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

Research output: Contribution to journalArticle

  • External authors:
  • S D Bates
  • D Thornton
  • M Bailes
  • E Barr
  • C G Bassa
  • N D R Bhat
  • M Burgay
  • S Burke-Spolaor
  • D J Champion
  • C M L Flynn
  • A Jameson
  • S Johnston
  • M Kramer
  • L Levin
  • A Lyne
  • S Milia
  • C Ng
  • E Petroff
  • A Possenti
  • B W Stappers
  • W van Straten
  • C Tiburzi

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 0.08 M, 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.

Bibliographical metadata

Original languageEnglish
Pages (from-to)4019-4028
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume446
DOIs
Publication statusPublished - Feb 2015