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Circumstellar dust is formed and evolved within the envelope of evolvedstars, including Asymptotic Giant Branch (AGB) and Red Supergiant (RSG). Theextinction of stellar light by circumstellar dust is vital for interpretingRSG/AGB observations and determining high-mass RSG progenitors of core-collapsesupernovae. Nevertheless, circumstellar dust properties are not wellunderstood. Modern understanding of dust evolution suggests that intensestellar radiation can radically change the dust properties across thecircumstellar envelope through the RAdiative Torque Disruption (RAT-D)mechanism. In this paper, we study the impacts of RAT-D on the grain sizedistribution (GSD) of circumstellar dust and model its effects on photometricobservations of $\alpha$ Orionis (Betelgeuse). Due to the RAT-D effects, largegrains formed in the dust formation zone are disrupted into smaller species ofsize $a < 0.5\,\rm\mu m$. Using the GSD constrained by the RAT-D effects, wemodel the visual extinction of background stars and Betelgeuse. We find thatthe extinction decreases at near-UV, optical, and infrared wavelengths whileincreasing at far-UV wavelengths. The resulting flux potentially reproduces theobservation from the near-UV to near-IR range. Our results can be used toexplain dust extinction and photometric observations toward other RSG/AGBstars.

Modeling extinction and reddening effects by circumstellar dust in the Betelgeuse envelope in the presence of radiative torque disruption