Spectrophotometric time series of SN 2011fe from the Nearby Supernova Factory

TL;DR

This paper provides an extensive, high-quality spectrophotometric time series of the nearby SN 2011fe, offering valuable data for understanding Type Ia supernova physics and improving their use in cosmology.

Contribution

It presents a comprehensive, high signal-to-noise dataset of SN 2011fe, enabling detailed analysis and comparison to enhance supernova models and standardization methods.

Findings

SN 2011fe is a normal, unreddened Type Ia supernova.

The dataset allows for accurate bolometric light curve and nickel mass estimation.

Applications include supernova physics studies and cosmological distance measurements.

Abstract

We present 32 epochs of optical (3300-9700 \AA) spectrophotometric observations of the nearby quintessential "normal" type Ia supernova (SN Ia) SN 2011fe in the galaxy M101, extending from -15 to +97 d with respect to B-band maximum, obtained by the Nearby Supernova Factory collaboration. SN 2011fe is the closest (\mu = 29.04) and brightest (Bmax = 9.94 mag) SN Ia observed since the advent of modern large scale programs for the intensive periodic followup of supernovae. Both synthetic light curve measurements and spectral feature analysis attest to the normality of SN 2011fe. There is very little evidence for reddening in its host galaxy. The homogeneous calibration, intensive time sampling, and high signal-to-noise ratio of the data set make it unique. Thus it is ideal for studying the physics of SN Ia explosions in detail, and for furthering the use of SNe Ia as standardizable candles for cosmology. Several such applications are shown, from the creation of a bolometric light curve and measurement of the 56Ni mass, to the simulation of detection thresholds for unburned carbon, direct comparisons with other SNe Ia, and existing spectral templates.