The Discovery of the Most Distant Known Type Ia Supernova at Redshift 1.914
Abstract
We present the discovery of a Type Ia supernova (SN) at redshift from the CANDELS multi-cycle treasury program on the \textit{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 supernovae (SNe). Its apparent magnitude is consistent with that expected from the CDM concordance cosmology. We discuss the use of spectral evidence for classification of SNe\,Ia using {\it 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.
Keywords
Cite
@article{arxiv.1304.0768,
title = {The Discovery of the Most Distant Known Type Ia Supernova at Redshift 1.914},
author = {David O. Jones and Steven A. Rodney and Adam G. Riess and Bahram Mobasher and Tomas Dahlen and Curtis McCully and Teddy F. Frederiksen and Stefano Casertano and Jens Hjorth and Charles R. Keeton and Anton Koekemoer and Louis-Gregory Strolger and Tommy G. Wiklind and Peter Challis and Or Graur and Brian Hayden and Brandon Patel and Benjamin J. Weiner and Alexei V. Filippenko and Peter Garnavich and Saurabh W. Jha and Robert P. Kirshner and Henry C. Ferguson and Norman A. Grogin and Dale Kocevski},
journal= {arXiv preprint arXiv:1304.0768},
year = {2015}
}
Comments
10 pages, 5 figures; accepted for publication in ApJ; minor changes