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We present the discovery of a Type Ia supernova (SN) at redshift $z = 1.914$from the CANDELS multi-cycle treasury program on the \textit{Hubble SpaceTelescope (HST)}. This SN was discovered in the infrared using the Wide-FieldCamera 3, and it is the highest-redshift Type Ia SN yet observed. We classifythis object as a SN\,Ia by comparing its light curve and spectrum with those ofa large sample of Type Ia and core-collapse supernovae (SNe). Its apparentmagnitude is consistent with that expected from the $\Lambda$CDM concordancecosmology. We discuss the use of spectral evidence for classification of $z >1.5$ SNe\,Ia using {\it HST} grism simulations, finding that spectral dataalone can frequently rule out SNe\,II, but distinguishing between SNe\,Ia andSNe\,Ib/c can require prohibitively long exposures. In such cases, aquantitative analysis of the light curve may be necessary for classification.Our photometric and spectroscopic classification methods can aid thedetermination of SN rates and cosmological parameters from the fullhigh-redshift CANDELS SN sample.

The Discovery of the Most Distant Known Type Ia Supernova at Redshift 1.914