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We present densely-sampled UBVRI/griz photometric and low-resolution (6-10A)optical spectroscopic observations from 4 to 270 days after explosion of anewly discovered type II SN 2012aw in a nearby (~9.9 Mpc) galaxy M95. Thelight-curve characteristics of apparent magnitudes, colors, bolometricluminosity and the presence and evolution of prominent spectral features arefound to have striking similarity with the archetypal IIP SNe 1999em, 1999giand 2004et. The early time observations of SN 2012aw clearly detect minima inthe light-curve of V, R and I bands near 37 days after explosion and this wesuggest to be an observational evidence for emergence of recombination phase.The mid-plateau MV magnitude (-16.67 $\pm$ 0.04) lies in between the bright (~-18) and subluminous (~ -15) IIP SNe. The mass of nickel is 0.06$\pm$0.01M_sun. The SYNOW modelling of spectra indicate that the value and evolution ofphotospheric velocity is similar to SN 2004et, but about ~600 km/s higher thanthat of SNe 1999em and 1999gi at comparable epochs. This trend is more apparentin the line velocities of H alpha and H beta. A comparison of ejecta velocityproperties with that of existing radiation-hydrodynamical simulations indicatethat the energy of explosion lies in the range 1-2x10^51 ergs; a furthercomparison of nebular phase [Oi] doublet luminosity with SNe 2004et and 1987Aindicate that the mass of progenitor star is about 14-15 M_sun. The presence ofhigh-velocity absorption features in the mid-to-late plateau and possibly inearly phase spectra show signs of interaction between ejecta and thecircumstellar matter; being consistent with its early-time detection at X-rayand radio wavebands.

Supernova 2012aw - a high-energy clone of archetypal type IIP SN 1999em