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Toward a cosmological Hubble diagram for Type II-P supernovae

Nugent, Peter and Sullivan, Mark and Ellis, Richard and Gal-Yam, Avishay and Leonard, Douglas C. and Howell, D. Andrew and Astier, Pierre and Carlberg, Raymond G. and Conley, Alex and Fabbro, Sebastien and Fouchez, Dominique and Neill, James D. and Pain, Reynald and Perrett, Kathy and Pritchet, Chris J. and Regnault, Nicolas (2006) Toward a cosmological Hubble diagram for Type II-P supernovae. Astrophysical Journal, 645 (2). pp. 841-850. ISSN 0004-637X.

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We present the first high-redshift Hubble diagram for Type II-P supernovae (SNe II-P) based on five events at redshift up to z ~ 0.3. This diagram was constructed using photometry from the Canada-France-Hawaii Telescope Supernova Legacy Survey and absorption-line spectroscopy from the Keck Observatory. The method used to measure distances to these supernovae is based on recent work by Hamuy & Pinto and exploits a correlation between the absolute brightness of SNe II-P and the expansion velocities derived from the minimum of the Fe II λ 5169 P Cygni feature observed during the plateau phases. We present three refinements to this method that significantly improve the practicality of measuring the distances of SNe II-P at cosmologically interesting redshifts. These are an extinction correction measurement based on the V-I colors at day 50, a cross-correlation measurement for the expansion velocity, and the ability to extrapolate such velocities accurately over almost the entire plateau phase. We apply this revised method to our data set of high-redshift SNe II-P and find that the resulting Hubble diagram has a scatter of only 0.26 mag, thus demonstrating the feasibility of measuring the expansion history, with present facilities, using a method independent of that based on supernovae of Type Ia.

Item Type:Article
Nugent, Peter0000-0002-3389-0586
Gal-Yam, Avishay0000-0002-3653-5598
Neill, James D.0000-0002-0466-1119
Additional Information:© 2006 The American Astronomical Society. Received 2005 April 12; accepted 2006 March 20. Based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada-France-Hawaii Telescope (CFHT), which is operated by the National Research Council (NRC) of Canada, the Institut National des Science de l'Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at the Canadian Astronomy Data Centre as part of the CFHT Legacy Survey, a collaborative project of the NRC and CNRS. Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. P. E. N. acknowledges support from NASA ATP and LTSA grants. R. S. E. acknowledges financial support from the Department of Energy (DOE). A. G. acknowledges support by NASA through Hubble Fellowship grant HST-HF-01158.01-A, awarded by STScI, which is operated by AURA, Inc., for NASA, under contract NAS5-26555. D. C. L. is supported by a National Science Foundation (NSF) Astronomy and Astrophysics Postdoctoral Fellowship under award AST 04-01479. This research used resources of the National Energy Research Scientific Computing Center, which is supported by the Office of Science of the US DOE, under contract DE-AC03-76SF00098. We thank them for a generous allocation of computing time.
Group:Space Astrophysics Laboratory
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
NASA Hubble FellowshipHST-HF-01158.01-A
Department of Energy (DOE)DE-AC03-76SF00098
NASANAS 5-26555
NSF Astronomy and Astrophysics FellowshipAST 04-01479
Subject Keywords:distance scale; supernovae
Record Number:CaltechAUTHORS:NUGapj06
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6750
Deposited By: Lindsay Cleary
Deposited On:20 Dec 2006
Last Modified:26 Oct 2017 22:01

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