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Is PSR B0943+10 a low-mass quark star?

Is PSR B0943+10 a low-mass quark star?. Youling Yue( 岳友岭 ), Xiaohong Cui( 崔晓红 ) and Renxin Xu( 徐仁新 ) Astronomy department, Peking University at Nanjing 2006.8. contents. Pulsar, neutron star, quark star PSR B0943+10, quark star model, inclination angle effect Conclusion. Neutron star

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Is PSR B0943+10 a low-mass quark star?

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  1. Is PSR B0943+10 a low-mass quark star? Youling Yue(岳友岭), Xiaohong Cui(崔晓红) and Renxin Xu(徐仁新) Astronomy department, Peking University at Nanjing 2006.8

  2. contents • Pulsar, neutron star, quark star • PSR B0943+10, quark star model, inclination angle effect • Conclusion

  3. Neutron star Normal or Mixed/hybrid (quark core) Quark star Bare or with thin crust Solid (stronger GW emission?) or fluid Which one(s)?Observation What is pulsar Bejger and Haensel 2003

  4. Bejger and Haensel 2003

  5. PSR B0943+10 (P =1 s), one of the best-studied drifting pulsar Deshpande & Rankin 1999

  6. We focus onpulsar sub-pulse drifting and polar gap model

  7. Pulsar emission models • polar gap(e.g., Ruderman & Sutherland 1975/RS75)successful to sub-pulse drifting • space charge-limited flow (e.g., Arons & Scharlemenn 1979) • outer gap (e.g., Cheng et al. 1986) • core gap and annular gap (e.g., Qiao et al. 2004) • …

  8. Success of polar gap model (RS75) e+ e- RS75

  9. Edwards and Stappers 2002

  10. To test the model earth hot spot In x-ray band

  11. X-ray band observation (Zhang et al. 2005) • A_polar = 103m2 (observation) • A_polar = 6x104 m2 (theory, for R=10 km pulsar)

  12. Zhang et al. 2005

  13. To solve the problem • modification of polar gap model • a low mass bare strange quark star • small radius (R = 2.6 km to fit the observation) • No binding energy problembinding energy of ion is nearly infinity (Xu & Qiao 1999)

  14. advantages • RS75： • Only work when • the binding energy problem, need strong B • Our model: • Work for both • Quark star has strong enough binding energy (binding by strong interaction) < 0 and > 0

  15. Problems from potential drop • Phi< 1012 V (critical potential drop) Last open field line 0

  16. Considering inclination angle 0 Last open field line

  17. Results:

  18. Inclination angle In the parameter space rho = 2rho_n A= 103 m2 Phi is well above 1012 V

  19. conclusion • PSR B0943+10 could be a quark star. • The potential drop will be ~100 times larger when considering inclination angle effects.

  20. Thank you

  21. Deshpande & Rankin 2001

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