Book contents
- Frontmatter
- Contents
- Preface
- Conference Photograph
- Conference Participants
- Part one Stellar Evolution and Wind Theory
- Part two Wolf-Rayet Ring Nebulae
- Part three Supernovae
- Supernovae and their circumstellar environment
- Radio supernovae and progenitor winds
- Circumstellar interaction in supernovae
- SN progenitor winds
- Supernovae with dense circumstellar winds
- Compact supernova remnants
- The evolution of compact supernova remnants
- Massive supernovae in binary systems
- The progenitor of SN 1993J
- Narrow lines from SN 1993J
- UV spectroscopy of SN 1993J
- Ryle Telescope observations of SN 1993J
- SN 1993J – early radio emission
- The circumstellar gas around SN 1987A and SN 1993J
- X-ray emission from SN 1987A and SN 1993J
- The interstellar medium towards SN 1993J in M81
- Part four Asymptotic Giant Branch stars
- Part five Planetary Nebulae
- Part six Novae and Symbiotic Stars
- Poster Papers
- Author Index
- Object Index
Supernovae and their circumstellar environment
from Part three - Supernovae
Published online by Cambridge University Press: 07 September 2010
- Frontmatter
- Contents
- Preface
- Conference Photograph
- Conference Participants
- Part one Stellar Evolution and Wind Theory
- Part two Wolf-Rayet Ring Nebulae
- Part three Supernovae
- Supernovae and their circumstellar environment
- Radio supernovae and progenitor winds
- Circumstellar interaction in supernovae
- SN progenitor winds
- Supernovae with dense circumstellar winds
- Compact supernova remnants
- The evolution of compact supernova remnants
- Massive supernovae in binary systems
- The progenitor of SN 1993J
- Narrow lines from SN 1993J
- UV spectroscopy of SN 1993J
- Ryle Telescope observations of SN 1993J
- SN 1993J – early radio emission
- The circumstellar gas around SN 1987A and SN 1993J
- X-ray emission from SN 1987A and SN 1993J
- The interstellar medium towards SN 1993J in M81
- Part four Asymptotic Giant Branch stars
- Part five Planetary Nebulae
- Part six Novae and Symbiotic Stars
- Poster Papers
- Author Index
- Object Index
Summary
Abstract
Some supernovae are visible for several years past explosion. The main energy source for this sustained emission conies from the supernova shock interacting with the remnant of the stellar wind of the progenitor star. We review the available evidence for this picture and exclude other power sources on the basis of the radiated energies. We also discuss a group of supernovae which display narrow emission lines with high fluxes in their spectra and very slowly declining optical light curves. These observations can most readily be explained as being due to interaction with a very dense medium close to the supernova.
Introduction
A variety of supernova interactions with circumstellar material (CSM) has been observed to date. The best, and most direct, example is the ring of emission around SN 1987A (Jakobsen et al. 1991). This material has been ionized by the UV and soft X-ray flash of the shock breakout at the surface of the supernova (Fransson et al. 1989, Lundqvist & Fransson 1989). The density enhancement in the ring is caused by the interaction of the fast blue supergiant wind colliding with the slow red supergiant wind of a previous epoch (Blondin & Lundqvist 1993). In the case of SN 1993J, the early detection of radio and X-ray emission, in combination with narrow emission lines in the UV and optical, are indicative of interaction with the CSM. Blue optical continua, X-ray detection at early phases, as well as the UV emission have been proposed as characteristics of a shock in the CSM around SN 1979C (Fransson 1984).
- Type
- Chapter
- Information
- Circumstellar Media in Late Stages of Stellar Evolution , pp. 100 - 111Publisher: Cambridge University PressPrint publication year: 1994
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