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The Type IIP SN 2007od in UGC 12846: from a bright maximum to dust formation in the nebular phase

Inserra, C., Turatto, M., Pastorello, A., Benetti, S., Cappellaro, E., Pumo, M. L., Zampieri, L., Agnoletto, I., Bufano, F., Botticella, M. T., Della Valle, M., Elias Rosa, N., Iijima, T., Spiro, S. and Valenti, S. 2011. The Type IIP SN 2007od in UGC 12846: from a bright maximum to dust formation in the nebular phase. Monthly Notices of the Royal Astronomical Society 417 (1) , pp. 261-279. 10.1111/j.1365-2966.2011.19128.x

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Abstract

Ultraviolet, optical and near-infrared observations of the Type IIP supernova (SN) 2007od, covering from maximum light to late phases, allow detailed investigation of different physical phenomena in the expanding ejecta. These data turn this object into one of the most peculiar SNe IIP ever studied. The early light curve of SN 2007od is similar to that of a bright IIP, with a short plateau, a bright peak (MV=−18 mag), but a very faint late-time optical light curve. However, with the inclusion of mid-IR observations during the radioactive tail, we derive an ejected mass of 56Ni of M(56Ni) ∼2 × 10−2 M⊙. By modelling the bolometric light curve, ejecta expansion velocities and blackbody temperature, we estimate a total ejected mass of 5–7.5 M⊙ with a kinetic energy of at least 0.5 × 1051 erg. The early spectra reveal a boxy Hα profile and high-velocity features of the Balmer series that suggest the possible interaction of the ejecta with a close circumstellar matter (CSM). The interaction with the CSM and the presence of dust formed inside the ejecta are evident in the late-time spectra. The episodes of mass-loss shortly before explosion, the bright plateau, the relatively small amount of 56Ni and the faint [O i] emission observed in the nebular spectra are consistent with a super-asymptotic giant branch progenitor (M∼ 9.7–11 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: 2 January 2019
Date of Acceptance: 24 May 2011
Last Modified: 08 Jan 2019 14:49
URI: http://orca.cf.ac.uk/id/eprint/117985

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