Precise time series photometry for the Kepler-2.0 mission

Precise time series photometry for the Kepler-2.0 mission
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Kepler-2.0 任务的精确时间序列光度测量

DOI:
10.1093/mnras/stu2638
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发表时间:
2015
影响因子:
4.8
通讯作者:
Aigrain S
Aigrain S
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Aigrain S

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最近批准的NASAK2任务有可能将开普勒在明亮和低质量恒星周围发现的短周期凌日行星的数量增加一个数量级,并彻底改变我们对疏散星团中恒星变化的理解。然而,由于卫星的指向精度降低,数据处理更具挑战性,因为卫星只有两个起作用的反作用轮。我们提出了一种新的方法来提取精确的光变曲线从K2数据,结合列表驱动,软边缘孔径测光与逐星星校正的系统影响与漂移的滚动角的卫星约其botherwise。系统建模的同时,使用半参数高斯过程模型与恒星的内在变化。我们在2014年1月的一次工程测试中收集了一周的数据,对这种方法进行了测试,并进行了检查,以验证我们的方法不会改变固有的变化信号,并计算了精度作为长节奏(30分钟)和行星过境(2.5小时)时间尺度上的星等函数。在这两种情况下,我们达到测光精度接近的精度在nominalKeplermission期间达到的恒星暗于12等,和40和80百万分之一之间的较亮的恒星。这些结果证实了K2在行星探测和表征、星震学和恒星变率研究方面的光明前景。最后,我们进行了基本的凌日搜索的光变曲线,检测到两个真正的凌日类事件,7个分离的食双星和13个经典变量。
The recently approved NASAK2mission has the potential to multiply by an order of magnitude the number of short-period transiting planets found byKepleraround bright and low-mass stars, and to revolutionize our understanding of stellar variability in open clusters. However, the data processing is made more challenging by the reduced pointing accuracy of the satellite, which has only two functioning reaction wheels. We present a new method to extract precise light curves fromK2data, combining list-driven, soft-edged aperture photometry with a star-by-star correction of systematic effects associated with the drift in the roll angle of the satellite about its boresight. The systematics are modelled simultaneously with the stars’ intrinsic variability using a semiparametric Gaussian process model. We test this method on a week of data collected during an engineering test in 2014 January, perform checks to verify that our method does not alter intrinsic variability signals, and compute the precision as a function of magnitude on long-cadence (30 min) and planetary transit (2.5 h) time-scales. In both cases, we reach photometric precisions close to the precision reached during the nominalKeplermission for stars fainter than 12th magnitude, and between 40 and 80 parts per million for brighter stars. These results confirm the bright prospects for planet detection and characterization, asteroseismology and stellar variability studies withK2. Finally, we perform a basic transit search on the light curves, detecting two bona fide transit-like events, seven detached eclipsing binaries and 13 classical variables.
实用的行星勘探
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发表时间: 2010
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