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http://hdl.handle.net/20.500.12386/27761
Titolo: | The High Time Resolution Universe Pulsar Survey - XIII. PSR J1757-1854, the most accelerated binary pulsar | Autori: | Cameron, A. D. Champion, D. J. Kramer, M. Bailes, M. Barr, E. D. Bassa, C. G. Bhandari, S. Bhat, N. D. R. BURGAY, MARTA Burke-Spolaor, S. Eatough, R. P. Flynn, C. M. L. Freire, P. C. C. Jameson, A. Johnston, S. Karuppusamy, R. Keith, M. J. Levin, L. Lorimer, D. R. Lyne, A. G. McLaughlin, M. A. Ng, C. Petroff, E. POSSENTI, ANDREA RIDOLFI, ALESSANDRO Stappers, B. W. van Straten, W. Tauris, T. M. Tiburzi, C. Wex, N. |
Data pubblicazione: | 2018 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 475 | Fascicolo: | 1 | Da pagina:: | L57 | Abstract: | We report the discovery of PSR J1757-1854, a 21.5-ms pulsar in a highly-eccentric, 4.4-h orbit with a neutron star (NS) companion. PSR J1757-1854 exhibits some of the most extreme relativistic parameters of any known pulsar, including the strongest relativistic effects due to gravitational-wave damping, with a merger time of 76 Myr. Following a 1.6-yr timing campaign, we have measured five post-Keplerian parameters, yielding the two component masses (m<SUB>p</SUB> = 1.3384(9) M<SUB>☉</SUB> and m<SUB>c</SUB> = 1.3946(9) M<SUB>☉</SUB>) plus three tests of general relativity, which the theory passes. The larger mass of the NS companion provides important clues regarding the binary formation of PSR J1757-1854. With simulations suggesting 3-σ measurements of both the contribution of Lense-Thirring precession to the rate of change of the semimajor axis and the relativistic deformation of the orbit within ∼7-9 yr, PSR J1757-1854 stands out as a unique laboratory for new tests of gravitational theories. | URI: | http://hdl.handle.net/20.500.12386/27761 | URL: | https://academic.oup.com/mnrasl/article-abstract/475/1/L57/4794951 | ISSN: | 0035-8711 | DOI: | 10.1093/mnrasl/sly003 | Bibcode ADS: | 2018MNRAS.475L..57C | Fulltext: | open |
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