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arXiv · 0912.3302

On the nature of the progenitors of three type II-P supernovae: 2004et, 2006my and 2006ov

R. M. Crockett·S. J. Smartt·A. Pastorello·J. J. Eldridge·A. W. Stephens·J. R. Maund·S. Mattila
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Abstract

The pre-explosion observations of the type II-P supernovae 2006my, 2006ov and 2004et, are re-analysed. In the cases of supernovae 2006my and 2006ov we argue that the published candidate progenitors are not coincident with their respective supernova sites in pre-explosion Hubble Space Telescope observations. We therefore derive upper luminosity and mass limits for the unseen progenitors of both these supernovae, assuming they are red supergiants: 2006my (log L/Lsun = 4.51; mass < 13Msun) and 2006ov (log L/Lsun = 4.29; mass < 10Msun). In the case of supernova 2004et we show that the yellow-supergiant progenitor candidate, originally identified in Canada France Hawaii Telescope images, is still visible ~3 years post-explosion in observations from the William Herschel Telescope. High-resolution Hubble Space Telescope and Gemini (North) adaptive optics late-time imagery reveal that this source is not a single yellow supergiant star, but rather is resolved into at least three distinct sources. We report the discovery of the unresolved progenitor as an excess of flux in pre-explosion Isaac Newton Telescope i'-band imaging. Accounting for the late-time contribution of the supernova using published optical spectra, we calculate the progenitor photometry as the difference between the pre- and post-explosion, ground-based observations. We find the progenitor was most likely a late K to late M-type supergiant of 8 +5/-1 Msun. In all cases we conclude that future, high-resolution observations of the supernova sites will be required to confirm these results.

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R. M. Crockett, S. J. Smartt, A. Pastorello, J. J. Eldridge, A. W. Stephens, J. R. Maund, S. Mattila. 2010-09-07. On the nature of the progenitors of three type II-P supernovae: 2004et, 2006my and 2006ov. https://doi.org/10.1111/j.1365-2966.2010.17652.x

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