A. Pusack et al 2021 Planet. Sci. J. 2 186
Observations of the inner solar system by Parker Solar Probe suggest that there may be an additional population of particles making up zodiacal dust, potentially associated with the Geminids meteoroid stream.
Norita Kawanaka and Shiu-Hang Lee 2021 ApJ 917 61
The material surrounding a supernova affects the energies of escaping cosmic rays, with interstellar-medium-like surroundings producing “softer” secondary cosmic rays and wind-like surroundings producing “harder” secondary cosmic rays.
Paulina Sowicka et al 2021 ApJL 918 L1
The existence of a previous very late thermal pulse, revealed by the presence of nitrogen, may solve the mystery of why only half of GW Vir stars — the hottest pulsating white dwarfs — actually pulsate.
Maïssa Salama et al 2021 AJ 162 102
An infrared survey with the goal of directly imaging substellar companions yields 121 companion candidates, with five potential substellar companions highlighted for followup.
Stefano Pantaleone et al 2021 ApJ 917 49
New simulations of how H2 molecules form on icy grains may solve a persistent mystery of how another common molecule — CO — winds up in gaseous form in molecular clouds.
Peter Gao and Diana Powell 2021 ApJL 918 L7
The shaded night-side hemispheres of hot Jupiters appear to contain silicate compounds, which may produce spectral features strong enough to be observed with future space telescopes.