T. S. Li et al 2018 ApJ 866 22
A spectroscopic study of the tidal tails and core of the Milky Way satellite Tucana III reveal a spread in metallicity, suggesting that the satellite is likely a dwarf galaxy rather than a star cluster.
Haining Li et al 2018 ApJS 238 16
A search for very metal-poor ([Fe/H]<-2.0) stars in the Milky Way resulted in a sample of 10,008 stars — the largest number of candidates to date that are bright enough for high-resolution follow-up with 4–10 m telescopes.
Brett M. Morris et al 2018 AJ 156 203
Individual observations suggest starspots are co-located with bright plages in the chromosphere of a G1 star, as with the Sun; in contrast, starspots and plages do not appear to be co-located on two observed K stars.
Merrill A Roberts et al 2018 ApJ 866 14
Three internal coronal-hole jet regions, featuring different wave modes and levels of compressibility, have distinct identifying signatures detectable by the Parker Solar Probe in a mission encounter.
Matthew A. Taylor et al 2018 ApJL 867 L15
Fifteen new dwarf galaxies are discovered in the Western halo of the nearby giant elliptical galaxy NGC 5128 at projected distances of ~100–225 kpc from their giant host.
Andrew Vanderburg et al 2018 AJ 156 184
The radial-velocity signal estimated for a candidate exomoon suggests that large exomoons around directly imaged planets orbiting bright, nearby stars may be detectable with current or next generation instrumentation.