJ 158 100
Detailed analysis of the orbital stability of the HD 181433 planetary system suggest previous measurements of its orbital properties may be incorrect; a different system architecture is necessary for it to be stable.
Evan N. Kirby et al 2019 ApJ 881 45
Measurements of abundances in dwarf-galaxy satellites of the Milky Way suggest that the dominant type of supernova Ia in ancient dwarf galaxies is the explosion of a sub-Chandrasekhar-mass white dwarf.