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We study the effects of current systematic errors in Type Ia supernova (SNIa) measurements on dark energy (DE) constraints using current data from theSupernova Legacy Survey (SNLS). We consider how SN systematic errors affectconstraints from combined SN Ia, baryon acoustic oscillations (BAO), and cosmicmicrowave background (CMB) data, given that SNe Ia still provide the strongestconstraints on DE but are arguably subject to more significant systematics thanthe latter two probes. We focus our attention on the temporal evolution of DEdescribed in terms of principal components (PCs) of the equation of state,though we examine a few of the more common, simpler parametrizations as well.We find that the SN Ia systematics degrade the total generalized figure ofmerit (FoM), which characterizes constraints in multi-dimensional DE parameterspace, by a factor of two to three. Nevertheless, overall constraints obtainedon more than five PCs are very good even with current data and systematics. Wefurther show that current constraints are robust to allowing for the finitedetection significance of the BAO feature in galaxy surveys.

Principal components of dark energy with SNLS supernovae: the effects of systematic errors