On the potential of the EChO mission to characterize gas giant atmospheres
On the potential of the EChO mission to characterize gas giant atmospheres
复制标题
关于 EChO 任务描述气态巨行星大气特征的潜力
DOI：
10.1093/mnras/sts686
复制
发表时间：
2013
影响因子：
4.8
通讯作者：
Barstow J
中科院分区：
文献类型：
--
作者：
Barstow J
空间望远镜如系外行星特征观测台（EChO）和詹姆斯韦伯空间望远镜（JWST）将是未来研究系外行星大气的重要手段。这两项飞行任务都能够在可见光和红外线中以中等分辨率进行高灵敏度光谱测量，这将使人们能够利用一次和二次过境光谱来表征大气特性。我们使用非线性最优估计多变量光谱分析（NEMESIS）辐射传输和检索工具，由欧文等人开发。以及Lee等人，探索EChO任务的潜力，以解决一系列绕不同恒星运行的H2-He行星的检索问题。我们发现EChO应该能够反演温度结构到200 K的精度和检测H2O，CO2和CH 4从一个单一的日食测量的热木星围绕一个太阳类星星和一个热海王星围绕一个M星星，也提供了上限CO和NH3。我们提供了一个表格的检索精度为这些数量在每个测试用例。我们预计大约有30颗木星大小的行星可以被EChO观测到;围绕M矮星运行的热海王星更为罕见，但我们预计至少会观测到一颗类似的行星。
Space telescopes such asExoplanet Characterisation Observatory (EChO)andJames Webb Space Telescope (JWST)will be important for the future study of extrasolar planet atmospheres. Both of these missions are capable of performing high sensitivity spectroscopic measurements at moderate resolutions in the visible and infrared, which will allow the characterization of atmospheric properties using primary and secondary transit spectroscopy. We use the Non-linear optimal Estimator for MultivariateE spectral analysis (NEMESIS) radiative transfer and retrieval tool, as developed by Irwin et al. and Lee et al., to explore the potential of the proposedEChOmission to solve the retrieval problem for a range of H2–He planets orbiting different stars. We find thatEChOshould be capable of retrieving temperature structure to ∼200 K precision and detecting H2O, CO2and CH4from a single eclipse measurement for a hot Jupiter orbiting a Sun-like star and a hot Neptune orbiting an M star, also providing upper limits on CO and NH3. We provide a table of retrieval precisions for these quantities in each test case. We expect around 30 Jupiter-sized planets to be observable byEChO; hot Neptunes orbiting M dwarfs are rarer, but we anticipate observations of at least one similar planet.