A Type Ia Supernova at Redshift 1.55 in Hubble Space Telescope Infrared Observations from CANDELS
Abstract
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.
Keywords
Cite
@article{arxiv.1201.2470,
title = {A Type Ia Supernova at Redshift 1.55 in Hubble Space Telescope Infrared Observations from CANDELS},
author = {Steven A. Rodney and Adam G. Riess and Tomas Dahlen and Louis-Gregory Strolger and Henry C. Ferguson and Jens Hjorth and Teddy F. Frederiksen and Benjamin J. Weiner and Bahram Mobasher and Stefano Casertano and David O. Jones and Peter Challis and S. M. Faber and Alexei V. Filippenko and Peter Garnavich and Or Graur and Norman A. Grogin and Brian Hayden and Saurabh W. Jha and Robert P. Kirshner and Dale Kocevski and Anton Koekemoer and Curtis McCully and Brandon Patel and Abhijith Rajan and Claudia Scarlata},
journal= {arXiv preprint arXiv:1201.2470},
year = {2015}
}
Comments
10 pages, 6 figures, accepted for publication in ApJ