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.

M. Seiler et al 2019 ApJS 243 31

Numerical simulations show that libration of the central embedded moonlet in Saturn’s A ring leads to asymmetry in the propellor-shaped gaps caused by the orbit of the moonlet within the ring.

M. Schramm et al 2019 ApJ 881 145

SDSS J163909+282447.1, a luminous quasar at z = 3.84 with an extremely massive for a supermassive black hole (2.5 × 10¹⁰ M_⊙), is measured to have a stellar mass that’s a factor of at least ~16 less than expected.

R. A. Street and E. Bachelet 2019 AJ 158 110

Now that its primary mission is concluded, the New Horizons spacecraft’s LORRI imager could be used to observe microlensing events in the galactic bulge, possibly providing constraints on lens properties.

Pawel Pietrukowicz et al 2019 ApJL 881 L41

OGLE-UCXB-01, a 12.8 minute variable object located in the galactic bulge globular cluster Djorg 2, is shown to be a likely ultracompact X-ray binary system exhibiting a fast period decrease as its orbit decays.

Khyati Malhan et al 2019 ApJ 881 106

The GD-1 stellar stream has a secondary diffuse, extended stellar component around it, supporting the idea that its progenitor was originally formed outside of the Milky Way in a now defunct dark satellite galaxy.