Yuhito Shibaike et al 2019 ApJ 885 79

A new scenario — which well reproduces observations — is hypothesized for the origin of Jupiter’s Galilean system, based on the capture of several planetesimal seeds and subsequent slow accretion of pebbles.

Hu Zou et al 2019 ApJS 245 4

The Beijing–Arizona Sky Survey, a wide and deep optical imaging survey covering a 5400 deg² area, aims to provide galaxy and quasar targets for follow-up by the Dark Energy Spectroscopic Instrument.

Yutaka Hirai et al 2019 ApJ 885 33

New simulations demonstrate that neutron-star mergers, asymptotic giant branch stars, electron-capture supernovae, and rotating massive stars all play roles in the enrichment histories of Local Group dwarf galaxies.

Michael W. Coughlin et al 2019 ApJL 885 L19

Even with single-detector gravitational-wave events localized to thousands of square degrees, systematic kilonova discovery is feasible with follow-up campaigns with telescopes like ZTF and Palomar Gattini-IR.

Frédérique Baron et al 2019 AJ 158 187

Based on direct-imaging observations of a sample of 344 stars in nearby young associations, the occurrence rate for companions with masses of 1–20 Jupiter masses in the range of 5–5000 AU is ~11%.

Kyle Kremer et al 2019 ApJ 885 2

N-body models show that 10%–50% of primordial planetary systems in dense star clusters can be broken through dynamical encounters over a cluster’s full lifetime, populating clusters with “free-floating” planets.