Formation of the Three-ring Structure Around the Supernova 1987A

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  • D131 超新星 1987A 周縁ガス中の 3 リング構造の形成

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Abstract

From a magnetohydrodynamic simulation, we reproduce a three-ring structure in the circumstellar space of the supemova (SN) 1987A observed by the Hubble Space Telescope. When ta star develops from a red supergiant (RSG) to a blue supergiant (BSG) just before the SN explosion, a wind-wind interaction occurs between the slow stellar wind from the RSG and the subsequent fast stellar wind from the BSG. This process is simulated numerically under an assumption that the density and velocity distributions around the RSG wind are anisotropic owing to thee existence of toroidal magnetic field and coronal holes. The three rings with observed size and and position are reproduced by the magnetic pinch effect and amplification of initial density asymmetry through the dynamical interaction.

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