PSR J1756−2251: a pulsar with a low-mass neutron star companion

The pulsar PSR J1756−2251 resides in a relativistic double neutron star binary system with a 7.67-h orbit. We have conducted long-term precision timing on more than 9 yr of data acquired from five telescopes, measuring five post-Keplerian parameters. This has led to several independent tests of gene...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2014-09, Vol.443 (3), p.2183-2196
Main Authors: Ferdman, R. D., Stairs, I. H., Kramer, M., Janssen, G. H., Bassa, C. G., Stappers, B. W., Demorest, P. B., Cognard, I., Desvignes, G., Theureau, G., Burgay, M., Lyne, A. G., Manchester, R. N., Possenti, A.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics
Double stars
Neutron stars
Pulsars
Sciences of the Universe
Solar and Stellar Astrophysics
Space telescopes
Star & galaxy formation
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Summary:The pulsar PSR J1756−2251 resides in a relativistic double neutron star binary system with a 7.67-h orbit. We have conducted long-term precision timing on more than 9 yr of data acquired from five telescopes, measuring five post-Keplerian parameters. This has led to several independent tests of general relativity (GR), the most constraining of which shows agreement with the prediction of GR at the 4 per cent level. Our measurement of the orbital decay rate disagrees with that predicted by GR, likely due to systematic observational biases. We have derived the pulsar distance from parallax and orbital decay measurements to be $0.73_{-0.24}^{+0.60}\,$ kpc (68 per cent) and 
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stu1223