Follow-up Timing of 12 Pulsars Discovered in Commensal Radio Astronomy FAST Survey

• DOI: 10.3847/1538-4357/ad79f4
• Publication Date: 2024-10-30T08:50:19Z
• Authors: D. Zhao; J. P. Yuan; N. Wang; D. Li; P. Wang; M. Y. Xue; W. W. Zhu; C. C. Miao; W. M. Yan; J. B. Wang; J. M. Yao; Q. D. Wu; S. Q. Wang; S. N. Sun; F. F. Kou; Y. T. Chen; S. J. Dang; Y. Feng; Z. J. Liu; X. L. Miao; L. Q. Meng; M. Yuan; C. H. Niu; J. R. Niu; L. Qian; S. Wang; X. Y. Xie; Y. F. Xiao; Y. L. Yue; S. P. You; X. H. Yu; R. S. Zhao; R. Yuen; X. Zhou; L. Zhang; M. Xie; Y. X. Li; Y. B. Wang; Z. K. Luo; Z. Y. Gan; Z. Y. Sun; M. M. Chi; C. J. Wang
• Keywords: Radio Astronomy

Abstract We present phase-connected timing ephemerides, polarization pulse profiles, and Faraday rotation measurements of 12 pulsars discovered by the Five-hundred-meter Aperture Spherical radio Telescope (FAST) in Commensal Radio Astronomy FAST Survey. The observational data for each pulsar span at least 1 yr. Among them, PSR J1840+2843 shows subpulse drifting, five are detected to exhibit nulling phenomena. J0640−0139 J2031−1254 isolated millisecond (MSPs) with stable spin-down rates ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover accent="true"> <mml:mrow> <mml:mi>P</mml:mi> </mml:mrow> <mml:mo>̇</mml:mo> </mml:mover> </mml:math> ) 4.8981(6) × 10 −20 s −1 6.01(2) −21 , respectively. Additionally, one (PSR J1602−0611) is a neutron star−white dwarf (WD) binary system an 18.23-day orbit companion ≤0.65 M ⊙ . J1602−0611 has spin period, mass, orbital eccentricity that consistent theoretical expectations MSP−helium WD (He WD) systems. Therefore, we believe it might be MSP−He system. locations J1751−0542 on <mml:mo>−</mml:mo> diagram beyond traditional death line. This indicates some low- <mml:mi>E</mml:mi> pulsars, contributing new samples testing radiation theories. estimated distances these based NE2001 YMW16 electron density models, our work enhances set investigating model Galaxy.