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We present optical photometric and spectroscopic observations of the1987A-like supernova (SN) 2009mw. Our $BVRI$ and $g'r'i'z'$ photometry covers167 days of evolution, including the rise to the light curve maximum, and endsjust after the beginning of the linear tail phase. We compare the observationalproperties of SN 2009mw with those of other SNe belonging to the same subgroup,and find that it shows similarities to several objects. The physical parametersof the progenitor and the SN are estimated via hydrodynamical modelling,yielding an explosion energy of $1$ foe, a pre-SN mass of $19\,{\rmM_{\odot}}$, a progenitor radius as $30\,{\rm R_{\odot}}$ and a $^{56}$Ni massas $0.062\,{\rm M_{\odot}}$. These values indicate that the progenitor of SN2009mw was a blue supergiant star, similar to the progenitor of SN 1987A. Weexamine the host environment of SN 2009mw and find that it emerged from apopulation with slightly sub-solar metallicty.

Optical photometry and spectroscopy of the 1987A-like supernova 2009mw