The Broad Line Type Ic Supernova Sn 2007ru: Adding to the Diversity of Type Ic Supernovae

Photometric and spectral evolution of the type Ic supernova SN 2007ru during the first 3 months are presented. The spectra show broad spectral features due to very high expansion velocity, normally seen in hypernovae. The photospheric velocity is higher than other type Ic supernovae. It is lower than SN 1998bw at ∼ 8 days after the explosion, but is comparable at later epochs. The light curve evolution of SN 2007ru indicates a fast rise time of 8±3 days to B band maximum and post-maximum decline more rapidly than other broad-line type Ic supernovae. With an absolute V magnitude of −19.10, SN 2007ru is comparable in brightness with SN 1998bw and lies at the brighter end of the observed type Ic supernovae. The mass of Ni is estimated to be ∼ 0.4M⊙. The fast rise and decline of the light curve and the high expansion velocity suggest that SN 2007ru is an explosion with a high kinetic energy/ejecta mass ratio (EK/Mej). This adds to the diversity of type Ic supernovae. Subject headings: supernovae: general supernovae: individual (SN 2007ru)