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We report comprehensive multi-wavelength observations of a peculiar TypeIa-like supernova ("SN Ia-pec") ASASSN-15pz. ASASSN-15pz is a spectroscopic"twin" of SN 2009dc, a so-called "Super-Chandrasekhar-mass" SN, throughout itsevolution, but it has a peak luminosity M_B,peak = -19.69 +/- 0.12 mag that is\approx 0.6 mag dimmer and comparable to the SN 1991T sub-class of SNe Ia atthe luminous end of the normal width-luminosity relation. The synthesized Ni56mass of M_Ni56 = 1.13 +/- 0.14 M_sun is also substantially less than that foundfor several 2009dc-like SNe. Previous well-studied 2009dc-like SNe havegenerally suffered from large and uncertain amounts of host-galaxy extinction,which is negligible for ASASSN-15pz. Based on the color of ASASSN-15pz, weestimate a host extinction for SN 2009dc of E(B-V)_host=0.12 mag and confirmits high luminosity (M_B, peak[2009dc] \approx -20.3 mag). The 2009dc-like SNpopulation, which represents ~1% of SNe Ia, exhibits a range of peakluminosities, and do not fit onto the tight width-luminosity relation. Theiroptical light curves also show significant diversity of late-time (>~ 50 days)decline rates. The nebular-phase spectra provide powerful diagnostics toidentify the 2009dc-like events as a distinct class of SNe Ia. We suggestreferring to these sources using the phenomenology-based "2009dc-like SNIa-pec" instead of "Super-Chandrasekhar SN Ia," which is based on an uncertaintheoretical interpretation.

ASASSN-15pz: Revealing Significant Photometric Diversity among 2009dc-like, Peculiar SNe Ia