A Type II Supernova Hubble diagram from the CSP-I, SDSS-II, and SNLS surveys
2017
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:
{{{Ω }}}m={0.32}-0.21+0.30
providing a new independent evidence for dark energy at the level of two
sigma.This paper includes data gathered with the 6.5 m Magellan Telescopes,
with the du Pont and Swope telescopes located at Las Campanas
Observatory, Chile; and the Gemini Observatory, Cerro Pachon, Chile
(Gemini Program N-2005A-Q-11, GN-2005B-Q-7, GN-2006A-Q-7, GS-2005A-Q-11,
GS-2005B-Q-6, and GS-2008B-Q-56). Based on observations collected at the
European Organization for Astronomical Research in the Southern
Hemisphere, Chile (ESO Programmes 076.A-0156,078.D-0048, 080.A-0516, and
082.A-0526).
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