%0 Journal Article
%T A Type Ia Supernova at Redshift 1.55 in Hubble Space Telescope Infrared Observations from CANDELS
%A Steven A. Rodney
%A Adam G. Riess
%A Tomas Dahlen
%A Louis-Gregory Strolger
%A Henry C. Ferguson
%A Jens Hjorth
%A Teddy F. Frederiksen
%A Benjamin J. Weiner
%A Bahram Mobasher
%A Stefano Casertano
%A David O. Jones
%A Peter Challis
%A S. M. Faber
%A Alexei V. Filippenko
%A Peter Garnavich
%A Or Graur
%A Norman A. Grogin
%A Brian Hayden
%A Saurabh W. Jha
%A Robert P. Kirshner
%A Dale Kocevski
%A Anton Koekemoer
%A Curtis McCully
%A Brandon Patel
%A Abhijith Rajan
%A Claudia Scarlata
%J Physics
%D 2012
%I arXiv
%R 10.1088/0004-637X/746/1/5
%X We report the discovery of a Type Ia supernova (SNIa) at redshift z=1.55 with the infrared detector of the Wide Field Camera 3 (WFC3-IR) on the Hubble Space Telescope (HST). This object was discovered in CANDELS imaging data of the Hubble Ultra Deep Field, and followed as part of the CANDELS+CLASH Supernova project, comprising the SN search components from those two HST multi-cycle treasury programs. This is the highest redshift SNIa with direct spectroscopic evidence for classification. It is also the first SN Ia at z>1 found and followed in the infrared, providing a full light curve in rest-frame optical bands. The classification and redshift are securely defined from a combination of multi-band and multi-epoch photometry of the SN, ground-based spectroscopy of the host galaxy, and WFC3-IR grism spectroscopy of both the SN and host. This object is the first of a projected sample at z>1.5 that will be discovered by the CANDELS and CLASH programs. The full CANDELS+CLASH SN Ia sample will enable unique tests for evolutionary effects that could arise due to differences in SN Ia progenitor systems as a function of redshift. This high-z sample will also allow measurement of the SN Ia rate out to z~2, providing a complementary constraint on SN Ia progenitor models.
%U http://arxiv.org/abs/1201.2470v1