Discovery of Two Relativistic Neutron Star–White Dwarf Binaries | Zendy

R. T. Edwards | Zendy; M. Bailes | Zendy

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Discovery of Two Relativistic Neutron Star–White Dwarf Binaries

Author(s) -

R. T. Edwards,

M. Bailes

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/318893

Subject(s) - millisecond pulsar , physics , white dwarf , pulsar , neutron star , astrophysics , binary pulsar , astronomy , gravitational wave , pulsar planet , x ray pulsar , coalescence (physics) , stars

We have discovered two recycled pulsars in relativistic orbits as part of thefirst high-frequency survey of intermediate Galactic latitudes. PSR J1157-5112is a 44 ms pulsar and the first recycled pulsar with an ultra-massive (M > 1.14Mo) white dwarf companion. Millisecond pulsar J1757-5322 is a relativisticcircular-orbit system which will coalesce due to the emission of gravitationalradiation in less than 9.5 Gyr. Of the ~40 known circular orbit pulsars,J1757-5322 and J1157-5112 have the highest projected orbital velocities. Thereare now three local neutron-star/white-dwarf binaries that will coalesce inless than a Hubble time, implying a large coalescence rate for these objects inthe local Universe. Systems such as J1141-6545 (Kaspi et al. 2000) arepotential gamma-ray burst progenitors and dominate the coalescence rate, whilstlighter systems make excellent progenitors of millisecond pulsars withplanetary or ultra-low mass companions.Comment: 4 pages, to appear in ApJ Letters. Uses aastex v 5.0, emulateapj5.sty, apjfonts.st

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