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19 Years Timing of J1713+0747

19 Years Timing of J1713+0747. Weiwei Zhu NANOGrav Timing Group 2012-08-22. J1713+0747. One of the longest/best timed pulsars ~52ns time precision and improving, (Demorest et al. 2012, this work) 19 years total time span P = 4.6ms, P b = 68 day (Foster et al. 1993 ). ABPP (86ns).

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19 Years Timing of J1713+0747

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  1. 19 Years Timing of J1713+0747 Weiwei Zhu NANOGrav Timing Group 2012-08-22

  2. J1713+0747 • One of the longest/best timed pulsars • ~52ns time precision and improving, (Demorest et al. 2012, this work) • 19 years total time span • P= 4.6ms, Pb = 68 day (Foster et al. 1993) ABPP(86ns) Mark4(152ns) Mark3(441ns) ASP(52ns) GASP(136ns)

  3. What can we do with this pulsar? • Constrain gravitational wave background level • Great laboratory for testing fundamental physics principles • Strong equivalence principle • Lorenz invariance/conservation of momentum • Excellent strong-field test for Einstein’s general relativity and constrains for alternative theories.

  4. Gravitational Wave Background Level • 5-Year single pulsar GW upper limit A1~10-14(Demorest et al. 2012), a factor of a fewhigher than the limit from all pulsars. • A new single-pulsar GW background limit may be derived from our 19 years timing solution. Demorest et al .2012

  5. Testing Fundamental Physics Principles-- Test Strong Equivalence Principle 1.4Mʘ 0.3Mʘ Damour & Schafer 1991; Wex 1997, 2000; Bell & Damour 1996; Stairs 2003; Splaver et al. 2005; Gonzalez et al. 2011; (Stairs et al. 2005, Gonzalez et al. 2011)

  6. Existence of A Preferred Frame? Preferred Frame • A preferred Frame breaks down Lorenz Invariance/conservation of momentum. • Acceleration and forced eccentricity. (Stairs et al. 2005, Gonzalez et al. 2011)

  7. Measuring --Orbital Inclination & Orientation • Shapiro Delay: • Mpulsar= 1.40.1 Mʘ • MWD = 0.300.02 Mʘ • i = 71 1 • Measuring 𝑥 ̇ : • Ω = 93 • Other Parameters: • PMRA,PMDEC  V Ω i Kopeikin 1996)

  8. Test Fundamental Physics Principles • (95%CL; Stairs et al. 2005; Gonzalez et al. 2011 based on 27 binary MSPs, including J1713) • (95%CL; Stairs et al. 2005; Gonzalez et al. 2011 ) Markov Chain Monte Carlo estimation of the parameters Blue: Other pulsar binaries (Gonzalez et al 11) Red: J1713+0747

  9. The Changing Pb – test Einstein’s GR 52ns precision/68 day orbital period  measuring the slowest fractional change over time Einstein’s GR: (:Kinematic effect; :Gravitational Wave) All consistent with Einstein’s general theory of relativity [J0437-4715, Deller et al. 08] [J1012+5307, Lazaridis et al. 09] [J1738+0333, Freire et al. 12] [J1713+0747, this work, 68%CL]

  10. Constrain Alternate Theory of Gravitation Lunar Laser Ranging; Hofmann et al. 2010 J0437&J1738; Freire et al 2012 J0437&J1738; Freire et al 2012 Our Constraint based on J1012, J1738 and J1713: Constraint based on J1012 J1738 and J1713

  11. Summary As one of the best high-precision pulsars, J1713+0747 can: • strongly constrain gravitational wave background level • test fundamental physical principles • test/constrain theories of General Relativity

  12. Thank You

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