The Influence of Stellar Contamination on the Interpretation of Near-infrared Transmission Spectra of Sub-Neptune Worlds around M-dwarfs
The Influence of Stellar Contamination on the Interpretation of Near-infrared Transmission Spectra of Sub-Neptune Worlds around M-dwarfs
复制标题
恒星污染对 M 矮星周围海王星下世界近红外透射光谱解释的影响
DOI：
10.3847/1538-4357/ab612e
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
M. Line
中科院分区：
文献类型：
--
作者：
A. Iyer;M. Line
未被遮蔽的恒星表面的不均匀性的影响，在一个过境行星的光谱上的冷点和热光斑的形式一直是一个令人生畏的问题，表征系外行星的大气。恒星表面的不均匀性的波长依赖性印上他们的签名行星传输光谱是特别关注的亚海王星轨道M-矮星系统。在这里，我们提出了一个系统的探索这种斑点污染的影响模拟近红外透射光谱的亚海王星行星。从我们的分析中，我们发现，恒星表面的不均匀性的传输光谱的不适当的校正，可以导致显着的偏差时，推断行星大气的性质。然而，对于较低的异质性分数（<1%），这种偏差可以忽略不计。此外，我们发现，获得恒星的异质性的先验知识，并没有提高精度，在约束行星参数，如果异质性适当边缘化检索;然而，这些条件是我们的信心恒星大气模型的真实光球的准确表示。总之，获得公正的约束时，用詹姆斯·韦伯太空望远镜表征行星大气，我们建议执行联合检索的磁盘集成光谱的星星和恒星污染校正的透射光谱。
The impact of unocculted stellar surface heterogeneities in the form of cool spots and hot faculae on the spectrum of a transiting planet has been a daunting problem for the characterization of exoplanet atmospheres. The wavelength-dependent nature of stellar surface heterogeneities imprinting their signatures on planetary transmission spectra are of concern particularly for systems of sub-Neptunes orbiting M-dwarfs. Here we present a systematic exploration of the impact of this spot-contamination on simulated near-infrared transmission spectra of sub-Neptune planets. From our analysis, we find that improper correction for stellar surface heterogeneities on transmission spectra can lead to significant bias when inferring planetary atmospheric properties. However, this bias is negligible for lower fractions of heterogeneities (<1%). Additionally, we find that acquiring a priori knowledge of stellar heterogeneities does not improve precision in constraining planetary parameters if the heterogeneities are appropriately marginalized within a retrieval; however, these are conditional on our confidence of stellar atmospheric models being accurate representations of the true photosphere. In sum, to acquire unbiased constraints when characterizing planetary atmospheres with the James Webb Space Telescope, we recommend performing joint retrievals of both the disk-integrated spectrum of the star and the stellar-contamination-corrected transmission spectrum.
DOI：
10.3847/1538-4357/aa96aa
发表时间：
2017-10
期刊：
The Astrophysical Journal
影响因子：
--
作者：
M. Veyette;P. Muirhead;A. Mann;J. Brewer;F. Allard;D. Homeier
通讯作者：
M. Veyette;P. Muirhead;A. Mann;J. Brewer;F. Allard;D. Homeier
影响因子：
6.5
作者：
S. Czesla;K. Huber;U. Wolter;S. Schröter;J. Schmitt
通讯作者：
S. Czesla;K. Huber;U. Wolter;S. Schröter;J. Schmitt
影响因子：
6.5
作者：
U. Wolter;J. H. M. M. Schmitt-J.-H.-M.-M.-Schmitt-2244209165;K. Huber;S. Czesla;Hans Muller;E. Guenther;A. Hatzes
通讯作者：
U. Wolter;J. H. M. M. Schmitt-J.-H.-M.-M.-Schmitt-2244209165;K. Huber;S. Czesla;Hans Muller;E. Guenther;A. Hatzes