A low-luminosity core-collapse supernova very similar to SN 2005cs

We present observations and analysis of PSN J17292918+7542390, a low-luminosity Type II-P supernova (LL SN IIP). The observed sample of such events is still low, and their nature is still under debate. Such SNe are similar to SN 2005cs, a well-observed LL Type II-P event, having low expansion velocities, and small ejected Ni-56 mass. We have developed a robust and relatively fast Monte Carlo code that fits semi-analytic models to light curves of core-collapse SNe. This allows the estimation of the most important physical parameters, like the radius of the progenitor star, themass of the ejected envelope, themass of the radioactive nickel synthesized during the explosion, among others. PSN J17292918+7542390 has R-0 = 91(-70)(+119) x 10(11) cm, M-ej = 9.89(-1.00)(+2.10)M(circle dot), E-kin = 0.65(-0.18)(+0.19) foe, and v(exp) = 3332(-347)(+216) km s(-1), for its progenitor radius, ejecta mass, kinetic energy, and expansion velocity, respectively. The initial nickel mass of the PSN J17292918+7542390 turned out to be 1.55(-0.70)(+0.75) x 10(-3)M(circle dot). The measured photospheric velocity at the earliest observed phase is 7000 km s(-1). As far as we can tell based on the small population of observed LL SNe IIP, the determined values are typical for these events.