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arXiv 2103.03140astro-ph.SRgr-qc
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用TESS资料分析食双星拱点运动:I.引力理论的检验

Analysis of apsidal motion in eclipsing binaries using TESS data: I. A test of gravitational theories

D. Baroch, A. Giménez, I. Ribas, J. C. Morales, G. Anglada-Escudé, A. Claret

摘要:

食双星近星点辐角的变化,由经典效应和相对论效应引起的拱点运动,可以从一次日食和二次日食的最小光照时间差的变化来测量。差的拱点运动速率测定和经典项中的大的不确定性阻碍了以前的尝试,以足够的精度来确定广义相对论项,以测试广义相对论的预测。作为TESS任务的产物,现在可以获得数千个来自食双星的高精度光变曲线。使用一个合适的研究良好的偏心食双星系统的选择,我们的目标是确定他们的拱点运动速率和关键的引力参数的限制。我们计算时间的最小光从TESS光变曲线的15个食双星精确的绝对参数和预期的广义相对论贡献的总拱线运动速率大于60%。我们使用随时间变化的主日食和次日食时间差来计算拱点运动速率,如果可能的话,或者根据主日食和次日食计算的线性周期之间的差异。为了获得更大的时间基线,我们将高精度TESS计时与存档可靠计时相结合。本文测定了9颗食双星的拱点运动速率,其中5颗为首次报道。由此,我们能够测量6个系统的广义相对论拱点运动速率,其精度足以首次检验广义相对论。这个测试探索了一个以前没有探测过的引力和势能的机制。我们发现完美的协议与理论预测,我们能够设置严格的约束参数化后牛顿形式主义的两个参数。

英文摘要:

The change in the argument of periastron of eclipsing binaries, i.e., the apsidal motion caused by classical and relativistic effects, can be measured from variations in the difference between the time of minimum light of the primary and secondary eclipses. Poor apsidal motion rate determinations and large uncertainties in the classical term have hampered previous attempts to determine the general relativistic term with sufficient precision to test General Relativity predictions. As a product of the TESS mission, thousands of high-precision light curves from eclipsing binaries are now available. Using a selection of suitable well-studied eccentric eclipsing binary systems, we aim to determine their apsidal motion rates and place constraints on key gravitational parameters. We compute the time of minimum light from the TESS light curves of 15 eclipsing binaries with precise absolute parameters and with an expected general relativistic contribution to the total apsidal motion rate greater than 60%. We use the changing primary and secondary eclipse timing differences over time to compute the apsidal motion rate, when possible, or the difference between the linear periods as computed from primary and secondary eclipses. For a greater time baseline we carefully combine the high-precision TESS timings with archival reliable timings. We determine the apsidal motion rate of 9 eclipsing binaries, 5 of which are reported for the first time. From these, we are able to measure the general relativistic apsidal motion rate of 6 systems with sufficient precision to test General Relativity for the first time using this method. This test explores a regime of gravitational forces and potentials that had not been probed earlier. We find perfect agreement with the theoretical predictions, and we are able to set stringent constraints on two parameters of the parametrised post-Newtonian formalism.

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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