We present the discovery of a further five recycled pulsar systems in the mid-Galactic latitude portion of the High Time Resolution Universe (HTRU) Survey. The pulsars have rotational periods ranging from 2 ms to 66 ms, and four are in binary systems with orbital periods between 10.8 hours and 9.0 days. Three of these binary systems are particularly interesting; PSR J1227-6208 has a pulse period of 34.5 ms and the highest mass function of all pulsars with near-circular orbits. The circular orbit suggests that the companion is not another neutron star, so future timing experiments may reveal one of the heaviest white dwarfs ever found ($>$ 1.3 M$_\odot$). Timing observations of PSR J1431$-$4715 indicate that it is eclipsed by its companion which has a mass indicating it belongs to the redback class of eclipsing millisecond pulsars. PSR J1653-2054 has a companion with a minimum mass of only $0.08$ M$_\odot$, placing it among the class of pulsars with low-mass companions. Unlike the majority of such systems, however, no evidence of eclipses is seen at 1.4 GHz.
Digital Commons Citation
Bates, S. D.; Thornton, D.; Bailes, M.; and Levin, L., "The High Time Resolution Universe Survey – Xi. Discovery Of Five Recycled Pulsars And The Optical Detectability Of Survey White Dwarf Companions" (2015). Faculty & Staff Scholarship. 984.
Bates, S. D., Thornton, D., Bailes, M., Levin, L. (2015). The High Time Resolution Universe Survey – Xi. Discovery Of Five Recycled Pulsars And The Optical Detectability Of Survey White Dwarf Companions. Monthly Notices of the Royal Astronomical Society, 446(4), 4019-4028. http://doi.org/10.1093/mnras/stu2350