Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21711202a&link_type=abstract
American Astronomical Society, AAS Meeting #217, #112.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
Detection of large amounts of dust in high redshift galaxies suggest that core collapse supernovae (CCSNe) may play an important role in the dust budget of the universe. At an age of only 1Gyr, there has not been enough time for low-mass stars to form and evolve to the asymptotic giant branch, but there has been sufficient time for CCSNe, which quickly evolve and return their material to the surrounding interstellar medium. For the past three years, I have been following the Type IIP SNe 2007it and 2007od with Gemini, HST, and Spitzer to look for indicators of dust formation, which appear within the first few years of discovery. The data obtained have significant temporal and wavelength coverage, and the SNe show unusual and interesting characteristics. In both cases we are seeing evidence of CSM interaction in their spectral evolution, although neither was initially classified as a Type IIn. We found SN 2007it to be oxygen rich with 56Ni masses quite large for a Type IIP, while SN 2007od is oxygen poor with a very low 56Ni mass. Light echoes also seem to be present in both SNe. We estimate 10-4 Msun of dust has formed in each SN, consistent with other CCSNe, but still smaller than needed to account for the amount of dust seen at high redshift.
This work has been supported by NSF grant AST-0707691 and NASA GSRP grant NNX08AV36H. This work was supported by Spitzer Space Telescope RSA 1415602 and RSA 1346842, both issued by JPL/Caltech.
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