The High Time Resolution Universe Pulsar Survey - XIII. PSR J1757-1854, the most accelerated binary pulsar
Date Issued
2018
Author(s)
Cameron, A. D.
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Champion, D. J.
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Kramer, M.
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Bailes, M.
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Barr, E. D.
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Bassa, C. G.
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Bhandari, S.
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Bhat, N. D. R.
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•
Burke-Spolaor, S.
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Eatough, R. P.
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Flynn, C. M. L.
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Freire, P. C. C.
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Jameson, A.
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Johnston, S.
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Karuppusamy, R.
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Keith, M. J.
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Levin, L.
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Lorimer, D. R.
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Lyne, A. G.
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McLaughlin, M. A.
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Ng, C.
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Petroff, E.
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•
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Stappers, B. W.
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van Straten, W.
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Tauris, T. M.
•
•
Wex, N.
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.
Volume
475
Issue
1
Start page
L57
Issn Identifier
0035-8711
Ads BibCode
2018MNRAS.475L..57C
Rights
open.access
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