eRASSUJ060839.5-704014：一个位于大麦哲伦云方向的双简并超致密双星
eRASSUJ060839.5-704014: A double degenerate ultra-compact binary in the direction of the LMC
AI总结：
本研究通过eROSITA巡天发现LMC方向的超软X射线源eRASSU J060839.5-704014，结合多波段后续与存档观测，确认其为位于LMC前景的罕见AM CVn型双简并超致密双星，对Ia型超新星前身研究和引力波探测有重要价值。
摘要：
研究背景：在四次全天巡天（eRASS1--4）期间，Spektrum-Roentgen-Gamma（SRG）卫星搭载的软X射线仪器eROSITA在大麦哲伦云（LMC）方向探测到一个新的超软X射线源eRASSU J060839.5-704014。研究方法：我们安排了X射线和光学波段的后续观测，并进一步检索了存档观测数据以揭示该天体的本质。研究结果：我们发现了周期约374秒的脉动，其脉冲轮廓与100%调制的特征一致。我们在eROSITA数据中识别出另外两个周期性信号，经确认它们是eROSITA光变曲线采样导致的假频。我们在XMM-牛顿卫星的光学/紫外监测器以及托洛洛山美洲际天文台的暗能量相机获取的UVW1波段和g、r、i、z波段图像中，找到了该X射线源的多波段对应体。该源的计时和光谱特征与位于LMC前景的双简并超致密双星系统相符。eRASSU J060839.5-704014属于一类罕见的AM CVn型天体，这类天体对于研究Ia型超新星前身以及持续引力波探测具有重要意义。研究结论：我们确认eRASSU J060839.5-704014是一个位于LMC前景的新的双简并超致密双星。
英文摘要：
Context. During four all-sky surveys (eRASS1--4), eROSITA, the soft X-ray instrument aboard Spektrum-Roentgen-Gamma (SRG) detected a new supersoft X-ray source, eRASSU J060839.5-704014, in the direction of the Large Magellanic Cloud (LMC). Methods. We arranged follow-up observations in the X-ray and optical wavelengths and further searched in archival observations to reveal the nature of the object. Results. We discover pulsations at ~374 s with a pulse profile consistent with 100% modulation. We identify two other periodicities in the eROSITA data, which we establish as aliases due to the sampling of the eROSITA light curve. We identify a multi-wavelength counterpart to the X-ray source in UVW1 and g, r, i, and z images obtained by the optical/UV monitor on XMM-Newton and the Dark Energy Camera at the Cerro Tololo Inter-American Observatory. The timing and spectral characteristics of the source are consistent with a double degenerate ultra-compact binary system in the foreground of the LMC. eRASSU J060839.5-704014 belongs to a rare class of AM CVns, which are important to study in the context of progenitors of SN Ia and for persistent gravitational wave detection. Conclusions. We identify eRASSU J060839.5-704014 as a new double degenerate ultra-compact binary located in the foreground of the LMC.
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。
