Ozge Ozgurel et al 2018 ApJL 865 L16

Models of metals’ journey through Europa’s ice are consistent with the assumption that sodium and potassium come from the sputtering of materials issued from its underlying ocean and exposed by resurfacing events.

Kelly A. Douglass et al 2018 ApJ 864 144

SDSS observations of ~1,500 dwarf galaxies suggest that the void environment has a slight influence on dwarf galaxy chemical evolution; void dwarfs have different chemical abundances than dwarfs in denser regions.

Frédérique Baron et al 2018 AJ 156 137

WEIRD survey results constrain the occurrence of 1–13 M_Jup planetary-mass companions on orbits with a semimajor axis between 1,000 and 5,000 AU at less than 0.03, with a 95% confidence level.

Eli Visbal and Zoltán Haiman 2018 ApJL 865 L9

Simulations suggest that high-redshift direct-collapse black holes will be distinguishable from smaller black-hole seeds due to the unusually high hlack-hole mass to stellar mass ratios of the faintest observed quasars.

Athanasios Papageorgiou et al 2018 ApJS 238 4

Data from the Catalina Sky Surveys is used to produce an updated catalog of 4,680 northern eclipsing binaries that have well-defined beginnings and ends of their primary and secondary eclipses (Algol-type).

Scott J. Kenyon et al 2018 ApJ 864 130

For typical hypervelocity stars ejected from the galactic center toward low (high) galactic latitudes, the disk bends trajectories by up to 30° (3°–10°); the Large Magellanic Cloud often produces similar deflections.