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.

M. Ajello et al 2019 ApJ 878 52

The second catalog of gamma-ray bursts detected with Fermi’s Large Area Telescope is released, covering the first 10 years of operations and including 186 gamma-ray bursts.

Valentin Christiaens et al 2019 ApJL 877 L33

Observations with the Very Large Telescope have revealed evidence for a circumplanetary disk surrounding the protoplanet PDS 70 b (even as ALMA observations have recently indicated a similar disk around PDS 70 c).