An Empirical Fitting Method for Type Ia Supernova Light Curves. II.   Estimating the First-Light Time and Rise Time
  We investigate a new empirical fitting method for the optical light curves of Type Ia supernovae (SNe~Ia) that is able to estimate the first-light time of SNe~Ia, even when they are not discovered extremely early. With an improved ability to estimate the time of first light for SNe Ia, we compute the rise times for a sample of 56 well-observed SNe~Ia. We find rise times ranging from 10.5 to 20.5 days, with a mean of 16.0 days, and confirm that the rise time is generally correlated with the decline rate $\Delta m_{15}(B)$, but with large scatter. The rise time could be an additional parameter to help classify SN~Ia subtypes. 
WeiKang Zheng (1), Patrick L. Kelly (1) and Alexei V. Filippenko (1)   ((1) UCB)
astro-ph.HE