Jacob H. Hamer and Kevin C. Schlaufman 2019 AJ 158 190
Data from Gaia Data Release 2 indicates that hot-Jupiter hosts are, on average, younger than field stars — suggesting that tidal interactions cause hot Jupiters to inspiral while their host stars are on the main sequence.
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%.