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Abstract: I summarize what we have learned about the nature of stars that ultimatelyexplode as core-collapse supernovae from the examination of images taken priorto the explosion. By registering pre-supernova and post-supernova images,usually taken at high resolution using either space-based optical detectors, orground-based infrared detectors equipped with laser guide star adaptive opticssystems, nearly three dozen core-collapse supernovae have now had theproperties of their progenitor stars either directly measured or morecommonly constrained by establishing upper limits on their luminosities. Thesestudies enable direct comparison with stellar evolution models that, in turn,permit estimates of the progenitor stars- physical characteristics to be made.I review progenitor characteristics or constraints inferred from this workfor each of the major core-collapse supernova types II-Plateau, II-Linear,IIb, IIn, Ib-c, with a particular focus on the analytical techniques used andthe processes through which conclusions have been drawn. Brief discussion of afew individual events is also provided, including SN 2005gl, a type IInsupernova that is shown to have had an extremely luminous - and thus verymassive - progenitor that exploded shortly after a violent, luminous bluevariable-like eruption phase, contrary to standard theoretical predictions.



Author: Douglas C. Leonard San Diego State University

Source: https://arxiv.org/







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