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Supernovae are important probes of the properties of stars at high redshiftsbecause they can be detected at early epochs and their masses can be inferredfrom their light curves. Finding the first cosmic explosions in the universewill only be possible with the James Webb Space Telescope, the Wide-FieldInfrared Survey Telescope and the next generation of extremely largetelescopes. But strong gravitational lensing by massive clusters, like those inthe Cluster Lensing and Supernova Survey with Hubble (CLASH), could reveal suchevents now by magnifying their flux by factors of 10 or more. We find thatCLASH will likely discover at least 2 - 3 core-collapse supernovae at 5 < z <12 and perhaps as many as ten. Future surveys of cluster lenses similar inscope to CLASH by the James Webb Space Telescope might find hundreds of theseevents out to z ~ 15 - 17. Besides revealing the masses of early stars, theseancient supernovae will also constrain cosmic star formation rates in the eraof first galaxy formation.

Detecting Ancient Supernovae at z ~ 5 - 12 with CLASH