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Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..937..112c&link_type=abstract
SUPERNOVA 1987A: 20 YEARS AFTER: Supernovae and Gamma-Ray Bursters. AIP Conference Proceedings, Volume 937, pp. 112-119 (2007).
Other
Supernova Remnants, Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers, Supernovae, Magellanic Clouds And Other Irregular Galaxies, Spectroscopy And Spectrophotometry
Scientific paper
I summarize how high-resolution spectroscopy has provided velocity information, light echoes have provided three-dimensional spatial data, and together they produce some of the more constraining timescale information regarding the formation of SN 1987A's circumstellar envelope. Since this envelope also provides the boundary conditions for the formation of Supernova Remnant 1987A, I also touch on how our same data has begun to illucidate that process.
Echoes and high-resolution spectroscopy reveal the three-ring nebula within an hour-glass nebular shape that itself sits within an extended, elongated nebula reaching typically to radii of 5 pc from the SN, with several layers of structure in between. Velocity information supplies kinematic ages for the three rings (and presumably the hourglass) of about 20,000 years before the SN explosion, and >~350,000 years for the outer nebula.
We use evolution of ``hot spot'' fluxes in the innermost ring to infer simply the shape of small structures on the inner surface of that ring where the ejecta of the SN explosion are colliding. Also, we use polarimetry of the structure of the circumstellar nebula to find a new, geometric distance measure to SN 1987A and hence the Large Magellanic Cloud.
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