Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-10-30
Astronomy and Astrophysics
Astrophysics
to appear in ApJ, 2001, 547
Scientific paper
10.1086/318363
We present spectral analysis of early observations of the Type IIn supernova 1998S using the general non-local thermodynamic equilibrium atmosphere code \tt PHOENIX}. We model both the underlying supernova spectrum and the overlying circumstellar interaction region and produce spectra in good agreement with observations. The early spectra are well fit by lines produced primarily in the circumstellar region itself, and later spectra are due primarily to the supernova ejecta. Intermediate spectra are affected by both regions. A mass-loss rate of order $\dot M \sim 0.0001-0.001$\msol yr$^{-1}$ is inferred for a wind speed of 100-1000 \kmps. We discuss how future self-consistent models will better clarify the underlying progenitor structure.
Baron Eddie
Bastian Nate
Branch David
Challis Peter M.
Filippenko Alexei V.
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