Spin-Down of Radio Millisecond Pulsars at Genesis

Details Spin-Down of Radio Millisecond Pulsars at Genesis Spin-Down of Radio Millisecond Pulsars at Genesis

2012-02-02

arxiv.org/abs/1202.0551v2

Science 335, 561-563 (2012)

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Published in Science, 3 February, 2012 (30 pages, 4 figures, reference numbers corrected in SOM, Fig.2 rotated)

Scientific paper

10.1126/science.1216355

Millisecond pulsars are old neutron stars that have been spun up to high rotational frequencies via accretion of mass from a binary companion star. An important issue for understanding the physics of the early spin evolution of millisecond pulsars is the impact of the expanding magnetosphere during the terminal stages of the mass-transfer process. Here I report binary stellar evolution calculations that show that the braking torque acting on a neutron star, when the companion star decouples from its Roche-lobe, is able to dissipate >50% of the rotational energy of the pulsar. This effect may explain the apparent difference in observed spin distributions between x-ray and radio millisecond pulsars and help account for the noticeable age discrepancy with their young white dwarf companions.

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