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Using three magnified Type Ia supernovae (SNe Ia) detected behind CLASHclusters, we perform a first pilot study to see whether standardizable candlescan be used to calibrate cluster mass maps created from strong lensingobservations. Such calibrations will be crucial when next generation HSTcluster surveys (e.g. FRONTIER) provide magnification maps that will, in turn,form the basis for the exploration of the high redshift Universe. We classifySNe using combined photometric and spectroscopic observations, finding two ofthe three to be clearly of type SN Ia and the third probable. The SNe exhibitsignificant amplification, up to a factor of 1.7 at $\sim5\sigma$ significance(SN-L2). We conducted this as a blind study to avoid fine tuning of parameters,finding a mean amplification difference between SNe and the cluster lensingmodels of $0.09 \pm 0.09^{stat} \pm 0.05^{sys}$ mag. This impressive agreementsuggests no tension between cluster mass models and high redshift standardizedSNe Ia. However, the measured statistical dispersion of $\sigma_{\mu}=0.21$ magappeared large compared to the dispersion expected based on statisticaluncertainties ($0.14$). Further work with the supernova and cluster lensingmodels, post unblinding, reduced the measured dispersion to$\sigma_{\mu}=0.12$. An explicit choice should thus be made as to whether SNeare used unblinded to improve the model, or blinded to test the model. As thelensed SN samples grow larger, this technique will allow improved constraintson assumptions regarding e.g. the structure of the dark matter halo.

Lensed Type Ia Supernovae as Probes of Cluster Mass Models