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We present a study of the properties of the host galaxies of unusualtransient objects of two types, both being sub-luminous compared with the majorclasses of supernovae. Those of one type exhibit unusually strong calciumfeatures, and have been termed 'Ca-rich'. Those of the second type, withSN2002cx as the prototype and SN2008ha as the most extreme example to date,have some properties in common with the first, but show typically lower ejectavelocities, and different early spectra. We confirm important differences inthe environments of the two types, with the Ca-rich transients preferentiallyoccurring in galaxies dominated by old stellar populations. Quantitatively, theassociation of the the Ca-rich transients with regions of ongoing starformation is well matched to that of type Ia supernovae. The SN2002cx-liketransients are very different, with none of the present sample occurring in anearly-type host, and a statistical association with star-formation regionssimilar to that of type II-P supernovae, and therefore a delay time of 30-50Myrs.

Environment-derived constraints on the progenitors of low-luminosity type I supernovae