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Dust associated with various stellar sources in galaxies at all cosmic epochsremains a controversial topic, particularly whether supernovae (SNe) play animportant role in dust production. We report evidence of dust formation in thecold, dense shell behind the ejecta-circumstellar medium (CSM) interaction inthe Type Ia-CSM SN 2018evt three years after the explosion, characterized by arise in the mid-infrared (MIR) emission accompanied by an accelerated declinein the optical radiation of the SN. Such a dust-formation picture is alsocorroborated by the concurrent evolution of the profiles of the Ha emissionline. Our model suggests enhanced CSM dust concentration at increasingdistances from the SN as compared to what can be expected from the densityprofile of the mass loss from a steady stellar wind. By the time of the lastMIR observations at day +1041, a total amount of 1.2+-0.2x10^{-2} Msun of newdust has been formed by SN 2018evt, making SN 2018evt one of the most prolificdust factories among SNe with evidence of dust formation. The unprecedentedwitness of the intense production procedure of dust may shed light on theperceptions of dust formation in cosmic history.

Newly Formed Dust within the Circumstellar Environment of SNIa-CSM 2018evt