On the nature of the progenitors of three type II-P supernovae: 2004et, 2006my and 2006ov - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




On the nature of the progenitors of three type II-P supernovae: 2004et, 2006my and 2006ov - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: The pre-explosion observations of the type II-P supernovae 2006my, 2006ov and2004et, are re-analysed. In the cases of supernovae 2006my and 2006ov we arguethat the published candidate progenitors are not coincident with theirrespective supernova sites in pre-explosion Hubble Space Telescopeobservations. We therefore derive upper luminosity and mass limits for theunseen 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-supergiantprogenitor candidate, originally identified in Canada France Hawaii Telescopeimages, is still visible ~3 years post-explosion in observations from theWilliam Herschel Telescope. High-resolution Hubble Space Telescope and GeminiNorth adaptive optics late-time imagery reveal that this source is not asingle yellow supergiant star, but rather is resolved into at least threedistinct sources. We report the discovery of the unresolved progenitor as anexcess of flux in pre-explosion Isaac Newton Telescope i-band imaging.Accounting for the late-time contribution of the supernova using publishedoptical spectra, we calculate the progenitor photometry as the differencebetween the pre- and post-explosion, ground-based observations. We find theprogenitor 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 thesupernova sites will be required to confirm these results.



Author: R. M. Crockett 1 2, S. J. Smartt 1, A. Pastorello 1, J. J. Eldridge 3, A. W. Stephens 4, J. R. Maund 5, S. Mattila 6 1 Queen'

Source: https://arxiv.org/







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