Circumstellar interaction in supernovae in dense environments - an observational perspective

Abstract

In a supernova explosion, the ejecta interacting with the surrounding circumstellar medium (CSM) give rise to variety of radiation. Since CSM is created from the mass lost from the progenitor star, it carries footprints of the late time evolution of the star. This is one of the unique ways to get a handle on the nature of the progenitor star system. Here, I will focus mainly on the supernovae (SNe) exploding in dense environments, a.k.a. Type IIn SNe. Radio and X-ray emission from this class of SNe have revealed important modifications in their radiation properties, due to the presence of high density CSM. Forward shock dominance of the X-ray emission, internal free-free absorption of the radio emission, episodic or non-steady mass loss rate, asymmetry in the explosion seem to be common properties of this class of SNe.

Fixed minor typos. 31 pages, 9 figures, accepted for publication in Space Science Reviews. Chapter in International Space Science Institute (ISSI) Book on "Supernovae" to be published in Space Science Reviews by Springer

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• The Exceptional X-ray Evolution of SN1996cr in High Resolution
• How do supernova remnants cool? -- I. Morphology, optical emission lines, and shocks
• First Detection of X-Ray Line Emission from Type IIn Supernova 1978K with XMM-Newton's RGS
• Spitzer's Last Look at Extragalactic Explosions: Long-Term Evolution of Interacting Supernovae