SN 2009N: linking normal and subluminous Type II-P Sne

K. Takats, M. L. Pumo, N. Elias-Rosa, A. Pastorello, G. Pignata, E. Paillas, L. Zampieri, J. P. Anderson, J. Vinko, S. Benetti, M. T. Botticella, F. Bufano, A. Campillay, R. Cartier, M. Ergon, G. Folatelli, R. J. Foley, F. Forster, M. Hamuy, V.-P. HentunenE. Kankare, G. Leloudas, N. Morrell, M. Nissinen, M. M. Phillips, S. J. Smartt, M. Stritzinger, S. Taubenberger, S. Valenti, S. D. Van Dyk, J. B. Haislip, A. P. LaCluyze, J. P. Moore, D. Reichart

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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 intermediate-luminosity 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 These signs are also present in the previously unpublished near-infrared spectra of SN 2008in.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 the total energy as ∼0.48 × 1051 erg, the ejected mass as ∼11.5 M⊙, and the initial radius as ∼287 R⊙.
Original languageEnglish
Pages (from-to)368-387
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Early online date13 Dec 2013
Publication statusPublished - 11 Feb 2014


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