The Unusual Binary Pulsar PSR J1744-3922

Details The Unusual Binary Pulsar PSR J1744-3922 The Unusual Binary Pulsar PSR J1744-3922

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...6e..18b&link_type=abstract

Neutron Stars and Black Holes in Star Clusters, 26th meeting of the IAU, Joint Discussion 6, 17-18 August 2006, Prague, Czech Re

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We report on the study of PSR J1744-3922, a Galactic field binary pulsar exhibiting an unusual combination of characteristics in comparison with other MSPs: a relatively long spin period (172 ms), a relatively high magnetic field (1.7e10 G), a short orbital period (4.6 h) and a light companion (Mmin = 0.08 Msun). These properties are not explained by any of the standard evolution models. This suggests that PSR J1744-3922 has a peculiar evolution history. A few other Galactic field binary pulsars show similar orbital and spin characteristics and we suggest they formed in a related way. Possible formation mechanisms would be: the pulsar originating as a high-magnetic field pulsar; common envelope accretion from a low-mass star that might evolve in an ultra-compact X-ray binary; the accretion-induced collapse of a massive white dwarf. We note that PSR J1744-3922 resembles the unusual globular cluster pulsar PSR B1718-19 that has also been proposed to have been formed by accretion-induced collapse.

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