The Great Dimming of Betelgeuse is still eliciting papers on what caused it, such as this one submitted to the MNRAS. The title asks “Did a close tidal encounter cause the Great Dimming of Betelgeuse?” and although the answer (spoiler alert!) seems to be “probably not”, it’s still an interesting read.
Thanks for the link Jeremy. Yet another recent one (with somewhat more enlightening conclusions regarding RSG mass-loss mechanisms) is from Roberta Humphreys and Terry Jones at UMinn. It can be found at: https://arxiv.org/abs/2201.07818
This includes discussion of Betelgeuse and comparisons with the hypergiant VY CMa.
Analysis of photometric and spectroscopic variability of red supergiant Betelgeuse
Daniel Jadlovsky, Jiri Krticka, Ernst Paunzen, Vladimir Stefl https://arxiv.org/abs/2211.04380
The second paper says that after the Dimming, the Betelgeuse mode of variability has fundamentally changed and is now instead following a shorter period of ∼200d (cf ~400+d, plus several longer periods, in previous epochs)