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Cameron, A D; Champion, D J; Kramer, M; Bailes, M; Barr, E D; Bassa, C G; Bhandari, S; Bhat, N D R; Burgay, M; 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, A; Ridolfi, A; Stappers, B W; van Straten, W; Tauris, T M; Tiburzi, C; Wex, N
Monthly Notices of the Royal Astronomical Society Letters, 03/2018, Letnik: 475, Številka: 1Journal Article
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 (mp = 1.3384(9) M⊙ and mc = 1.3946(9) M⊙) 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.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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