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.
L. Molnár et al 2018 ApJS 234 37
In the field of view surrounding Uranus, 608 main-belt asteroids were observed with K2. The resulting light curves revealed rotation rates for 90 of these asteroids (86 of which were previously unknown).
Neil T. Lewis et al 2018 ApJ 854 171
New models demonstrate that the presence of a continent located at the substellar point on a planet causes global cooling and increases day–night temperature contrasts by limiting heat redistribution.
L. Fossati et al 2018 AJ 155 113
Far-ultraviolet observations of WASP-18 with Hubble suggest that the star’s unusually low activity level is intrinsic, possibly caused by star–planet tidal interaction with its massive, very close-in Jupiter-like planet.