The Transformation of SN1987A into a Supernova Remnant

Columbia University, New York NY

Investigators

Abstract

AST-0206048 Crotts Supernova 1987A, the closest SN seen in nearly four centuries, and the most intensely studied ever, is rapidly turning into a SN remnant as the ejecta from the explosion now strikes the circumstellar envelope shed by the star over the last million years. We propose to observe this process using a combination of optical, IR and UV programs, plus further space-based studies (supported by NASA). These will allow us to map the structure of the envelope, both in its unperturbed state and as it is destroyed by the ejecta. This will allow the first complete study of SN remnant formation evolution ever undertaken. Our previous observations of the 3-D structure, velocities, density and composition will establish the nature of the pre-explosion nebula and the mass loss processes that created it, while the excitation of this nebula by the X and EUV flux created in the collision will allow us to re-analyze it once more. In addition to these unprecedented studies of a SN remnant, will continue to use light echoes from the SN explosion to explore the interstellar medium in the 30 Doradus star-formation region, to study the echo of the UV pulse from SN shock breakout through the progenitor star's surface, and to accurately determine the distance to the Large Magellanic Cloud { a fundamental rung on the extragalactic distance ladder. ***