Portal de Periódicos da CAPES

PSR J1829+2456: a relativistic binary pulsar

2004; Oxford University Press; Volume: 350; Issue: 4 Linguagem: Inglês

10.1111/j.1365-2966.2004.07862.x

1365-2966

D. J. Champion, D. R. Lorimer, M. A. McLaughlin, J. M. Cordes, Zaven Arzoumanian, J. M. Weisberg, J. H. Taylor,

Gamma-ray bursts and supernovae

We report the discovery of a new binary pulsar, PSR J1829+2456, found during a mid-latitude drift-scan survey with the Arecibo telescope. Our initial timing observations show the 41-ms pulsar to be in a 28-h, slightly eccentric, binary orbit. The advance of periastron yr −1 is derived from our timing observations spanning 200 d. Assuming that the advance of periastron is purely relativistic and a reasonable range of neutron star masses for PSR J1829+2456, we constrain the companion mass to be between 1.22 and 1.38 M⊙, making it likely to be another neutron star. We also place a firm upper limit on the pulsar mass of 1.38 M⊙. The expected coalescence time due to gravitational wave emission is long (∼60 Gyr), and this system will not significantly impact upon calculations of merger rates that are relevant to upcoming instruments such as LIGO.