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

TAKÁTS; PUMO; ELIAS-ROSA; PASTORELLO; PIGNATA, GIULIANO; PAILLAS; ZAMPIERI; ANDERSON; VINKÓ; BENETTI; BOTTICELLA; BUFANO; CAMPILLAY; CARTIER; ERGON; FOLATELLI, GASTÓN; FOLEY; FORSTER; HAMUY; HENTUNEN; KANKARE; LELOUDAS; MORRELL, N. I.; NISSINEN; PHILLIPS; SMARTT; STRITZINGER, MAXIMILIAN D.; TAUBENBERGER, STEFAN; VALENTI; VAN DYK; HAISLIP; LACLUYZE; MOORE; REICHART, D. E.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2014 vol. 438

0035-8711

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 These signs are also present in the previously unpublished near-infrared spectra of SN 2008in.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