The Unusual Supernova 1978K and Dust Formation

Details The Unusual Supernova 1978K and Dust Formation The Unusual Supernova 1978K and Dust Formation

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21741003v&link_type=abstract

American Astronomical Society, AAS Meeting #217, #410.03; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

We cannot yet explain why galaxies at high redshift, early in the history of the Universe, show appreciable dust content. Various models have introduced the possibility that core-collapse supernovae (SNe) from early stars may be the main contributors of the dust. Recently, particularly with the Spitzer Space Telescope, several investigations have attempted to determine whether or not SNe, based on nearby events, produce enough dust to match the model predictions. So far, the results have not been promising, but the SNe have generally been from relatively low-mass progenitors. Analysis of the dust content in the young Galactic supernova remnant Cas A, which may have had a high-mass progenitor, has indicated that possibly enough dust has been freshly formed to be in agreement with the lower limits of these models. This indicates potentially that SNe from high-mass stars could be adequate dust producers. The unusual, nearby SN 1978K in NGC 1313 is another excellent case to examine for dust production, since many indicators point to this SN having had a very massive stellar progenitor. SN 1978K has been observed with Spitzer with all cryogenic instruments, and here we present our data analysis, particularly of the IRS spectra, and estimate the dust properties and mass associated with this object.

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