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

PIGNATA, G.; TAKATS; BERSTEN MELINA

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2016

0035-8711

We present optical photometric and spectroscopic observations of the 1987A-like supernova (SN) 2009mw. Our BV RI and g′ r′ i′z′ photometry covers 167 days of evolution, including the rise to the light curve maximum, and ends just after the beginning of the linear tail phase. We compare the observational properties of SN 2009mw withthose of other SNe belonging to the same subgroup, and find that it shows similarities to several objects. The physical parameters of the progenitor and the SN are estimated via hydrodynamical modelling, yielding an explosion energy of 1 foe, a pre-SN mass of 19 Msun , a progenitor radius as 30 Rsun and a 56 Ni mass as 0.062 Msun. These values indicate that the progenitor of SN 2009mw was a blue supergiant star, similar to the progenitor of SN 1987A. We examine the host environment of SN 2009mw and find that it emerged from a population with slightly sub-solar metallicty.