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Betelgeuse is the nearest Red Supergiant star and it underwent an unusuallydeep minimum at optical wavelengths during its most recent pulsation cycle. Wepresent submillimetre observations taken by the James Clerk Maxwell Telescopeand Atacama Pathfinder Experiment over a time span of 13 years including theoptical dimming. We find that Betelgeuse has also dimmed by \sim20\% at theselonger wavelengths during this optical minimum. Using radiative-transfermodels, we show that this is likely due to changes in the photosphere(luminosity) of the star as opposed to the surrounding dust as was previouslysuggested in the literature.

Betelgeuse fainter in the sub-millimetre too: an analysis of JCMT and APEX monitoring during the recent optical minimum