Dust Production in Type II Supernovae

Details Dust Production in Type II Supernovae Dust Production in Type II Supernovae

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21110523a&link_type=abstract

American Astronomical Society, AAS Meeting #211, #105.23; Bulletin of the American Astronomical Society, Vol. 39, p.932

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Scientific paper

Recent detection of large amounts of dust in high red-shift galaxies has led to an increased interest in the importance of Type II supernovae (SNe) as dust producers. The dust in high-z galaxies must come from young, massive stars so Type II SNe could be potential sources. We are observing SNe in nearby galaxies for the three observational signatures of dust formation. This includes a decrease in the continuum brightness in the visible, a developing infrared excess, and asymmetric, blue-shifted emission- line profiles. These indicators usually appear around 300-600 days after the SN explosion, unfortunately when the brightness of the SN has diminished considerably. But with the launch of Spitzer, along with the use of other large sensitive land based telescopes, more late-time data have become available, and there is evidence of dust forming in the ejecta of at least four SNe to date. Others show possible indicators of dust formation, and with continuing observations we hope to find that this is a common, though difficult to detect, occurrence. For the last four years, we have been observing numerous Type II SNe (including SN's 2004et, 2006bc, 2006co, and 2006ci) at various wavelengths with Gemini, Spitzer, and HST with positive results, and will continue these observations in the coming year in hopes of increasing the known number of dust producing SNe.
This project is being supported by NSF grant AST-0707691.

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