Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21110503s&link_type=abstract
American Astronomical Society, AAS Meeting #211, #105.03; Bulletin of the American Astronomical Society, Vol. 39, p.928
Mathematics
Logic
Scientific paper
Individual BVRI light-curve templates have been determined for 22 unusually well-observed literature Type Ia supernovae by the newly developed template builder AQUAA. This tool uses light-curve functions that are smooth, flexible, and free of potential bias from externally derived templates and other prior assumptions. In the B filter, to high accuracy 19 of these light curves may be represented by a single master template that is stretched adaptively along the time axis. The usual parameter describing average linear stretch is supplemented by two new nonlinear parameters that characterize transitions between regions of different time dilation. The distribution of these parameter values is related to the observed diversity of supernova rise times (Strovink, M., ApJ in press, astro-ph/07050726). Major portions of the VRI light curves, including the pre-maximum and peak regions, may be represented by corresponding master templates that similarly are stretched. When the dependence of absolute supernova luminosity on the limited number of stretch parameters is established, the use of Type Ia supernovae as cosmological distance indicators will be simplified and may be sharpened.
This work is supported by the Director, Office of Science, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
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