TY - JOUR
T1 - On the nature of the progenitors of three Type II-P supernovae: 2004et, 2006my and 2006ov
AU - Crockett...[et al.], R.M.
AU - Smartt, S.J.
AU - Pastorello, A.
AU - Ekdridge, J.J.
AU - Maund, Justyn Robert
PY - 2011/2/1
Y1 - 2011/2/1
N2 - 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 (logL/L⊙= 4.51; m < 13M⊙) and 2006ov (logL/L⊙= 4.29; m < 10M⊙). 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 ∼3yr 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+5-1M⊙. In all cases we conclude that future, high-resolution observations of the supernova sites will be required to confirm these results.
AB - 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 (logL/L⊙= 4.51; m < 13M⊙) and 2006ov (logL/L⊙= 4.29; m < 10M⊙). 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 ∼3yr 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+5-1M⊙. In all cases we conclude that future, high-resolution observations of the supernova sites will be required to confirm these results.
U2 - 10.1111/j.1365-2966.2010.17652.x
DO - 10.1111/j.1365-2966.2010.17652.x
M3 - Journal article
SN - 0035-8711
VL - 410
SP - 2767
EP - 2786
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
IS - 4
ER -