Improved Standardization of Type II-P Supernovae: Application to an Expanded Sample

Details Improved Standardization of Type II-P Supernovae: Application to an Expanded Sample Improved Standardization of Type II-P Supernovae: Application to an Expanded Sample

2008-10-27

arxiv.org/abs/0810.4923v2

Astrophys.J.694:1067-1079,2009

Astronomy and Astrophysics

Astrophysics

ApJ accepted version. Minor changes

Scientific paper

10.1088/0004-637X/694/2/1067

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.

Affiliated with

Also associated with

No associations

Rating

Improved Standardization of Type II-P Supernovae: Application to an Expanded Sample does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Improved Standardization of Type II-P Supernovae: Application to an Expanded Sample, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Improved Standardization of Type II-P Supernovae: Application to an Expanded Sample will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-484728