Ariadna Murguia-Berthier et al 2020 ApJL 901 L24
A few percent of single O-type stars with measured rotational velocities are expected to spin slowly enough at the end of their lifetimes that they will collapse directly into a black hole without producing a visible signal.
Fabo Feng et al 2020 ApJS 250 29
New analysis of M-dwarf radial velocity data reveals 10 strong and 3 weak new planet candidates. The wide orbits of these candidates make them ideal targets for direct-imaging followup.
Maciek Wielgus et al 2020 ApJ 901 67
Prototype Event Horizon Telescope array observations of the supermassive black hole at the center of M87 show persistence of the ~40-µas-diameter, bright, asymmetric ring throughout 2009–2017.
Armen Tokadjian and Anthony L. Piro 2020 AJ 160 194
Tidal models applied to known exoplanet systems show that there are at least 36 systems in which an exoplanet in the habitable zone may host an exomoon for longer than one gigayear.
Manasvi Lingam and Abraham Loeb 2020 ApJL 901 L11
Models indicate that the maximum biomass that might be sustainable in deep subsurface environments might be roughly three orders of magnitude smaller than Earth’s global biomass, under ideal circumstances.
Scott J. Kenyon and Benjamin C. Bromley 2020 Planet. Sci. J. 1 40
According to new modeling, New Horizons’s crater counts on Pluto’s moon Charon match the frequencies expected from collisional cascades of solids with bulk strength intermediate between weak and normal ice.