AAS 207th Meeting, 8-12 January 2006
Session 171 Supernovae
Poster, Thursday, 9:20am-4:00pm, January 12, 2006, Exhibit Hall

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[171.18] Do Supernovae Produce Dust? New SEEDS Results on SNe 2002hh and 2003gd

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
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