Przemek Mróz et al 2018 AJ 155 121
A candidate free-floating, Neptune-mass planet has been discovered in the galactic disk as a result of a gravitational microlensing event detected by the Optical Gravitational Lensing Experiment (OGLE).
Kyuseok Oh et al 2018 ApJS 235 4
The first 105 months of observations with the Burst Alert Telescope on board the Swift observatory resulted in a catalog of 1632 hard X-ray sources in the 14–195 keV band. 34% of the 422 new detections are AGN.
Matthew J. Holman et al 2018 ApJL 855 L6
A new dwarf planet candidate has been found by the Pan-STARRS Outer Solar System Survey, joining the small but growing set of known distant dwarf planets on metastable resonant orbits.
A. P. Hatzes et al 2018 AJ 155 120
Radial-velocity measurements of γ Dra reveal multi-periodic behavior that may represent a new form of stellar variability — possibly related to oscillatory convective modes — rather than the presence of a planet.
Enrico M. Di Teodoro et al 2018 ApJ 855 33
New observations have revealed a population of non-rotating high-velocity clouds above the galactic plane that may represent the cold gas component accelerated in the nuclear wind driven by our galaxy.
David S. Aguado et al 2018 ApJL 854 L34
The primitive star SDSS J0023+0307 has an upper limit [Fe/H] < −6.6, making it one of the two most iron-poor stars known. It is further missing the usual carbon enhancement found in other hyper-metal-poor stars.