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B.E.K. Sugerman (STScI), SEEDS Collaboration
The SEEDS collaboration (Survey for Evolution of Emission from Dust in Supernovae) is currently carrying out a sensitive mid-infrared (IR) survey to address the extent to which SNe produce dust, and whether they are a primary source of dust in the Universe. We present mid-infrared (IR) observations of two interesting, recent supernovae (SNe): SN 2002hh in NGC 6946, and SN 2003gd in M74. (1) Mid-IR emission from SN 2002hh detected in mid-2004 suggested the source was a pre-existing shell of circumstellar dust, however the evolution of that emission suggests it is evolving similarly to SN 1987A. We present updated photometry and mid-IR spectra, and discuss constraints on whether dust also formed within its ejecta. (2) SN 2003gd in M74 has already been shown to demonstrate asymmetric emission lines and a 1.5-mag increase in extinction with time, both of which suggest dust is condensing within the ejecta. We report its mid-IR detection, and show that its SED is well fit by 500-K dust with a size consistent with expansion of the ejecta. We therefore believe dust condensed within its ejecta starting around 450 days after outburst, with the total dust mass currently estimated at 10-3 M\sun.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.