Uranus’s Hidden Narrow Rings
Matthew Hedman and Rob Chancia 2021 Planet. Sci. J. 2 107
New analysis of the highest-resolution Voyager images of Uranus’s dusty ring system reveals that a number of these rings are less than 20 km wide.
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The Gas Content and Stripping of Local Group Dwarf Galaxies
Mary E. Putman et al 2021 ApJ 913 53
Measurements of the 119 Local Group dwarf galaxies show that 53 of 55 dwarfs within the Milky Way’s virial radius are devoid of gas, and 27 of 30 beyond the virial radius are stripped as well.
The Breakthrough Listen Search for Intelligent Life: Searching for Technosignatures in Observations of TESS Targets of Interest
Raffy Traas et al 2021 AJ 161 286
The Breakthrough Listen search for extraterrestrial intelligence is extended to include targeted searches of stars identified by TESS as potential exoplanet hosts, establishing deep limits on SETI over the 1–11 GHz band.
Evidence for TiO in the Atmosphere of the Hot Jupiter HAT-P-65 b
Guo Chen et al 2021 ApJL 913 L16
Low-resolution transmission spectra of the puffy hot Jupiter HAT-P-65b reveal evidence for titanium oxide in this planet’s relatively clear atmosphere.
Star–Gas Misalignment in Galaxies. II. Origins Found from the Horizon-AGN Simulation
Donghyeon J. Khim et al 2021 ApJS 254 27
Simulations point to 4 channels that generate misalignment of the stars and gas in galaxies: mergers (35%), interaction with nearby galaxies (23%), interaction in dense environments (21%), and secular evolution (21%).
Dione’s Wispy Terrain: A Cryovolcanic Story?
Cristina M. Dalle Ore et al 2021 Planet. Sci. J. 2 83
Examination of the H2O ice phase on the surface of Dione, one of Saturn’s icy satellites, supports the hypothesis that Dione might have been recently active and is still harboring a body of liquid water under its crust.