Two populations of X-ray pulsars produced by two types of supernova

Christian Knigge (), Malcolm J. Coe and Philipp Podsiadlowski
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Christian Knigge: University of Southampton, School of Physics and Astronomy
Malcolm J. Coe: University of Southampton, School of Physics and Astronomy
Philipp Podsiadlowski: University of Oxford

Nature, 2011, vol. 479, issue 7373, 372-375

Abstract: Supernova families divided Most neutron stars are formed in either iron-core collapse supernovae or electron-capture supernovae. Until now, it has not been possible to differentiate between the neutron stars produced by these two precursors. That may change with the discovery of two distinct sub-populations of Be/X-ray binary pulsars with different characteristic spin and orbital periods, and orbital eccentricities. The two sub-populations are most likely to be associated with the two distinct types of neutron-star-forming supernovae, with electron-capture events preferentially producing short orbital and spin periods in low-eccentricity systems.

Date: 2011
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DOI: 10.1038/nature10529

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