Abstract

Over the last two decades, high-cadence rolling surveys (e.g., PS1 , ZTF, ATLAS ) have given us large statistical samples of supernovae (SNe) and other transients in the low-z range up to redshifts of 1. With JWST , going deeper and redder, we can now expand transient astronomy into the early, high-z universe. Such unique observation on high-z transients offers us a direct approach for probing the IMF at high-z, the epoch of reionization, as well as exploring the cosmological expansion history. Those sample can also provide insights into the rare types of transients (e.g., Pair-Instability SNe and Superluminous SNe) and could deepen our understanding in high energy physics and explosion mechanisms underneath. I will discuss our recent discovery of more than 100 SNe up to z~5 with the JADES and COSMOS project, their spectroscopic follow-up, and what we can expect in the future with both JWST and Roman.