Analysis of the Type IIn Supernova 1998S: Effects of Circumstellar Interaction on Observed Spectra

Abstract

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.

arXiv commentto appear in ApJ, 2001, 547

References in corpus (5)

• Evidence for Asphericity in the Type IIn Supernova 1998S
• Optical and Infrared photometry of the type IIn SN 1998S:Days 11-146
• Detection of CO and Dust Emission in Near-Infrared Spectra of SN 1998S
• Supernova Resonance-Scattering Profiles in the Presence of External Illumination
• Interstellar and Circumstellar Optical & Ultraviolet Lines Towards SN1998S

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