Authors:
Marcaide J.M., Alberdi A., Ros E., Diamond P., Shapiro I.I., Guirado J.C., Jones D.L., Krichbaum T.P., Mantovani F., Preston R.A., Rius A., Schilizzi R.T., Trigilio C., Whitney A.R., Witzel A.
Abstract:
A sequence of images from very long baseline interferometry shows that the young radio supernova SN 1993J is expanding with circular symmetry. However, the circularly symmetric images show emission asymmetries. A scenario in which freely expanding supernova ejecta shock mostly isotropic circumstellar material is strongly favored. The sequence of images constitutes the first 'movie' of a radio supernova.