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The Crab Nebula's progenitor

Abstract

The study of supernovae is hampered by an insufficient knowledge of the initial stellar mass for individual supernova. Because of large uncertainties in estimating both the total mass of a remnant (including the pulsar or black hole) and any mass loss during the pre-supernova stages, the main sequence mass of the progenitor cannot be accurately determined from observations alone. To calculate an initial mass, one must rely on a combination of both theory and observation. Limits on the progenitor's mass range can be estimated by the presence of a compact remnant and comparison of the observed nebular chemical abundances with detailed evolutionary calculations1. The Crab Nebula is an excellent choice for investigation because it contains a unique combination of characteristics: a central neutron star (pulsar) and a bright, well studied nebula having little or no swept-up interstellar material. In fact, several studies1–4 have suggested an initial mass of 10M for the Crab progenitor. Recently, Davidson et al.5, quoting two of us (K.N. and W.M.S.), state that the Crab's progenitor had a mass slightly larger than 8 M. Here we present in detail the reasoning behind this statement and suggest the explosion mechanism.

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Nomoto, K., Sparks, W., Fesen, R. et al. The Crab Nebula's progenitor. Nature 299, 803–805 (1982). https://doi.org/10.1038/299803a0

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