Characterization of potentially habitable planets: Retrieval of atmospheric and planetary properties from emission spectra
Characterization of potentially habitable planets: Retrieval of atmospheric and planetary properties from emission spectra
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潜在宜居行星的表征：从发射光谱中检索大气和行星特性
DOI：
10.1051/0004-6361/201220009
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发表时间：
2013
影响因子：
6.5
通讯作者：
T. Trautmann
中科院分区：
文献类型：
--
作者：
P. V. Paris;P. V. Paris;P. Hedelt;P. Hedelt;F. Selsis;F. Schreier;T. Trautmann
上下文越来越多的潜在宜居类地行星和行星候选者被正在进行的行星搜索计划发现。寻找大气特征以确定行星的可居住性和生命的存在在未来可能是可能的。目标。我们希望量化可能从红外发射光谱法获得的检索大气参数（成分、温度、压力）的准确性。方法.我们使用对假设的潜在宜居行星的大气层的综合观测。这些模型是用参数化大气模型、高分辨率辐射传输模型和简化噪声模型建立的。模拟观测值用于拟合模型参数。此外，经典的统计工具，如χ 2统计和最小二乘拟合分析模拟观察。结果当采用目前计划或提议的系外行星表征任务的设计时，我们发现发射光谱可以对类地行星的表面条件提供弱限制，因此它们具有潜在的可居住性。然而，这些使命设计不太可能允许一个可居住的行星的大气层的组成特征，即使检测到二氧化碳。与目前的使命设计相比，将信噪比提高约2 - 5倍（取决于光谱分辨率）后，可将CO2含量定性为两个数量级以内。O3生物特征的检测仍然是边缘性的。大气温度结构不能被约束。因此，如果在二次日食或目标访问期间仅使用发射光谱学，则对大气层进行全面定性似乎超出了这类飞行任务的能力。可能还需要其他方法，如透射光谱学或轨道光度学，以提供额外的约束和打破简并。
Context. An increasing number of potentially habitable terrestrial planets and planet candidates are found by ongoing planet search programs. The search for atmospheric signatures to establish planetary habitability and the presence of life might be possible in the future. Aims. We want to quantify the accuracy of retrieved atmospheric parameters (composition, temperature, pressure) that might be obtained from infrared emission spectroscopy. Methods. We use synthetic observations of the atmospheres of hypothetical potentially habitable planets. These were constructed with a parametrized atmosphere model, a high-resolution radiative transfer model and a simplified noise model. The simulated observations were used to fit the model parameters. Furthermore, classic statistical tools such as χ 2 statistics and least-square fits were used to analyze the simulated observations. Results. When adopting the design of currently planned or proposed exoplanet characterization missions, we find that emission spectroscopy could provide weak limits on the surface conditions of terrestrial planets, hence their potential habitability. However, these mission designs are unlikely to allow the composition of the atmosphere of a habitable planet to be characterized, even though CO2 is detected. Upon increasing the signal-to-noise ratios by about a factor of 2−5 (depending on spectral resolution) compared to current mission designs, the CO2 content could be characterized to within two orders of magnitude. The detection of the O3 biosignature remains marginal. The atmospheric temperature structure could not be constrained. Therefore, a full atmospheric characterization seems to be beyond the capabilities of such missions when using only emission spectroscopy during secondary eclipse or target visits. Other methods such as transmission spectroscopy or orbital photometry are probably needed in order to give additional constraints and break degeneracies.
影响因子：
7.9
作者：
Anglada-Escude, Guillem;Arriagada, Pamela;Jenkins, James S.
通讯作者：
Jenkins, James S.