潮汐对红背系统PSR 1723-2837轨道演变的影响
Effect of tides on the orbital evolution of the redback system PSR 1723-2837
摘要：
密近双星系统中恒星演化的标准模型假定在质量转移事件中系统处于同步和循环状态。值得注意的是，红背系统PSR J 1723 -2837的轨道周期导数$\dot{P}_{orb}$太大，无法用这个模型来解释。出于这一事实，我们调查的行动之间的两个连续的质量传递事件的系统辐射反馈，这是一个合理的祖先PSR J1723-2837的潮汐力。我们的分析的基础上小屋的治疗平衡潮汐演变，一般考虑捐助者作为一个两层的对象，可能不会旋转作为一个刚体。本文还分析了粘性系数与潮汐强迫频率的三种不同关系。我们发现，大值测量$\dot{P}_{orb}$可以达到的系统，捐助者的恒星旋转速度慢（百分之几）比轨道后，质量转移事件。Van Staden和Antoniadis观测到了这个天体，并报告说它缺乏同步性，这与小屋理论解释观测到的$\dot{P}_{orb}$所要求的同步性相反。出于这种差异，我们分析了航天器开普勒第二次任务K2获得的测光数据，目的是确定PSR J1723-2837中存在的周期。我们注意到有几个周期与轨道和自转的周期很接近。所得到的周期模式揭示了一个更复杂的现象，这将不会很好地描述在弱摩擦模型的框架内的平衡潮汐的存在。
英文摘要：
The standard model of stellar evolution in Close Binary Systems assumes that during mass transfer episodes the system is in a synchronised and circularised state. Remarkably, the redback system PSR J1723-2837 has an orbital period derivative $\dot{P}_{orb}$ too large to be explained by this model. Motivated by this fact, we investigate the action of tidal forces in between two consecutive mass transfer episodes for a system under irradiation feedback, which is a plausible progenitor for PSR J1723-2837. We base our analysis on Hut's treatment of equilibrium tidal evolution, generalised by considering the donor as a two layers object that may not rotate as a rigid body. We also analyse three different relations for the viscosity with the tidal forcing frequency. We found that the large value measured for $\dot{P}_{orb}$ can be reached by systems where the donor star rotates slower (by few percent) than the orbit just after mass transfer episodes. Van Staden & Antoniadis have observed this object and reported a lack of synchronism, opposite to that required by the Hut's theory to account for the observed $\dot{P}_{orb}$. Motivated by this discrepancy, we analyse photometric data obtained by the spacecraft Kepler second mission K2, with the purpose of identifying the periods present in PSR J1723-2837. We notice several periods close to those of the orbit and the rotation. The obtained periods pattern reveals the presence of a more complex phenomenology, which would not be well described in the frame of the weak friction model of equilibrium tides.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
