来自南半球的 V Gru 双星系统首个多波段测光光变曲线解
The First Multiband Photometric Light Curve Solutions of the V Gru Binary System from the Southern Hemisphere
AI总结：
本文利用澳大利亚15夜 BVI 观测和两个扇区 TESS 数据，借助 PHOEBE 2.4.7 与 MCMC 方法首次给出南半球 V Gru 近接食双星的多波段测光解、热斑模型、极小值时刻及历表变化趋势。
摘要：
本研究给出了南半球对短周期 V Gru 食双星的首个多波段测光解。该系统的光变曲线是在澳大利亚 Congarinni 天文台通过 BVI 滤光片历经15个夜晚观测获得的。除新的地基数据外，我们还使用了两个扇区的 TESS 观测。我们利用 PHysics Of Eclipsing BinariEs（PHOEBE）2.4.7 版本代码分析了该系统的光变曲线，以实现与测光观测的最佳吻合。这些解表明，V Gru 是一个近接双星系统，质量比 q=1.302(81)，f1=0.010(23)，f2=-0.009(21)，倾角 i=73.45(38)。在光变曲线分析中，我们在较热和较冷的两个子星上均考虑了热斑。我们基于马尔可夫链蒙特卡洛（MCMC）方法从光变曲线中提取了极小值时刻。利用我们的新光变曲线、TESS 数据以及额外的文献极小值，我们计算了 V Gru 的历表。该系统的食计时变化趋势通过 MCMC 方法确定。该系统是未来研究中一个良好且具有挑战性的案例。
英文摘要：
The first multiband photometric solutions of the short-period V Gru eclipsing binary from the southern hemisphere is presented in this study. Light curves of the system were observed through BVI filters at the Congarinni Observatory in Australia for 15 nights. In addition to the new ground-based data, we also used the TESS observations in two sectors. We analyzed the light curves of the system using the PHysics Of Eclipsing BinariEs (PHOEBE) 2.4.7 version code to achieve the best accordance with the photometric observations. The solutions suggest that V Gru is a near-contact binary system with q=1.302(81) mass ratio, f1=0.010(23), f2=-0.0.009(21), and i=73.45(38). We considered the two hot spots on the hotter and cooler components for the light curve analysis. We extracted the minima times from the light curves based on the Markov Chain Monte Carlo (MCMC) approach. Using our new light curves, TESS, and additional literature minima, we computed the ephemeris of V Gru. The system's eclipse timing variation trend was determined using the MCMC method. This system is a good and challenging case for future studies.
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