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Fukazawa, Y. Ikejiri, Y. Kamata","submitted_at":"2009-08-14T15:55:20Z","abstract_excerpt":"We present early phase observations in optical and near-infrared wavelengths for the extremely luminous Type Ia supernova (SN Ia) 2009dc. The decline rate of the light curve is $\\Delta m_{15}(B)=0.65\\pm 0.03$, which is one of the slowest among SNe Ia. The peak $V$-band absolute magnitude is $M_{V}=-19.90\\pm 0.15$ mag even if the host extinction is $A_{V}=0$ mag. It reaches $M_{V}=-20.19\\pm 0.19$ mag for the host extinction of $A_{V}=0.29$ mag as inferred from the observed Na {\\sc i} D line absorption in the host. 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