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W. M. Wood-Vasey (Harvard/CfA), A. Clocchiatti (PUC), S. Jha (UC Berkeley), G. Miknaitis (Fermilab; U of Washington), G. Pignata (PUC), A. Rest (CTIO), C. W. Stubbs (Harvard/CfA), ESSENCE Collaboration
We present and discuss the photometric measurements and analysis of SN Ia light curves from the first 3 years of the ESSENCE project. We have used and verified multiple photometric packages to thoroughly understand and cross-check our photometry. Using both deep-template and NN2-based frame-subtraction methods to achieve high signal-to-noise ratio lightcurves, we detail the complementarity of both approaches in minimizing systematics in the ESSENCE photometry. To understand our calibration of the relative luminosity distances to our SNe Ia, we compare the results of 3 different SN Ia lightcurve luminosity width-brightness packages: MLCS2k2, Dm15, and BATM.
This work is partially supported by grant AST-0443378 from the US National Science Foundation.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.