John H. Debes et al 2019 ApJL 872 L25

A recent citizen-scientist discovery suggests that large-scale tidal disruption events can still occur around white dwarfs 3 billion years after the white dwarf’s formation — much later than was previously thought.

Adam Ginsburg et al 2019 ApJ 872 54

ALMA observations revealed NaCl, KCl, and their ³⁷Cl and ⁴¹K isotopologues in the high-mass protostellar disk around Orion SrcI, tracing the region just above the continuum disk and possibly forming the base of the outflow.

Edward F. Schlafly et al 2019 ApJS 240 30

The unWISE Catalog, which contains the positions and fluxes of ~2 billion objects observed by WISE over the full sky, improves on the AllWISE catalog with deeper imaging and improved modeling of crowded regions.

P. Kharb et al 2019 ApJ 871 249

VLBI observations of the Seyfert type 2 galaxy KISSR 434 reveal a long (~500 light-years) jet that is curved, possibly due to precession rather than ram-pressure bending from a rotating interstellar medium.

Steven Villanueva Jr. et al 2019 AJ 157 84

Semianalytic estimates predict 241 single-transit events caused by planets will be detectable in TESS postage-stamp images at a signal-to-noise ratio of S/N ≥ 7.3, and at least 977 more will be visible in the full frame images.

E. J. L. Larson 2019 ApJL 872 L23

The organic haze enshrouding Titan follows a seasonal cycle both due to Saturn’s orbital eccentricity and its 27° obliquity; simulations suggest the cycle is amplified by a factor of 2 with production as a function of solar UV.