SN 2009N: linking normal and subluminous Type II-P Sne
نویسندگان
چکیده
We present ultraviolet, optical, near-infrared photometry and spectroscopy of SN 2009N in NGC 4487. This object is a Type II-P supernova with spectra resembling those of subluminous II-P supernovae, while its bolometric luminosity is similar to that of the intermediateluminosity SN 2008in. We created SYNOW models of the plateau phase spectra for line identification and to measure the expansion velocity. In the near-infrared spectra we find signs indicating possible weak interaction between the supernova ejecta and the pre-existing circumstellar material. These signs are also present in the previously unpublished near-infrared spectra of SN 2008in. The distance to SN 2009N is determined via the expanding photosphere method and the standard candle method as D = 21.6 ± 1.1 Mpc. The produced nickel-mass is estimated to be ∼0.020 ± 0.004 M . We infer the physical properties of the progenitor at the explosion through hydrodynamical modelling of the observables. We find the values of E-mail: [email protected] C © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society at Q uen's U niersity B efast on A ril 9, 2014 hp://m nras.oxjournals.org/ D ow nladed from SN 2009N in NGC 4487 369 the total energy as ∼0.48 × 1051 erg, the ejected mass as ∼11.5 M , and the initial radius as ∼287 R .
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تاریخ انتشار 2013