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We present optical and UV analysis of the luminous type Ia supernova SN2012dn covering the period $\sim -$11 to +109 days with respect to the $B$ bandmaximum, that occurred on JD 2456132.89 $\pm$ 0.19, with an apparent magnitudeof $m_{B}^\text{max}$ = 14.38 $\pm$ 0.02. The absolute magnitudes at maximum in$B$ and $V$ bands are $M_{B}^\text{max} = -19.52 \pm 0.15$ and$M_{V}^\text{max} = -19.42 \pm 0.15$, respectively. SN 2012dn is marginallyluminous compared to normal type Ia supernovae. The peak bolometric luminosityof $\log L_\text{bol}^\text{max} = 43.27 \pm 0.06$ erg s$^{-1}$ suggests that$0.82 \pm 0.12$ M$_\odot$ of $^{56}$Ni was synthesized in the explosion. Thedecline rate $\Delta m_{15}(B)_\text{true}= 0.92 \pm 0.04$ mag is lower thanthat of normal type Ia supernovae, and similar to the luminous SN 1991T.However, the photometric and spectroscopic behaviour of SN 2012dn is differentfrom that of SN 1991T. Early phase light curves in $R$ and $I$ bands are verybroad. The $I$ band peak has a plateau-like appearance similar to thesuper-Chandra SN 2009dc. Pre-maximum spectra show clear evidence of C\,{\sc ii}6580 \AA\, line, indicating the presence of unburned materials. The velocityevolution of C\,{\ sc ii} line is peculiar. Except for the very early phase($\sim-$13 d), the C\,{\sc ii} line velocity is lower than the velocityestimated using the Si\,{\sc ii} line. During the pre-maximum and close tomaximum phase, to reproduce observed shape of the spectra, the syntheticspectrum code {\sc syn++} needs significantly higher blackbody temperature thanthose required for normal type Ia events. The photospheric velocity evolutionand other spectral properties are similar to those of the carbon-rich SN2006gz.

Supernova SN 2012dn: A spectroscopic clone of SN 2006gz