Improved Standardization of Type II-P Supernovae: Application to an Expanded Sample
Abstract
In the epoch of precise and accurate cosmology, cross-confirmation using a variety of cosmographic methods is paramount to circumvent systematic uncertainties. Owing to progenitor histories and explosion physics differing from those of Type Ia SNe (SNe Ia), Type II-plateau supernovae (SNe II-P) are unlikely to be affected by evolution in the same way. Based on a new analysis of 17 SNe II-P, and on an improved methodology, we find that SNe II-P are good standardizable candles, almost comparable to SNe Ia. We derive a tight Hubble diagram with a dispersion of 10% in distance, using the simple correlation between luminosity and photospheric velocity introduced by Hamuy & Pinto 2002. We show that the descendent method of Nugent et al. 2006 can be further simplified and that the correction for dust extinction has low statistical impact. We find that our SN sample favors, on average, a very steep dust law with total to selective extinction R_V<2. Such an extinction law has been recently inferred for many SNe Ia. Our results indicate that a distance measurement can be obtained with a single spectrum of a SN II-P during the plateau phase combined with sparse photometric measurements.
Keywords
Cite
@article{arxiv.0810.4923,
title = {Improved Standardization of Type II-P Supernovae: Application to an Expanded Sample},
author = {Dovi Poznanski and Nathaniel Butler and Alexei V. Filippenko and Mohan Ganeshalingam and Weidong Li and Joshua S. Bloom and Ryan Chornock and Ryan J. Foley and Peter E. Nugent and Jeffrey M. Silverman and S. Bradley Cenko and Elinor L. Gates and Douglas C. Leonard and Adam A. Miller and Maryam Modjaz and Frank J. D. Serduke and Nathan Smith and Brandon J. Swift and Diane S. Wong},
journal= {arXiv preprint arXiv:0810.4923},
year = {2011}
}
Comments
ApJ accepted version. Minor changes