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arXiv 2403.09595astro-ph.HEastro-ph.SR
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LMC X-4 轨道演化的综合研究:轨道周期二阶导数的存在性

A comprehensive study of orbital evolution of LMC X-4: Existence of a second derivative of the orbital period

Chetana Jain, Rahul Sharma, Biswajit Paul

AI总结:

本研究通过多卫星数据综合分析LMC X-4的轨道演化,首次在吸积X射线脉冲星系统中确认轨道周期二阶导数,并测得轨道周期演化时间尺度约0.8 Myr,偏心率上限为0.009。

摘要:

我们在此报告利用 Rossi X射线定时探测器、XMM-Newton、NuSTAR 和 AstroSat 的观测,对食双星高质量X射线双星脉冲星 LMC X-4 进行脉冲到达时间延迟分析的结果。将这些观测确定的轨道参数与可追溯至1998年的历史测量相结合,我们将 LMC X-4 的 $T_{π/2}$ 历元历史延长了约4600个双星轨道,跨越约18年。我们还利用 MAXI-GSC 和 Swift-BAT 的宽视场X射线监测器数据报告了中食时间测量($T_{ecl}$)。将新的 $T_{π/2}$ 和 $T_{ecl}$ 估计值与所有先前报告的值相结合,我们显著改进了轨道演化测量,结果表明轨道周期正以约0.8 Myr 的时间尺度($P_{\rm orb}/\dot{P}_{\rm orb}$)演化。我们首次在吸积X射线脉冲星系统中确认了轨道周期二阶导数的存在,其演化时间尺度($\dot{P}_{orb}/\ddot{P}_{orb}$)约为55年。LMC X-4 中轨道周期二阶导数的探测使其轨道演化时间尺度更加不确定,这可能也适用于其他高质量X射线双星(HMXB)。利用中食数据和脉冲定时数据独立求解的轨道演化测量结果彼此一致,并帮助我们为双星系统的偏心率设定了0.009的上限。

英文摘要:

We report here results from pulse arrival time delay analysis of the eclipsing high mass X-ray binary pulsar LMC X-4 using observations made with the Rossi X-ray Timing Explorer, XMM-Newton, NuSTAR and AstroSat. Combining the orbital parameters determined from these observations with the historical measurements dating back to 1998, we have extended the $T_{π/2}$ epoch history of LMC X-4 by about 4600 binary orbits spanning about 18 years. We also report mid-eclipse time measurements ($T_{ecl}$) using data obtained from wide-field X-ray monitors of MAXI-GSC and Swift-BAT. Combining the new $T_{π/2}$ and $T_{ecl}$ estimates with all the previously reported values, we have significantly improved the orbital evolution measurement, which indicates that the orbital period is evolving at a time scale ($P_{\rm orb}/\dot{P}_{\rm orb}$ ) of about 0.8 Myr. For the first time in an accreting X-ray pulsar system, we confirm the existence of a second derivative of the orbital period, having an evolution time scale ($\dot{P}_{orb}/\ddot{P}_{orb}$) of about 55 yr. Detection of a second derivative of the orbital period in LMC X-4 makes its orbital evolution timescale more uncertain, which may also be true for other HMXBs. Independent solutions for the orbital evolution measurement using the mid-eclipse data and the pulse timing data are consistent with each other, and help us put an upper limit of 0.009 on the eccentricity of the binary system.

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。

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