A possible model of pulsar timing

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Presentation transcript:

A possible model of pulsar timing Biping Gong Collaborator Yaping Li KIAA Oct 19, 2012

quasi-periodic feature?

Possible mechanisms free precession exact period un-modeled companion Random processes quasi-periodic feature? multi-planets ?

Long-term orbital effects? geodetic precession of spin axis , BO equation Like the effect of free precession, it also predicts a periodic timing delay, without considering the motion of the orbital plane.

BO’s two-body equation negligible

AK’s two-body equation (J=const) J=L+S=const （J=const ?） Just with the basic binary parameters like, orbital period, mass, and spin parameters like, spin angular momentum, we have the following results.

PSR B1540-06

PSR B1828-11

PSR B0919+06

PSR B1826-17

PSR J1931+2421

Companion star? Are there binary pulsars with Spin angular momentum， - Orbital period，0.20-0.34 hr Companion mass，0.16-0.68 solar mass Are there binary pulsars with orbital period less than 90min ?

4U 1626-67 an evidence of such a scenario?

Thanks!