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We present a new, detailed analysis of late-time mid-infrared (IR)observations of the Type II-P supernova (SN) 2003gd. At about 16 months afterthe explosion, the mid-IR flux is consistent with emission from 4 x 10^(-5)M(solar) of newly condensed dust in the ejecta. At 22 months emission frompoint-like sources close to the SN position was detected at 8 microns and 24microns. By 42 months the 24 micron flux had faded. Considerations ofluminosity and source size rule out the ejecta of SN 2003gd as the main originof the emission at 22 months. A possible alternative explanation for theemission at this later epoch is an IR echo from pre-existing circumstellar orinterstellar dust. We conclude that, contrary to the claim of Sugerman et al.(2006, Science, 313, 196), the mid-IR emission from SN 2003gd does not supportthe presence of 0.02 M(solar) of newly formed dust in the ejecta. There is, asyet, no direct evidence that core-collapse supernovae are major dust factories.

A Spitzer Space Telescope Study of SN 2003gd: Still No Direct Evidence that Core-Collapse Supernovae are Major Dust Factories