ANALYSIS OF RADIAL VELOCITY DATA BY A NOVEL ADAPTIVE APPROACH

ANALYSIS OF RADIAL VELOCITY DATA BY A NOVEL ADAPTIVE APPROACH
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通过新颖的自适应方法分析径向速度数据

DOI:
10.1088/0004-6256/139/2/783
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发表时间:
2010
期刊:
The Astronomical Journal
影响因子:
--
通讯作者:
J. Ge
J. Ge
中科院分区:
--
文献类型:
--
作者:
P. Babu;P. Stoica;J. Li;Z. Chen;J. Ge

文献摘要

被引文献

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在本文中,我们介绍了一种估计技术,用于分析径向速度数据中经常遇到的太阳系外行星的检测。我们讨论了径向速度数据测量的Keplerian模型,并介绍了一种名为迭代自适应方法(IAA)的技术来估计径向速度数据的三维谱(功率与偏心率、轨道周期和近星点通过时间)。然后,我们讨论了不同的方法来规范的IAA算法中存在的噪声和测量误差。我们还简要讨论了计算方面的方法,并介绍了一个计算效率的版本IAA。最后,我们建立了显着的谱峰,通过使用松弛最大似然算法和广义似然比测试。数值实验进行了模拟和真实的生活数据集,以评估我们的方法的性能。讨论的真实的数据集是恒星HD 63454、HD 208487和GJ 876的径向速度测量值。
In this paper, we introduce an estimation technique for analyzing radial velocity data commonly encountered in extrasolar planet detection. We discuss the Keplerian model for radial velocity data measurements and introduce a technique named the iterative adaptive approach (IAA) to estimate the three-dimensional spectrum (power versus eccentricity, orbital period and periastron passage time) of the radial velocity data. We then discuss different ways to regularize the IAA algorithm in the presence of noise and measurement errors. We also discuss briefly the computational aspects of the method and introduce a computationally efficient version of IAA. Finally, we establish the significance of the spectral peaks by using a relaxation maximum likelihood algorithm and a generalized likelihood ratio test. Numerical experiments are carried out on both simulated and real life data sets to evaluate the performance of our method. The real life data sets discussed are radial velocity measurements of the stars HD 63454, HD 208487, and GJ 876.