An Empirical Bayesian Approach to Limb Darkening in Modeling WASP-121b Transit Light Curves
文献类型：期刊论文
| 作者 | Yang,Fan1,2,4,6; Long,Richard J.3,5; Liu,Ji-feng2,4; Shan,Su-su2,4; Guo,Rui2,4 ; Zhang,Bo6; Yi,Tuan7; Zheng,Ling-Lin7; Zhao,Zhi-Chao6
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| 刊名 | The Astronomical Journal
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| 出版日期 | 2021-06-01 |
| 卷号 | 161期号:6 |
| 关键词 | Exoplanet atmospheres Exoplanet detection methods Transit photometry Exoplanet systems |
| ISSN号 | 0004-6256 |
| DOI | 10.3847/1538-3881/abf92f |
| 英文摘要 | Abstract We present a novel, iterative method using an empirical Bayesian approach for modeling the limb-darkened WASP-121b transit from the TESS light curve. Our method is motivated by the need to improve Rp/R* estimates for exoplanet atmosphere modeling and is particularly effective with the limb-darkening (LD) quadratic law requiring no prior central value from stellar atmospheric models. With the nonlinear LD law, the method has all the advantages of not needing atmospheric models but does not converge. The iterative method gives a different Rp/R* for WASP-121b at a significance level of 1σ when compared with existing noniterative methods. To assess the origins and implications of this difference, we generate and analyze light curves with known values of the LD coefficients (LDCs). We find that noniterative modeling with LDC priors from stellar atmospheric models results in an inconsistent Rp/R* at a 1.5σ level when the known LDC values are the same as those previously found when modeling real data by the iterative method. In contrast, the LDC values from the iterative modeling yield the correct value of Rp/R* to within 0.25σ. For more general cases with different known inputs, Monte Carlo simulations show that the iterative method obtains unbiased LDCs and correct Rp/R* to within a significance level of 0.3σ. Biased LDC priors can cause biased LDC posteriors and lead to bias in the Rp/R* of up to 0.82%, 2.5σ for the quadratic law and 0.32%, 1.0σ for the nonlinear law. Our improvement in Rp/R* estimation is important when analyzing exoplanet atmospheres. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-6256-161-6-ABF92F |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/56921]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Yang,Fan |
| 作者单位 | 1.IPAC, Caltech, KS 314-6, Pasadena, CA 91125, USA 2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China 3.Department of Astronomy, Tsinghua University, Beijing 100084, People's Republic of China 4.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100101, People's Republic of China sailoryf1222@gmail.com, sailoryf@nao.cas.cn, jfliu@nao.cas.cn 5.Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL, UK 6.Department of Astronomy, Beijing Normal University, Beijing 100875, People's Republic of China 7.Department of Astronomy, Xiamen University, Xiamen, Fujian 361005, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Yang,Fan,Long,Richard J.,Liu,Ji-feng,et al. An Empirical Bayesian Approach to Limb Darkening in Modeling WASP-121b Transit Light Curves[J]. The Astronomical Journal,2021,161(6). |
| APA | Yang,Fan.,Long,Richard J..,Liu,Ji-feng.,Shan,Su-su.,Guo,Rui.,...&Zhao,Zhi-Chao.(2021).An Empirical Bayesian Approach to Limb Darkening in Modeling WASP-121b Transit Light Curves.The Astronomical Journal,161(6). |
| MLA | Yang,Fan,et al."An Empirical Bayesian Approach to Limb Darkening in Modeling WASP-121b Transit Light Curves".The Astronomical Journal 161.6(2021). |
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来源：国家天文台
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