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 These signs are also present in the previously unpublished near-infrared spectra of SN 2008in.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⊙.
- Galaxies: individual: NGC 4487
- Supernovae: general
- Supernovae: individual: SN 2008in
- Supernovae: individual: SN 2009N
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science