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A growing number of observations reveal a subset of Type Ia supernovaeundergoing circumstellar interaction (SNe Ia-CSM). We present unpublishedarchival Spitzer Space Telescope data on SNe Ia-CSM 2002ic and 2005gj obtained> 1300 and 500 days post-discovery, respectively. Both SNe show evidence forlate-time mid-infrared (mid-IR) emission from warm dust. The dust parametersare most consistent with a pre-existing dust shell that lies beyond theforward-shock radius, most likely radiatively heated by optical and X-rayemission continuously generated by late-time CSM interaction. In the case of SN2005gj, the mid-IR luminosity more than doubles after 1 year post-discovery.While we are not aware of any late-time optical-wavelength observations atthese epochs, we attribute this rebrightening to renewed shock interaction witha dense circumstellar shell.

The Late-Time Rebrightening of Type Ia SN 2005gj in the Mid-Infrared