Rotational evolution of young pulsars due to superfluid decoupling
Nature Physics, ISSN: 1745-2481, Vol: 8, Issue: 11, Page: 787-789
2012
- 61Citations
- 25Captures
- 2Mentions
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Most Recent News
Southampton researchers explain how pulsars slow down with age
Researchers at the University of Southampton have developed a model which explains how the spin of a pulsar slows down as the star gets older.
Article Description
Pulsars are rotating neutron stars that are seen to slow down, and the spin-down rate is thought to be due to magnetic dipole radiation. This leads to a prediction for the braking index n, which is a combination of the spin period and its first and second time derivatives. However, all observed values of n are below the predicted value of 3. Here we provide a simple model that can explain the rotational evolution of young pulsars, including the n=2.51 of the 958-year-old pulsar in the Crab nebula. The model is based on a decrease in the effective moment of inertia due to an increase in the fraction of the stellar core that becomes superfluid as the star cools through neutrino emission. The results suggest that future large radio monitoring campaigns of pulsars will yield measurements of the neutron star mass, nuclear equation of state and superfluid properties. © 2012 Macmillan Publishers Limited. All rights reserved.
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