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The High Time Resolution Universe Pulsar Survey - XIII. PSR J1757-1854, the most accelerated binary pulsar | | A. D. Cameron
; D. J. Champion
; M. Kramer
; M. Bailes
; E. D. Barr
; S. Bhandari
; N. D. R. Bhat
; M. Burgay
; S. Burke-Spolaor
; R. P. Eatough
; C. M. L. Flynn
; P. C. C. Freire
; A. Jameson
; S. Johnston
; R. Karuppusamy
; M. J. Keith
; L. Levin
; D. R. Lorimer
; A. G. Lyne
; M. A. McLaughlin
; C. Ng
; E. Petroff
; A. Possenti
; A. Ridolfi
; B. W. Stappers
; W. van Straten
; T. M. Tauris
; C. Tiburzi
; N. Wex
; | | Date: |
21 Nov 2017 | | Abstract: | We report the discovery of PSR J1757$-$1854, a $21.5$-ms pulsar in a
highly-eccentric, $4.4$-h orbit around a neutron star (NS) companion. PSR
J1757$-$1854 exhibits some of the most extreme relativistic parameters of any
known pulsar, including the strongest relativistic effects due to
gravitational-wave (GW) damping, with a merger time of 76 Myr. Following a
1.6-yr timing campaign, we have measured five post-Keplerian (PK) parameters,
yielding the two component masses ($m_ ext{p}=1.3384(9), ext{M}_odot$ and
$m_ ext{c}=1.3946(9), ext{M}_odot$) plus three tests of general relativity
(GR), which the theory passes. The large mass of the NS companion provides
important clues regarding the binary formation of PSR J1757$-$1854. With
simulations suggesting 3-$sigma$ measurements of both the contribution of
Lense-Thirring precession to the rate of change of the semi-major axis and the
relativistic deformation of the orbit within $sim7-9$ years, PSR J1757$-$1854
stands out as a unique laboratory for new tests of gravitational theories. | | Source: | arXiv, 1711.7697 | | Services: | Forum | Review | PDF | Favorites | |
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