Physics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009noao.prop..201a&link_type=abstract
NOAO Proposal ID #2009B-0201
Physics
Scientific paper
We propose to continue our Gemini/GMOS image and spectral observations of three bright Type II SNe (2007it, 2007oc, 2007od) as part of a unique detailed study of dust formation of SNe at visible, near- and mid-IR wavelengths. Gemini time for semester 2009B has already been approved as part of a joint Hubble/NOAO Cycle 17 proposal. These new observations will be combined with already approved 2008A&B and 2009A Gemini/GMOS, and Spitzer Cycle 5 (priority 1) programs. Because all three SNe were so unusually bright at discovery (V 13.5 mag), we should be able to follow their evolution for at least two years. This is very important because dust typically condenses in the SN ejecta approximately 300-600 days after the initial explosion. Spectra and images of 2007it and 2007oc will be obtained once in 2009B, at the start of the semester ( 720 and 630 days respectively). 2007od observations will be obtained twice in 2009A, in August ( 650 days) and then again in September ( 680 days). We have previously shown using Gemini and Spitzer that monitoring the evolution of H-alpha and [O I] emission-line profiles, g'r'i photometry, and IR emission in Type II SNe are very sensitive techniques for detecting new dust forming in the ejecta. We hope that the unique combination of coordinated Gemini, Spitzer and HST data obtained during the dust forming period will answer the perplexing questions concerning when and how much dust is produced by Type II SNe. Our radiative transfer codes will be used to model these observations, allowing us to investigate the clumpiness of dust in the ejecta and better estimate the total mass of dust. The results will have important implications for the evolution of dust-rich galaxies at high redshift (z 6) where young high-mass stars may be significant dust producers.
Andrews Jennifer
Barlow Mike
Clayton Geoffrey
Gallagher Joseph
Meixner Margaret
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