The introduction of an exponential or power law gradient
in the interstellar medium (ISM) allows to produce an asymmetric
evolution of the supernova remnant (SNR) when the framework of the thin layer
approximation is adopted. Unfortunately both the exponential and power law
gradients for the ISM do not have a well defined physical meaning. The physics
conversely is well represented by an isothermal self-gravitating disk of
particles whose velocity is everywhere Maxwellian. We derived a law of motion
in the framework of the thin layer approximation with a control parameter of
the swept mass. The photon’s losses, which are often neglected in the thin layer
approximation, are modeled trough velocity dependence. The developed framework
is applied to SNR 1987A and the three observed rings are simulated.
T. Morris and P. Podsiadlowski, “The Triple-Ring Nebula around SN 1987A: Fingerprint of a Binary Merger Science 315, 1103 (Preprint arXiv:astro-ph/0703317) Three Dimensional Evolution of SN 1987A in a Self-Gravitating Disk,” 2007.
L. Zaninetti, “Interaction of Planetary Nebulae, Eta-Carinae and Supernova Remnants with the Interstellar Medium,” In: B. Cancellieri and V Mamedov, Eds., Interstellar Medium: New Research, Nova Publishers, New York, 2012, pp. 91-146.