Type Ia supernova bolometric light curves and ejected mass estimates
  from the Nearby Supernova Factory
  We present a sample of normal type Ia supernovae from the Nearby Supernova
Factory dataset with spectrophotometry at sufficiently late phases to estimate
the ejected mass using the bolometric light curve. We measure $^{56}$Ni masses
from the peak bolometric luminosity, then compare the luminosity in the
$^{56}$Co-decay tail to the expected rate of radioactive energy re- lease from
ejecta of a given mass. We infer the ejected mass in a Bayesian context using a
semi-analytic model of the ejecta, incorporating constraints from contemporary
numerical models as priors on the density structure and distribution of
$^{56}$Ni throughout the ejecta. We find a strong correlation between ejected
mass and light curve decline rate, and consequently $^{56}$Ni mass, with
ejected masses in our data ranging from 0.9-1.4 $M_\odot$. Most fast-declining
(SALT2 $x_1 < -1$) normal SNe Ia have significantly sub-Chandrasekhar ejected
masses in our fiducial analysis.
