Javier A. Ahumada et al 2019 ApJ 882 171
Gemini-South observations are used to identify four white dwarves in the centers of faint and extended planetary neubulae — stars that are likely the central ionizing sources of the nebulae.
Lucas A. Bignone et al 2019 ApJL 883 L5
A simulated Milky Way analog discovered in the EAGLE suite of cosmological hydrodynamical simulations may help us to understand the early evolutionary history of the Milky Way.
G. Zhou et al 2019 AJ 158 141
From a sample of bright main-sequence stars, 31 giant-planet candidates are found, suggesting a net hot Jupiter occurrence rate of 0.41 ± 0.10% that does not show statistically significant trends with stellar mass.
Jennifer O’Kane et al 2019 ApJ 882 85
A study of two stealth coronal mass ejections (CMEs) — eruptions from the Sun that have no obvious low coronal signature — suggests they are likely to be sympathetic CMEs triggered by a nearby eruption in the active region.
Cuihua Du et al 2019 ApJS 244 4
More than 600 high-velocity stars are identified in the Gaia DR2 data, including 28 nearby (less than 6 kpc) late-type hypervelocity stars with over a 99% possibility of being unbound.
Tuan Do et al 2019 ApJL 882 L27
Keck Telescope observations show that Sgr A* reached much brighter flux levels in 2019 than ever seen at near-infrared wavelengths, possibly indicating a period of heightened activity or a change in Sgr A*’s accretion state.