CoRoT数据的噪声特性：行星发现前景
Noise properties of the CoRoT data: a planet-finding perspective
摘要：
在这篇简短的论文中，我们研究了恒星光变曲线的光度精度的CoRoT卫星在其行星发现通道，特别强调的时间尺度特征的行星凌日。连同其他文章在同一问题上的这本杂志，它形成了一个尝试提供积木的统计解释的CoRoT行星和日食的二进制捕获日期。在对光变曲线进行预处理以最大限度地减少长期变化和离群值之后，我们使用迭代非线性滤波器测量了持续超过1个月的前三次CoRoT运行中光变曲线的散射，以隔离感兴趣的时间尺度上的信号。噪声在2 h时间尺度上的表现被很好地描述为幂律，其指数为0.25（R-幅度），范围从R=11.5时的0.1 mmag到R=16时的1 mmag，这接近于发射前的规格，尽管由于残留抖动噪声和热像素事件，仍比光子噪声高2-3倍。有证据表明，随着时间的推移，性能略有下降。我们发现明确的证据增强的变化小时的时间尺度（在0.5 mmag的水平），在恒星确定为可能的巨人从他们的R-星等和B-V颜色，这代表约60%和20%的观测人口的方向上的天鹰座和麒麟座分别。另一方面，矮星在2小时内的平均相关噪音水平非常低，在明亮的一端达到0.05毫等。
英文摘要：
In this short paper, we study the photometric precision of stellar light curves obtained by the CoRoT satellite in its planet finding channel, with a particular emphasis on the timescales characteristic of planetary transits. Together with other articles in the same issue of this journal, it forms an attempt to provide the building blocks for a statistical interpretation of the CoRoT planet and eclipsing binary catch to date. After pre-processing the light curves so as to minimise long-term variations and outliers, we measure the scatter of the light curves in the first three CoRoT runs lasting more than 1 month, using an iterative non-linear filter to isolate signal on the timescales of interest. The bevhaiour of the noise on 2h timescales is well-described a power-law with index 0.25 in R-magnitude, ranging from 0.1mmag at R=11.5 to 1mmag at R=16, which is close to the pre-launch specification, though still a factor 2-3 above the photon noise due to residual jitter noise and hot pixel events. There is evidence for a slight degradation of the performance over time. We find clear evidence for enhanced variability on hours timescales (at the level of 0.5 mmag) in stars identified as likely giants from their R-magnitude and B-V colour, which represent approximately 60 and 20% of the observed population in the direction of Aquila and Monoceros respectively. On the other hand, median correlated noise levels over 2h for dwarf stars are extremely low, reaching 0.05mmag at the bright end.
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