We report on the discovery of Swift J010902.6-723710, a rare eclipsing Be/X-ray Binary system by the Swift SMC Survey (S-CUBED). Swift J010902.6-723710 was discovered via weekly S-CUBED monitoring observations when it was observed to enter a state of X-ray outburst on 2023 October 10. X-ray emission was found to be modulated by a 182 s period. Optical spectroscopy is used to confirm the presence of a highly inclined circumstellar disk surrounding a B0-0.5Ve optical companion. Historical UV and IR photometry is then used to identify strong eclipse-like features reoccurring in both light curves with a 60.623 day period, which is adopted as the orbital period of the system. Eclipsing behavior is found to be the result of a large accretion disk surrounding the neutron star. Eclipses are produced when the disk passes in front of the OBe companion, blocking light from both the stellar surface and circumstellar disk. This is only the third Be/X-ray binary to have confirmed eclipses. We note that this rare behavior provides an important opportunity to constrain the physical parameters of a Be/X-ray binary with greater accuracy than is possible in noneclipsing systems.

中文翻译：

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发现罕见的食 Be/X 射线双星系统，Swift J010902.6-723710 = SXP 182

我们报告了 Swift SMC 巡天 (S-CUBED) 发现的罕见的食 Be/X 射线双星系统 Swift J010902.6-723710。 Swift J010902.6-723710是通过每周S-CUBED监测观测发现的，当时观察到它在2023年10月10日进入X射线爆发状态。X射线发射被发现受到182秒周期的调制。光谱学用于确认 B0-0.5Ve 光学伴星周围存在高度倾斜的星周盘。然后使用历史紫外和红外光度测量来识别在两条光曲线中重复出现的强烈的日食特征，周期为 60.623 天，该周期被采用作为系统的轨道周期。人们发现食食行为是中子星周围大型吸积盘的结果。当圆盘经过 OBe 伴星前面时，就会产生日食，阻挡来自恒星表面和星周圆盘的光线。这只是第三个已确认发生日食的 Be/X 射线双星。我们注意到，这种罕见的行为提供了一个重要的机会，可以比非剪切系统更精确地约束 Be/X 射线双星的物理参数。