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The High Time Resolution Universe survey - XI. Discovery of five recycled pulsars and the optical detectability of survey white dwarf companions

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Authors
Bates, S.
Thornton, D.
Bailes, M.
Barr, E.
Bassa, C.
Bhat, Ramesh
Burgay, M.
Burke-Spolaor, S.
Champion, D.
Flynn, C.
Jameson, A.
Johnston, S.
Keith, M.
Kramer, M.
Levin, L.
Lyne, A.
Milia, S.
Ng, C.
Petroff, E.
Possenti, A.
Stappers, B.
van Straten, W.
Tiburzi, C.
Date
2015
Type
Journal Article

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Bates, S. and Thornton, D. and Bailes, M. and Barr, E. and Bassa, C. and Bhat, R. and Burgay, M. et al. 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): pp. 4019-4028.
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Monthly Notices of the Royal Astronomical Society
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Curtin Institute of Radio Astronomy (Physics)
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This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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Abstract

We present the discovery of a further five recycled pulsar systems in the mid-Galactic latitude portion of the High Time Resolution Universe survey. The pulsars have rotational periods ranging from 2 to 66 ms, and four are in binary systems with orbital periods between 10.8 h and 9 d. 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☉). 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 0.08M☉, 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.