Early-time spectra of supernovae and their precursor winds: the luminous blue variable/yellow hypergiant progenitor of SN 2013cu

@article{Groh2014EarlytimeSO,
  title={Early-time spectra of supernovae and their precursor winds: the luminous blue variable/yellow hypergiant progenitor of SN 2013cu},
  author={Jose H. Groh},
  journal={arXiv: High Energy Astrophysical Phenomena},
  year={2014}
}
  • J. Groh
  • Published 22 August 2014
  • Physics
  • arXiv: High Energy Astrophysical Phenomena
We present the first quantitative spectroscopic modeling of an early-time supernova that interacts with its progenitor wind. Using the radiative transfer code CMFGEN, we investigate the recently-reported 15.5 h post-explosion spectrum of the type IIb SN 2013cu. For the first time, we are able to directly measure the chemical abundances of a SN progenitor and find a relatively H-rich wind, with H and He abundances (by mass) of X=0.46 +- 0.2 and Y=0.52 +- 0.2, respectively. The wind is enhanced… 

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