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We present optical and infrared monitoring data of SN 2012hn collected by thePublic ESO Spectroscopic Survey for Transient Objects (PESSTO). We show that SN2012hn has a faint peak magnitude (MR ~ -15.7) and shows no hydrogen and noclear evidence for helium in its spectral evolution. Instead, we detectprominent Ca II lines at all epochs, which relates this transient to previouslydescribed 'Ca-rich' or 'gap' transients. However, the photospheric spectra(from -3 to +32 d with respect to peak) of SN 2012hn show a series ofabsorption lines which are unique, and a red continuum that is likely intrinsicrather than due to extinction. Lines of Ti II and Cr II are visible. This maybe a temperature effect, which could also explain the red photospheric colour.A nebular spectrum at +150d shows prominent CaII, OI, CI and possibly MgI lineswhich appear similar in strength to those displayed by core-collapse SNe. Toadd to the puzzle, SN 2012hn is located at a projected distance of 6 kpc froman E/S0 host and is not close to any obvious starforming region. Overall SN2012hn resembles a group of faint H-poor SNe that have been discovered recentlyand for which a convincing and consistent physical explanation is stillmissing. They all appear to explode preferentially in remote locations offsetfrom a massive host galaxy with deep limits on any dwarf host galaxies,favouring old progenitor systems. SN 2012hn adds heterogeneity to this sampleof objects. We discuss potential explosion channels including He-shelldetonations and double detonations of white dwarfs as well as peculiarcore-collapse SNe.

PESSTO monitoring of SN 2012hn: further heterogeneity among faint type I supernovae