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

February 2014 • 2014MNRAS.438..368T

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

Abstract • 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 These signs are also present in the previously unpublished near-infrared spectra of SN 2008in.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_⊙.

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Schuyler Van Dyk

Senior Scientist