Early-phase photometry and spectroscopy of transitional Type Ia SN 2012ht: Direct constraint on the rise time

Masayuki Yamanaka, Keiichi Maeda, Miho Kawabata +15

We report photometric and spectroscopic observations of the nearby Type Ia Supernova (SN Ia) 2012ht from $-15.8$ days to $+49.1$ days after $B$-band maximum. The decline rate of th…