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Evolutionary Link between X-ray Pulsars and Millisecond Radio Pulsars

Evolutionary Link between X-ray Pulsars and Millisecond Radio Pulsars. 李向东 南京大学天文学系 2009-7-30. Radio Pulsars -Rotation Powered. X-ray Pulsars -Accretion Powered. HMXBs. LMXBs. The Recycled Scenario. Spin Periods. X-ray pulsars. Millisecond X-ray Pulsars. Binary Pulsar Population.

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Evolutionary Link between X-ray Pulsars and Millisecond Radio Pulsars

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  1. Evolutionary Link between X-ray Pulsars and Millisecond Radio Pulsars 李向东 南京大学天文学系 2009-7-30

  2. Radio Pulsars-Rotation Powered

  3. X-ray Pulsars-Accretion Powered HMXBs LMXBs

  4. The Recycled Scenario Spin Periods X-ray pulsars

  5. Millisecond X-ray Pulsars

  6. Binary Pulsar Population

  7. Binary Pulsar Population Breton 2009

  8. Stellar Evolution

  9. Stellar Evolution

  10. Evolution of HMXBs • Unstable mass transfer and common Envelope evolution

  11. Evolution of LMXBs • Nuclear evolution • Mass and angular momentum loss

  12. Formation Channel (1) TZO TZO Single NS

  13. Formation Channel (2)

  14. Observations vs. Theories Too long Porb or too small M2? Black widow pulsars? Deloye 2008

  15. Problems with LMXB Evolution • The formation of LMXBs requires a contrived evolution with • extreme initial mass ratio • ejection of a massive common envelope by a low-mass star • survival as a bound system after the SN

  16. Problems with LMXB Evolution • Birthrate problem (Kulkarni & Narayan 1988) • NLMXB ~ 100, τLMXB ~ 10^9 yr • NBMSP ~ 10^5, τBMSP ~ 10^9-10^10 yr • NBMSP /τBMSP ~ 10-100 NLMXB /τLMXB

  17. Problems with LMXB Evolution • Mass and angular momentum loss Andronov et al. (2001) Lattimer (2007)

  18. Problems with LMXB Evolution • Luminosity distribution Podsiadlowski et al. 2002

  19. PSR J1903+0327 • In the Galactic plane • Ps=2.15 ms Porb=95 days • Mpsr~1.74 Msun • M2~1 Msun • e = 0.44!

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