Type II-P Supernovae from the SDSS-II Supernova Survey and the Standardized Candle Method
Abstract
We apply the Standardized Candle Method (SCM) for Type II Plateau supernovae (SNe II-P), which relates the velocity of the ejecta of a SN to its luminosity during the plateau, to 15 SNe II-P discovered over the three season run of the Sloan Digital Sky Survey - II Supernova Survey. The redshifts of these SNe - 0.027 < z < 0.144 - cover a range hitherto sparsely sampled in the literature; in particular, our SNe II-P sample contains nearly as many SNe in the Hubble flow (z > 0.01) as all of the current literature on the SCM combined. We find that the SDSS SNe have a very small intrinsic I-band dispersion (0.22 mag), which can be attributed to selection effects. When the SCM is applied to the combined SDSS-plus-literature set of SNe II-P, the dispersion increases to 0.29 mag, larger than the scatter for either set of SNe separately. We show that the standardization cannot be further improved by eliminating SNe with positive plateau decline rates, as proposed in Poznanski et al. (2009). We thoroughly examine all potential systematic effects and conclude that for the SCM to be useful for cosmology, the methods currently used to determine the Fe II velocity at day 50 must be improved, and spectral templates able to encompass the intrinsic variations of Type II-P SNe will be needed.
Keywords
Cite
@article{arxiv.0910.5597,
title = {Type II-P Supernovae from the SDSS-II Supernova Survey and the Standardized Candle Method},
author = {Chris B. D'Andrea and Masao Sako and Benjamin Dilday and Joshua A. Frieman and Jon Holtzman and Richard Kessler and Kohki Konishi and Donald P. Schneider and Jesper Sollerman and J. C. Wheeler and Naoki Yasuda and David Cinabro and Saurabh Jha and Robert C. Nichol and Hubert Lampeitl and Mathew Smith and David W. Atlee and Bruce Basset and Francisco J. Castander and Ariel Goobar and Ramon Miquel and Jakob Nordin and Linda Östman and Jose Luis Prieto and Robert Quimby and Adam G. Riess and Maximilian Stritzinger},
journal= {arXiv preprint arXiv:0910.5597},
year = {2014}
}
Comments
Accepted for publication by ApJ; data used in this paper can be downloaded from http://sdssdp47.fnal.gov/sdsssn/photometry/SNIIp.tgz; citation errors corrected