Benjamin J. S. Pope et al 2019 ApJS 245 8

Via analysis of the unsaturated scattered-light “halo” around the stars that saturated the Kepler detector, precise light curves are retrieved for of most of the brightest stars in K2 fields from Campaign 4 onward.

José G. Fernández-Trincado et al 2019 ApJL 886 L8

A unique collection of metal-poor giant stars that exhibit anomalously high levels of ²⁸Si have been found in the Milky Way’s inner stellar halo, possibly pointing to a past accretion event.

Heather A. Elliott et al 2019 ApJ 885 156

New Horizons measurements show that the solar wind speed is reduced by 5%–7% between 30 and 43 AU relative to the speeds at 1 AU, as the wind encounters an increasing amount of interstellar material.

Chayan Mondal et al 2019 AJ 158 229

Far-ultraviolet imaging of the nearby dwarf irregular galaxy IC 2574 indicates that star formation in the galaxy is partly triggered due to expanding H I holes, but in most sites, it’s driven by other mechanisms.

C. Simpson et al 2019 ApJ 885 133

In the next stage of the Super-Kamiokande experiment, gadolinium sulfate will be added to the particle detector, potentially making it sensitive enough to be able to provide pre-explosion warnings for core-collapse supernovae.

Christina Kay et al 2019 ApJL 886 L37

Modeling based on the observationally reconstructed magnetic field of the 0.7 Gyr young Sun’s twin, k ¹ Ceti, suggests that coronal mass ejections tend to propagate within a small cone about the ecliptic plane.