论文标题
Gaia-verse I的完整性：盖亚在DR2期间何时何地在天空上？
Completeness of the Gaia-verse I: when and where were Gaia's eyes on the sky during DR2?
论文作者
论文摘要
Gaia太空任务正在制作革命性的天文学，光度和光谱目录，这些目录将使我们能够绘制我们的星系，但前提是我们知道该目录的Gaia-verses的完整性：它包含什么恒星，而缺少什么恒星？我们认为，完整性是由盖亚（Gaia）的旋转和不必要的扫描定律驱动的，并将在本系列的盖亚（Gaia-verse）中应用这一原则。我们迈出了第一步，确定没有对Gaia DR2贡献任何测量的时期；这些差距会在天空中产生不完整的丝带，这将使忽略它们的任何研究偏见，尽管其中一些差距可能填补了未来的数据发行。我们的第一种方法是使用可变星光度法来识别超过一天1％的94个间隙。我们的第二种方法是预测天空上每个点的观察次数，与报道的检测数量相比，这表明天体和光谱学中的其他空白。做出这些预测要求我们对盖亚扫描法做出最精确，公开的确定。使用这项扫描法，我们进一步确定，大多数恒星比$ g = 22 $ in DR2中的恒星较为虚弱，这是由于在马德里雷暴而导致的雷暴造成的误解，因此具有伪造的幅度。我们的差距和精确扫描定律清单将使天文学家知道盖亚的眼睛何时真正在第二个数据发布期间真正在其二进制恒星，系外行星或微验证事件上。
The Gaia space mission is crafting revolutionary astrometric, photometric and spectroscopic catalogues that will allow us to map our Galaxy, but only if we know the completeness of this Gaia-verse of catalogues: what stars does it contain and what stars is it missing? We argue that the completeness is driven by Gaia's spinning-and-precessing scanning law and will apply this principle to the Gaia-verse over this series. We take a first step by identifying the periods in time that did not contribute any measurements to Gaia DR2; these gaps create ribbons of incompleteness across the sky that will bias any study that ignores them, although some of these gaps may be filled in future data releases. Our first approach was to use the variable star photometry to identify the 94 gaps longer than 1% of a day. Our second approach was to predict the number of observations of every point on the sky, which in comparison to the reported number of detections revealed additional gaps in the astrometry and spectroscopy. Making these predictions required us to make the most precise, publicly-available determination of the Gaia scanning law. Using this scanning law, we further identified that most stars fainter than $G=22$ in DR2 have spurious magnitudes due to a miscalibration resulting from a thunderstorm over Madrid. Our list of gaps and precision scanning law will allow astronomers to know when Gaia's eye was truly on their binary star, exoplanet or microlensing event during the time period of the second data release.
