Linear polarization as a consequence of rotation in exploding stars

Details Linear polarization as a consequence of rotation in exploding stars Linear polarization as a consequence of rotation in exploding stars

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..641s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 2, p. 641-654.

Astronomy and Astrophysics

Astrophysics

11

Explosions, Hydrodynamic Equations, Linear Polarization, Shock Wave Interaction, Stellar Rotation, Supernova 1987A, Angular Velocity, Astronomical Models, Light Curve, Two Dimensional Models

Scientific paper

A set of 2D hydrodynamic simulations of the propagation of spherically initiated shock waves in the hydrogen-rich envelope of a rotating massive stars was performed. Mass, extension, and rotational velocity of these models were selected to represent the observed quantities of the SN 1987A progenitor. By deposition of internal energy at the center of the star a spherical shock wave was initiated. Due to the steeper density gradient in the polar direction the shock wave takes on a prolate shape and passes the star's surface at the poles first. The interaction of the prolate shock wave with the oblate density stratification causes a second shock wave moving from the poles to the equator. The transport of energy and momentum by this shock gives rise to a free expanding object with the prolate inner and an oblate outer density stratification. It is shown that within the framework of the present model the progenitor must rotate differentially to explain the observed polarization.

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