Optimizing the search for transiting planets in long time series
Optimizing the search for transiting planets in long time series
复制标题
优化长时间序列中凌日行星的搜索
DOI：
10.1051/0004-6361/201220860
复制
发表时间：
2014
影响因子：
6.5
通讯作者：
中科院分区：
文献类型：
--
作者：
地面和太空的凌日观测已经积累了大量跨越数年的光变曲线。目的在这些长时间序列中寻找凌日行星是计算密集型的。我们希望优化搜索检测和计算efficiency.MethodsWe假设搜索系统可以很好地描述开普勒轨道。然后，我们传播不同的系统参数的检测parameters.ResultsWe的影响表明，光变曲线的频率信息内容主要是由过境信号的占空比，从而发现最佳的频率采样是立方和非线性。通过考虑相位光变曲线的占空比相关分仓来实现进一步优化。通过使用（标准）BLS，要么对长周期行星相当不敏感，要么对短周期行星不太敏感，计算速度慢了约330倍（对于3年长的数据集）。我们还展示了物理系统参数，如主机星星的大小和质量，直接影响过境检测。这种理解，然后可以用来优化搜索每一个星星individues.ConclusionsBy考虑开普勒动力学明确而不是隐含一个可以优化搜索的BLS参数空间。所提出的最优BLS增强了非常短和非常长周期行星的可探测性，同时允许以大大减少的资源和时间进行这种搜索。提供了Optimal BLS的Matlab/Octave源代码。
ContextTransit surveys, both ground- and space-based, have already accumulated a large number of light curves that span several years.AimsThe search for transiting planets in these long time series is computationally intensive. We wish to optimize the search for both detection and computational efficiencies.MethodsWe assume that the searched systems can be described well by Keplerian orbits. We then propagate the effects of different system parameters to the detection parameters.ResultsWe show that the frequency information content of the light curve is primarily determined by the duty cycle of the transit signal, and thus the optimal frequency sampling is found to be cubic and not linear. Further optimization is achieved by considering duty-cycle dependent binning of the phased light curve. By using the (standard) BLS, one is either fairly insensitive to long-period planets or less sensitive to short-period planetsandcomputationally slower by a significant factor of ~330 (for a 3 yr long dataset). We also show how the physical system parameters, such as the host star’s size and mass, directly affect transit detection. This understanding can then be used to optimize the search for every star individually.ConclusionsBy considering Keplerian dynamics explicitly rather than implicitly one can optimally search the BLS parameter space. The presented Optimal BLS enhances the detectability of both very short and very long period planets, while allowing such searches to be done with much reduced resources and time. The Matlab/Octave source code for Optimal BLS is made available.
DOI：
10.1088/0004-637x/747/2/144
发表时间：
2012
期刊：
The Astrophysical Journal
影响因子：
--
作者：
P. Muirhead;J. Johnson;K. Apps;J. Carter;T. Morton;D. Fabrycky;J. Pineda;M. Bottom;B. Rojas;E. Schlawin;K. Hamren;K. Covey;J. Crepp;K. Stassun;J. Pepper;L. Hebb;E. Kirby;A. Howard;H. Isaacson;G. Marcy;D. Levitan;T. Díaz;L. Armus;J. Lloyd
通讯作者：
J. Lloyd
影响因子：
8.7
作者：
Batalha, Natalie M.;Rowe, Jason F.;Welsh, William F.
通讯作者：
Welsh, William F.