The discovery of the most distant known type Ia supernova at redshift 1.914

David O. Jones, Steven A. Rodney, Adam G. Riess, Bahram Mobasher, Tomas Dahlen, Curtis McCully, Teddy F. Frederiksen, Stefano Casertano, Jens Hjorth, Charles R. Keeton, Anton Koekemoer, Louis Gregory Strolger, Tommy G. Wiklind, Peter Challis, Or Graur, Brian Hayden, Brandon Patel, Benjamin J. Weiner, Alexei V. Filippenko, Peter GarnavichSaurabh W. Jha, Robert P. Kirshner, Henry C. Ferguson, Norman A. Grogin, Dale Kocevski

Research output: Contribution to journalArticlepeer-review

60 Scopus citations


We present the discovery of a Type Ia supernova (SN) at redshift z = 1.914 from the CANDELS multi-cycle treasury program on the Hubble Space Telescope (HST). This SN was discovered in the infrared using the Wide-Field Camera 3, and it is the highest-redshift Type Ia SN yet observed. We classify this object as a SN Ia by comparing its light curve and spectrum with those of a large sample of Type Ia and core-collapse SNe. Its apparent magnitude is consistent with that expected from the ΛCDM concordance cosmology. We discuss the use of spectral evidence for classification of z > 1.5 SNe Ia using HST grism simulations, finding that spectral data alone can frequently rule out SNe II, but distinguishing between SNe Ia and SNe Ib/c can require prohibitively long exposures. In such cases, a quantitative analysis of the light curve may be necessary for classification. Our photometric and spectroscopic classification methods can aid the determination of SN rates and cosmological parameters from the full high-redshift CANDELS SN sample.

Original languageEnglish (US)
Article number166
JournalAstrophysical Journal
Issue number2
StatePublished - May 10 2013


  • supernovae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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