Superflares on solar-type stars from the first year observation of TESS
https://arxiv.org/abs/1912.11572
Long-lived Dust Rings around HD 169142
https://iopscience.iop.org/article/10.3847/2041-8213/ab5c87
Exoplanet Imitators: A Test of Stellar Activity Behavior in Radial Velocity Signals
https://iopscience.iop.org/article/10.3847/1538-3881/ab53ec