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  • 1612.05636v1

    Rights statement: © 2017. The American Astronomical Society. All rights reserved.

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A Type II Supernova Hubble Diagram from the CSP-I, SDSS-II and SNLS Surveys

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  • Thomas de Jaeger
  • S. Gonzales-Gaitan
  • M. Hamuy
  • L. Galbany
  • J. P. Anderson
  • M. M. Phillips
  • M. D. Stritzinger
  • R. G. Carlberg
  • M. Sullivan
  • C. P. Gutierrez
  • Isobel Hook
  • D. Andrew Howell
  • E. Y. Hsiao
  • H. Kuncarayakti
  • V. Ruhlmann-Kleider
  • G. Folatelli
  • C. Pritchet
  • S. Basa
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Article number166
<mark>Journal publication date</mark>27/01/2017
<mark>Journal</mark>The Astrophysical Journal
Issue number2
Volume835
Number of pages17
Publication StatusPublished
<mark>Original language</mark>English

Abstract

The coming era of large photometric wide-field surveys will increase the detection rate of supernovae by orders of magnitude. Such numbers will restrict spectroscopic follow-up in the vast majority of cases, and hence new methods based solely on photometric data must be developed. Here, we construct a complete Hubble diagram of Type II supernovae (SNe II) combining data from three different samples: the Carnegie Supernova Project-I, the Sloan Digital Sky Survey II SN, and the Supernova Legacy Survey. Applying the Photometric Color Method (PCM) to 73 SNe II with a redshift range of 0.01–0.5 and with no spectral information, we derive an intrinsic dispersion of 0.35 mag. A comparison with the Standard Candle Method (SCM) using 61 SNe II is also performed and an intrinsic dispersion in the Hubble diagram of 0.27 mag, i.e., 13% in distance uncertainties, is derived. Due to the lack of good statistics at higher redshifts for both methods, only weak constraints on the cosmological parameters are obtained. However, assuming a flat universe and using the PCM, we derive the universe's matter density: ${{\rm{\Omega }}}_{m}={0.32}_{-0.21}^{+0.30}$ providing a new independent evidence for dark energy at the level of two sigma.

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© 2017. The American Astronomical Society. All rights reserved.