Travis A. Berger et al 2018 ApJ 866 99
Revised radii of 177,911 Kepler stars and their planets are calculated from Gaia DR2 data; ~67% of all Kepler targets are found to be main-sequence stars, ~21% subgiants, and ~12% red giants.
Elisabeth R. Newton et al 2018 AJ 156 217
Long-term, ground-based photometric monitoring from the MEarth Observatory is used to measure 234 rotation periods for nearby, southern hemisphere M dwarfs, including exoplanet hosts like Proxima Centauri.
Valeria Korol et al 2018 ApJL 866 L20
Between a dozen to several tens of double white dwarf binaries should be above the nominal detection threshold for LISA in neighboring galaxies within the Local Group, for a mission duration between 4 and 10 years.
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.