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SN 2009ib: a Type II-P supernova with an unusually long plateau
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Number of Authors: 21
2015 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 450, no 3, 3137-3154 p.Article in journal (Refereed) Published
Abstract [en]

We present optical and near-infrared photometry and spectroscopy of SN 2009ib, a Type II-P supernova in NGC 1559. This object has moderate brightness, similar to those of the intermediate-luminosity SNe 2008in and 2009N. Its plateau phase is unusually long, lasting for about 130 d after explosion. The spectra are similar to those of the subluminous SN 2002gd, with moderate expansion velocities. We estimate the Ni-56 mass produced as 0.046 +/- A 0.015 M-aS (TM). We determine the distance to SN 2009ib using both the expanding photosphere method (EPM) and the standard candle method. We also apply EPM to SN 1986L, a Type II-P SN that exploded in the same galaxy. Combining the results of different methods, we conclude the distance to NGC 1559 as D = 19.8 +/- A 3.0 Mpc. We examine archival, pre-explosion images of the field taken with the Hubble Space Telescope, and find a faint source at the position of the SN, which has a yellow colour [(V - I)(0) = 0.85 mag]. Assuming it is a single star, we estimate its initial mass as M-ZAMS = 20 M-aS (TM). We also examine the possibility, that instead of the yellow source the progenitor of SN 2009ib is a red supergiant star too faint to be detected. In this case, we estimate the upper limit for the initial zero-age main sequence (ZAMS) mass of the progenitor to be similar to 14-17 M-aS (TM). In addition, we infer the physical properties of the progenitor at the explosion via hydrodynamical modelling of the observables, and estimate the total energy as similar to 0.55 x 10(51) erg, the pre-explosion radius as similar to 400 R-aS (TM), and the ejected envelope mass as similar to 15 M-aS (TM), which implies that the mass of the progenitor before explosion was similar to 16.5-17 M-aS (TM).

Place, publisher, year, edition, pages
2015. Vol. 450, no 3, 3137-3154 p.
Keyword [en]
supernovae: general, supernovae: individual: SN 2009ib, galaxies: individual: NGC 1559
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-119140DOI: 10.1093/mnras/stv857ISI: 000356339300066OAI: diva2:843756
Available from: 2015-07-31 Created: 2015-07-29 Last updated: 2015-07-31Bibliographically approved

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Ergon, Mattias
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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