HUBBLE-SPACE-TELESCOPE OBSERVATIONS OF THE SN 1987A TRIPLE RING NEBULA

We have observed SN 1987A with the optically corrected WFPC2 on the Hu bble Space Telescope both in emission lines and in the UV and optical continuum. The previously observed outer nebular structure is shown to be part of two closed unresolved loops. These loops were flash-ionize d by the supernova itself. They are not caused by limb brightening of an hourglass shell produced by the interaction of the winds from the p rogenitor. The inner ring is seen to be extended and may be connected to the new outer rings by sheets of material. However, beyond the oute r rings, emission is not seen, implying a very low density (n < 10) fo r the outer hourglass shell if it exists. The new outer rings are unre solved, and this together with their observed brightness implies a den sity n > 1000. This density contrast of at least 100 is difficult to r econcile with the conventional picture of the progenitor evolution. Tw o models for the rings are presented, but each is deficient in importa nt respects. A proper understanding of this system will require new ph ysical insight.