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arXiv · 1112.2507

Probing the neutron star spin evolution in the young SMC Be/X-ray binary SXP 1062

S. B. Popov·R. Turolla
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Abstract

The newly discovered Be/X-ray binary in the Small Magellanic Cloud, SXP 1062, provides the first example of a robust association with a supernova remnant (SNR). The short age estimated for the SNR qualifies SXP 1062 as the youngest known source in its class, tau ~ 1e4 yr. As such, it allows to test current models of magneto-rotational evolution of neutron stars ina still unexplored regime. Here we discuss possible evolutionary scenarios for SXP 1062 in the attempt to reconcile its long spin period, P=1062 s, and short age. Although several options can be considered, like an anomalously long initial period or the presence of a fossil disc, our results indicate that SXP 1062 may host a neutron star born with a large initial magnetic field, typically in excess of ~ 1e14 G, which then decayed to ~ 1e13 G.

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S. B. Popov, R. Turolla. 2012-01-09. Probing the neutron star spin evolution in the young SMC Be/X-ray binary SXP 1062. https://doi.org/10.1111/j.1745-3933.2012.01220.x

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