Modulations in the radio light curve of the Type IIb supernova 2001ig: evidence for a Wolf-Rayet binary progenitor?

@article{Ryder2004ModulationsIT,
  title={Modulations in the radio light curve of the Type IIb supernova 2001ig: evidence for a Wolf-Rayet binary progenitor?},
  author={Stuart D. Ryder and Elaine M. Sadler and Ravi Subrahmanyan and Kurt W. Weiler and Nino Panagia and Christopher Stockdale},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2004},
  volume={349},
  pages={1093-1100}
}
We describe the radio evolution of supernova (SN) 2001ig in NGC 7424, from 700 d of multifrequency monitoring with the Australia Telescope Compact Array (ATCA) and the Very Large Array (VLA). We find that deviations of the radio light curves at each frequency from the standard ‘minishell’ model are consistent with density modulations in the circumstellar medium (CSM), which seem to recur with a period near 150 d. One possibility is that these are due to enhanced mass loss from thermal pulses in… 

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