Optical and Infrared photometry of the type IIn SN 1998S:Days 11-146

Abstract

We present contemporaneous optical and infrared photometric observations of the type IIn SN 1998S covering the period between 11 and 146 days after discovery. The infrared data constitute the first ever infrared light curves of a type IIn supernova. We use blackbody and spline fits to the photometry to examine the luminosity evolution. During the first 2--3 months, the luminosity is dominated by the release of shock-deposited energy in the ejecta. After $\sim$100 days the luminosity is powered mostly by the deposition of radioactive decay energy from 0.15$\pm$0.05 M${}_{\odot }$ of ${}^{56}$Ni which was produced in the explosion. We also report the discovery of an astonishingly high infrared (IR) excess, $K-L^{\prime }=2.5$, that was present at day 130. We interpret this as being due to thermal emission from dust grains in the vicinity of the supernova. We argue that to produce such a high IR luminosity so soon after the explosion, the dust must be {\it pre-existing} and so is located in the circumstellar medium of the progenitor. The dust could be heated either by the UV/optical flash (IR echo) or by the X-rays from the interaction of the ejecta with the circumstellar material

(accepted in MNRAS, 12 pages, 9 figures, MNRAS style file included)

References in corpus (3)

• Evidence for Asphericity in the Type IIn Supernova 1998S
• Detection of CO and Dust Emission in Near-Infrared Spectra of SN 1998S
• Interstellar and Circumstellar Optical & Ultraviolet Lines Towards SN1998S

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