Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 772, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/772/1/L6
Keywords
circumstellar matter; dust, extinction; infrared: stars; supernovae: general; supernovae: individual (SN 2002ic, SN 2005gj)
Categories
Funding
- NASA through JPL/Caltech [P90031]
- Christopher R. Redlich Fund
- TABASGO Foundation
- NSF [AST-1211916]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1211916] Funding Source: National Science Foundation
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A growing number of observations reveal a subset of Type Ia supernovae undergoing circumstellar interaction (SNe Ia-CSM). We present unpublished archival Spitzer Space Telescope data on SNe Ia-CSM 2002ic and 2005gj obtained > 1300 and 500 days post-discovery, respectively. Both SNe show evidence for late-time mid-infrared (mid-IR) emission from warm dust. The dust parameters are most consistent with a preexisting dust shell that lies beyond the forward-shock radius, most likely radiatively heated by optical and X-ray emission continuously generated by late-time CSM interaction. In the case of SN 2005gj, the mid-IR luminosity more than doubles after 1 yr post-discovery. While we are not aware of any late-time optical-wavelength observations at these epochs, we attribute this rebrightening to renewed shock interaction with a dense circumstellar shell.
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