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首页> 外文期刊>The Astrophysical Journal. Supplement Series >Kepler mission stellar and instrument noise properties
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Kepler mission stellar and instrument noise properties

机译：开普勒任务恒星和仪器的噪声特性

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Kepler mission results are rapidly contributing to fundamentally new discoveries in both the exoplanet and asteroseismology fields. The data returned from Kepler are unique in terms of the number of stars observed, precision of photometry for time series observations, and the temporal extent of high duty cycle observations. As the first mission to provide extensive time series measurements on thousands of stars over months to years at a level hitherto possible only for the Sun, the results from Kepler will vastly increase our knowledge of stellar variability for quiet solar-type stars. Here, we report on the stellar noise inferred on the timescale of a few hours of most interest for detection of exoplanets via transits. By design the data from moderately bright Kepler stars are expected to have roughly comparable levels of noise intrinsic to the stars and arising from a combination of fundamental limitations such as Poisson statistics and any instrument noise. The noise levels attained by Kepler on-orbit exceed by some 50% the target levels for solar-type, quiet stars. We provide a decomposition of observed noise for an ensemble of 12th magnitude stars arising from fundamental terms (Poisson and readout noise), added noise due to the instrument and that intrinsic to the stars. The largest factor in the modestly higher than anticipated noise follows from intrinsic stellar noise. We show that using stellar parameters from galactic stellar synthesis models, and projections to stellar rotation, activity, and hence noise levels reproduce the primary intrinsic stellar noise features.
机译：开普勒任务的结果正在迅速促进系外行星和星震学领域的根本新发现。从开普勒返回的数据在观测到的恒星数量，用于时间序列观测的光度学精度以及高占空比观测的时间范围方面是独一无二的。开普勒的结果是第一个任务，即在数月至数年的时间内，对数千个恒星进行广泛的时间序列测量，其测量水平迄今只能达到太阳，开普勒的结果将极大地增加我们对安静太阳型恒星的恒星变异性的认识。在这里，我们报告了在经过转运检测系外行星最感兴趣的几个小时的时间尺度上推断出的恒星噪声。通过设计，预计来自中等明亮开普勒星的数据将具有与这些恒星固有的噪声大致相当的水平，并且是由诸如泊松统计和任何仪器噪声之类的基本限制共同产生的。开普勒在轨获得的噪声水平比太阳型安静恒星的目标水平高出约50％。我们提供了由基本项（泊松和读数噪声）引起的12级星集合的观测噪声分解（由于泊松和读出噪声），由于仪器造成的附加噪声以及恒星固有的噪声。适度高于预期噪声的最大因素来自内在恒星噪声。我们显示，使用来自银河恒星合成模型的恒星参数，以及对恒星旋转，活动和因此的噪声水平的投影，可以再现主要的固有恒星恒星噪声特征。

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