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.

Ryan Cloutier et al 2020 AJ 160 3

TESS has discovered two new transiting planets that span the radius valley in period–radius space around low-mass stars —an excellent laboratory to test competing theories of the emergence of the radius valley.

Olivier Mousis et al 2020 ApJL 896 L22

New models suggest that some sub-Neptune planets may just be water-rich super-Earths; their large radii could be caused by the inflation of supercritical water envelopes by irradiation combined with the greenhouse effect.

Benjamin Boe et al 2020 ApJ 895 123

The topology of the coronal magnetic field is mapped continuously between 1 and 6 R_⊙ using a combination of 14 unique eclipse coronae that span almost two complete solar cycles.

Matthew S. Clement et al 2020 Planet. Sci. J. 1 18

GPU-accelerated, direct N-body simulations of embryo growth starting from r ~ 100 km planetesimals provide realistic initial conditions for terrestrial accretion models that explore the birth of the solar system’s inner planets.

Daniel Stern and Dominic J. Walton 2020 ApJL 895 L38

Archival Keck data are used to identify for the first time, from a detected emission line, the spectroscopic redshift for the source gravitationally lensed into the first Einstein ring ever detected: MG 1131+0456.