Betelgeuse's boiling surface uncovers a stubborn hotspot
TL;DR Summary
New ALMA observations reveal Betelgeuse’s boiling, irregular surface with an average temperature around 2300 K and a brightest hotspot about 800 K hotter than its surroundings. The hotspot appears in 2015 and 2023 data in nearly the same location, indicating a persistent feature lasting at least seven years and shedding light on deep convection, mass loss, and the star’s atmosphere as Betelgeuse—about 600 light-years away and ~800 solar radii—nears its eventual supernova (not imminent).
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