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SN 2009ib: a Type II-P supernova with an unusually long plateau

Takáts, K., Pignata, G., Pumo, M. L., Paillas, E., Zampieri, L., Elias-Rosa, N., Benetti, S., Bufano, F., Cappellaro, E., Ergon, M., Fraser, M., Hamuy, M., Inserra, C. ORCID:, Kankare, E., Smartt, S. J., Stritzinger, M. D., Van Dyk, S. D., Haislip, J. B., LaCluyze, A. P., Moore, J. P. and Reichart, D. 2015. SN 2009ib: a Type II-P supernova with an unusually long plateau. Monthly Notices of the Royal Astronomical Society 450 (3) , pp. 3137-3154. 10.1093/mnras/stv857

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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 56Ni mass produced as 0.046 ± 0.015 M⊙. 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 ± 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 MZAMS = 20 M⊙. 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 ∼14–17 M⊙. 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 ∼0.55 × 1051 erg, the pre-explosion radius as ∼400 R⊙, and the ejected envelope mass as ∼15 M⊙, which implies that the mass of the progenitor before explosion was ∼16.5–17 M⊙.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 24 January 2019
Date of Acceptance: 15 April 2015
Last Modified: 05 May 2023 14:14

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