Sophie L. Schrøder et al 2018 ApJL 862 L3

Simulations show that when a helium-star-descended black hole is formed in a failed supernova explosion, the spin of the black hole is primarily determined by the initial binary separation, not the supernova energy.

G. F. Burgio et al 2018 ApJ 860 139

Observations of the neutron-star merger GW170817 have ruled out some equations of state for dense matter, due to upper and lower limits that have been placed on average tidal deformability.

Peter Vereš et al 2018 AJ 156 5

Of roughly 3,000 unconfirmed near-Earth asteroid (NEA) candidates discovered 2013-2016, nearly 1,000 of them are likely to be NEAs; delayed submission, high rates of motion, and other factors prevented their recovery.

Cécile Favre et al 2018 ApJL 862 L2

The two-oxygen-atom organic molecule formic acid has been detected toward the TW Hydrae protoplanetary disk, providing proof that organic chemistry is very active, albeit difficult to observe, in such objects.

Dale D. Kocevski et al 2018 ApJS 236 48

The publicly available X-UDS survey results, obtained with Chandra, suggest that the intrinsic Compton-thick active galactic nucleus fraction is 30%–35% over a wide range in redshift (z = 0.1–3).

Ryan Lynch et al 2018 ApJL 861 L24

Changing the GW-alert threshold to roughly double the number of detectable astrophysical events would increase the false-alarm rate by 5+ orders of magnitude — from 1 per 100 years to more than 1000 per year.