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SN 2012ec is a Type IIP supernova (SN) with a progenitor detection andcomprehensive photospheric-phase observational coverage. Here, we present VeryLarge Telescope and PESSTO observations of this SN in the nebular phase. Wemodel the nebular [O I] 6300, 6364 lines and find their strength to suggest aprogenitor main-sequence mass of 13-15 Msun. SN 2012ec is unique amonghydrogen-rich SNe in showing a distinct and unblended line of stable nickel [NiII] 7378. This line is produced by 58Ni, a nuclear burning ash whose abundanceis a sensitive tracer of explosive burning conditions. Using spectral synthesismodelling, we use the relative strengths of [Ni II] 7378 and [Fe II] 7155 (theprogenitor of which is 56Ni) to derive a Ni/Fe production ratio of 0.20pm0.07(by mass), which is a factor 3.4pm1.2 times the solar value. High production ofstable nickel is confirmed by a strong [Ni II] 1.939 micron line. This is thethird reported case of a core-collapse supernova producing a Ni/Fe ratio farabove the solar value, which has implications for core-collapse explosiontheory and galactic chemical evolution models.

Supersolar Ni/Fe production in the Type IIP SN 2012ec