A Type Ia supernova at redshift 1.55 in Hubble Space Telescope infrared observations from CANDELS

Steven A. Rodney, Dahlen Tomas Dahlen, Adam G. Riess, Tomas Dahlen, Louis Gregory Strolger, Henry C. Ferguson, Jens Hjorth, Teddy F. Frederiksen, Benjamin J. Weiner, Bahram Mobasher, Stefano Casertano, David O. Jones, Peter Challis, S. M. Faber, Alexei V. Filippenko, Peter Garnavich, Or Graur, Norman A. Grogin, Brian Hayden, Saurabh W. JhaRobert P. Kirshner, Dale Kocevski, Anton Koekemoer, Curtis McCully, Brandon Patel, Abhijith Rajan, Claudia Scarlata

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


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 SNIa 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 SNIa progenitor systems as a function of redshift. This high-z sample will also allow measurement of the SNIa rate out to z 2, providing a complementary constraint on SNIa progenitor models.

Original languageEnglish (US)
Article number5
JournalAstrophysical Journal
Issue number1
StatePublished - Feb 10 2012


  • supernovae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'A Type Ia supernova at redshift 1.55 in Hubble Space Telescope infrared observations from CANDELS'. Together they form a unique fingerprint.

Cite this