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Core-collapse supernovae (CC SNe), especially those of type II-plateau(II-P), are thought to be important contributors to cosmic dust production. Themost obvious indicator of the presence of newly-formed and/or pre-existing dustis the time-dependent mid-infrared (MIR) excess coming from the environment ofSNe. Our goal was to collect publicly available, previously unpublishedmeasurements on type II-P (or peculiar IIP) SNe from the Spitzer database. Thetemporal changes of the observed fluxes may be indicative of the underlyingsupernova, while spectral energy distribution (SED) fitting to the fluxes indifferent IRAC channels may reveal the physical parameters of the mid-IRradiation, presumably due to warm dust. IRS spectra were extracted andcalibrated with SPICE, while photometric SEDs were assembled using IRAF andMOPEX. Calculated SEDs from observed fluxes were fit with simple dust models toget basic information on the dust presumed as the source of MIR radiation. Wefound twelve SNe satisfying the criterion above, observed at late-time epochs(typically after +300 days). In three cases we could not identify any pointsource at the SN position on late time IRAC images. We found two SNe, 2005adand 2005af, which likely have newly-formed dust in their environment, while inthe other seven cases the observed MIR flux may originate from pre-existingcircumstellar or interstellar dust. Our results support the previousobservational conclusions that warm new dust in the environment of SNecontributes only marginally to cosmic dust content.

Twelve type II-P supernovae seen with the eyes of Spitzer