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.
Bin Ren et al 2019 ApJ 882 64
Hubble and Gemini scattered-light images of the HD 191089 debris disk reveal two components: a ring resembling the Kuiper Belt in radial extent (~25 AU in width, centered at 46 AU) and a halo extending to ~640 AU.
Imke de Pater et al 2019 AJ 158 139
ALMA observations probing below the ammonia cloud deck of Jupiter show that the erupting plumes in the South Equatorial Belt bring up ammonia gas from the deep atmosphere.
B. P. Abbott et al 2019 ApJL 882 L24
Models based on the 10 binary black hole mergers detected by LIGO/Virgo in its first two observing runs indicate a black hole binary merger rate density of R = 53.2 (-28.2 +55.8) per cubic Gpc per year.
J. Pavan and A. F. Viñas 2019 ApJ 882 28
New modeling suggests that fluctuations of temperature at the Sun might play a key role in shaping solar wind velocity distributions via large-scale ambipolar electric field.