Sebastián Pérez et al 2019 AJ 158 15

Computer simulations suggest that the star HD 169142, which hosts a prominent circumstellar disk separated into distinctly observed rings, may be orbited by a migrating low-mass planet that has shaped its disk.

Elise Servajean et al 2019 ApJ 878 146

ALMA observations reveal twelve compact structures — dense cores — within the massive, dense, cold clump G305.137+0.069; these cores can be explained as the result of fragmentation in a collapsing clump.

Jordi Isern 2019 ApJL 878 L11

Observations of massive white dwarfs in the solar neighborhood allow us to reconstruct the history of the local star formation rate, which peaked once 6–7 Gyr ago, peaked again 2–3 Gyr ago, and has declined since then.

Eve J. Lee 2019 ApJ 878 36

In the inner regions of planetary systems, with a finite protoplanetary disk lifetime of ~10 Myr, massive cores (>10 M_⊕) can become either gas-poor super-Earths or gas-rich Jupiters depending on when they assemble.

Irina S. Proshina et al 2019 AJ 158 5

Observations of abundances in five lenticular galaxies with UV-bright, star-forming outer rings suggest that the gas of the rings was recently accreted, igniting a burst of star formation.

Fabo Feng et al 2019 ApJS 242 25

An automated detection method is used to analyze radial-velocity data from the Planet Finder Spectrograph, revealing 15 planet candidates located in 14 stellar systems and demonstrating the feasibility of this approach.