Klaus M. Pontoppidan et al 2020 ApJ 896 169
New near-infrared imaging of the great disk shadow in the Serpens star-forming region demonstrate strong variability of the disk shadow, revealing dynamics of the inner disk on timescales of months.
David Jewitt et al 2020 ApJL 896 L39
Hubble observations of interstellar comet 2I/Borisov reveal an outburst and splitting of the comet’s nucleus, likely ejecting one or more meter-sized boulders that nonetheless made up a small fraction of the comet’s mass.
Thomas M. Esposito et al 2020 AJ 160 24
A ~4-year direct imaging survey of 104 stars resulted in 26 debris disks and 3 protoplanetary/transitional disks being resolved in scattered light — 7 for the first time — and characterized.
V. A. Acciari et al 2020 ApJS 248 29
Observations of the TeV blazar Mrk 421 during flaring activity show energy-dependent variability on multi-hour timescales and energy-independent variability on sub-hour timescales, favoring a multi-zone scenario.
Yong Zheng et al 2020 ApJ 896 143
Synthetic observations of simulated Milky Way analogs demonstrate and quantify multiple observational biases that are at play when we study the Milky Way’s circumgalactic medium.
Matija Ćuk et al 2020 Planet. Sci. J. 1 22
Simulations of the past tidal evolution of the Uranian system suggest that the most recent major mean–motion resonance between two large moons, Ariel and Umbriel, greatly influenced the system’s current confirguration.