Braking PSR J1734–3333 with a possible fall-back disk |
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作者姓名: | Xiong-Wei Liu Ren-Xin Xu Guo-Jun Qiao Jin-Lin Han Hao Tong |
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作者单位: | School of Physics,China West Normal University;School of Physics and State Key Laboratory of Nuclear Physics and Technology,Peking University;National Astronomical Observatories,Chinese Academy of Sciences;Xinjiang Astronomical Observatory,Chinese Academy of Sciences |
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基金项目: | Supported by the National Natural Science Foundation of China |
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摘 要: | The very small braking index of PSR J1734–3333,n=0.9±0.2,challenges the current theories of braking mechanisms in pulsars.We present a possible interpretation that this pulsar is surrounded by a fall-back disk and braked by it.A modified braking torque is proposed based on the competition between the magnetic energy density of the pulsar and the kinetic energy density of the fall-back disk.With this torque,a self-similar disk can fit all the observed parameters of PSR J1734–3333with natural initial values of parameters.In this regime,the star will evolve to the region having anomalous X-ray pulsars and soft gamma repeaters in the P˙P diagram in about 20 000 years and stay there for a very long time.The mass of the disk around PSR J1734–3333 in our model is about 10M⊕,similar to the observed mass of the disk around AXP 4U 0142+61.
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关 键 词: | pulsars individual(PSR J1734–3333)–stars evolution–stars neutron |
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