Initial Hubble Diagram Results from the Nearby Supernova Factory

TL;DR

This paper presents initial results from the Nearby Supernova Factory, which aims to improve cosmological measurements by collecting detailed spectrophotometric data on nearby Type Ia supernovae to complement high-redshift samples.

Contribution

It provides a large, high-quality dataset of spectrophotometric time series for 185 supernovae, enhancing the nearby supernova sample for cosmological studies.

Findings

Constructed a Hubble diagram from nearby supernovae data.

Demonstrated the potential for improved cosmological constraints.

Showcase of the dataset's richness and analysis capabilities.

Abstract

The use of Type Ia supernovae as distance indicators led to the discovery of the accelerating expansion of the universe a decade ago. Now that large second generation surveys have significantly increased the size and quality of the high-redshift sample, the cosmological constraints are limited by the currently available sample of ~50 cosmologically useful nearby supernovae. The Nearby Supernova Factory addresses this problem by discovering nearby supernovae and observing their spectrophotometric time development. Our data sample includes over 2400 spectra from spectral timeseries of 185 supernovae. This talk presents results from a portion of this sample including a Hubble diagram (relative distance vs. redshift) and a description of some analyses using this rich dataset.