Kavli Affiliate: Lijing Shao
| First 5 Authors: Lingqi Meng, Lingqi Meng, , ,
| Summary:
We conducted high-precision timing of PSR J1946+2052 to determine the masses
of the two neutron stars in the system, test general relativity (GR) and
assessed the system’s potential for future measurement of the moment of inertia
of the pulsar. We analysed seven years of timing data from the Arecibo 305-m
radio telescope, the Green Bank Telescope (GBT), and the Five-hundred-meter
Aperture Spherical radio Telescope (FAST). The data processing accounted for
dispersion measure variations and relativistic spin precession-induced profile
evolution. We employed both DDFWHE and DDGR binary models to measure the spin
parameters, kinematic parameters and orbital parameters. The timing campaign
has resulted in the precise measurement of five post-Keplerian parameters,
which yield very precise masses for the system and three tests of general
relativity. One of these is the second most precise test of the radiative
properties of gravity to date: the intrinsic orbital decay, $dotP_rm
b,int=-1.8288(16)times10^-12rm,s,s^-1$, represents $1.00005(91)$ of
the GR prediction, indicating that the theory has passed this stringent test.
The other two tests, of the Shapiro delay parameters, have precisions of 6%
and 5% respectively; this is caused by the moderate orbital inclination of the
system, $sim 74^circ$; the measurements of the Shapiro delay parameters
also agree with the GR predictions. Additionally, we analysed the higher-order
contributions of $dotomega$, including the Lense-Thirring contribution.
Both the second post-Newtonian and the Lense-Thirring contributions are larger
than the current uncertainty of $dotomega$
($deltadotomega=4times10^-4,rm deg,yr^-1$), leading to the
higher-order correction for the total mass.
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