Noé Brucy et al 2020 ApJL 896 L34

Models show that stellar feedback is not sufficient to regulate star formation in gas-rich high-redshift galaxies, but external driving of turbulence could further reduce the star formation rate to that observed.

Elia Leibowitz 2020 ApJ 896 74

Periodic modulation of Sgr A*’s X-ray and near-infrared flaring activity can be interpreted as due to a close-in (within 3–3.5 Schwarzschild radii of the black hole) star on a slightly elliptical precessing orbit.

W. F. Bottke et al 2020 AJ 160 14

Empirically derived asteroid crater scaling laws suggest crater retention ages of ~1 Gyr for Bennu, Ryugu, and Itokawa and ~2.5 Gyr for Toutatis, agreeing with the estimated formation ages of their source families.

Amir Siraj and Abraham Loeb 2020 ApJL 895 L42

Supernova dust grains can form detectable tracks with widths of ~0.01–0.07 μm and depths of ~0.1–0.7 mm in lunar rocks, potentially revealing timings, directions, and luminosities of nearby supernovae.

Adam Ginsburg et al 2020 ApJS 248 24

A survey of the galactic plane at 3 mm with the Green Bank Telescope, which will measure the gas and dust involved in star formation, has now launched with a pilot program that detected 709 sources over 7 fields.

Vivienne F. Baldassare et al 2020 ApJ 896 10

PTF detection of optical variability in 417 active nuclei of nearby galaxies, including 237 with stellar masses between 10⁷ and 10¹⁰ M_⊙, reveals no dependence of variability properties with stellar mass.