论文标题
棕色矮葡萄酒的大气检索229b
An Atmospheric Retrieval of the Brown Dwarf Gliese 229B
论文作者
论文摘要
我们使用BREWSTER检索代码对GL 229B进行大气检索分析提供了结果。我们发现最佳拟合模型是无云的，与Line等人的T矮人检索工作一致。 2017年，Zalesky等。 2022和Gonzales等。 2020。基本参数（质量，半径，log（l_ {bol}/l_ {sun}），从我们的模型确定的log（g））在1σtosed得分的值中同意，除了我们检索到的t_ {eff}的t_ {eff}比进化模型的SED值大约100 k。我们发现检索到的质量为50^{+12} _ { - 9} m_ {jup}，但是，我们还发现，GL 229b的可观察到的可观察到的无云模型可以解释，该模型具有质量为Dynamilal值的先验质量，即70 M_ {JUP}。我们能够约束H_2O，CO，CH_4，NH_3，Na和K的丰度，并与其主要的GL 229A相比，找到超级C/O比。我们报告了由于大气中的氧耗竭而导致的总体生产金属性，但找到了与主要的太阳能[C/H]相匹配的太阳能[C/H]。我们发现，这项工作有助于基于检索的研究的增长趋势，尤其是对于棕色矮人，朝上极c/o比率，并讨论了这种结果对形成机制，内部物理过程和模型偏见的影响。
We present results from an atmospheric retrieval analysis of Gl 229B using the BREWSTER retrieval code. We find the best fit model to be cloud-free, consistent with the T dwarf retrieval work of Line et al. 2017, Zalesky et al. 2022 and Gonzales et al. 2020. Fundamental parameters (mass, radius, log(L_{Bol}/L_{Sun}), log(g)) determined from our model agree within 1σto SED-derived values except for T_{eff} where our retrieved T_{eff} is approximately 100 K cooler than the evolutionary model-based SED value. We find a retrieved mass of 50^{+12}_{-9} M_{Jup}, however, we also find that the observables of Gl 229B can be explained by a cloud-free model with a prior on mass at the dynamical value, 70 M_{Jup}. We are able to constrain abundances for H_2O, CO, CH_4, NH_3, Na and K and find a supersolar C/O ratio as compared to its primary, Gl 229A. We report an overall subsolar metallicity due to atmospheric oxygen depletion but find a solar [C/H], which matches that of the primary. We find that this work contributes to a growing trend in retrieval-based studies, particularly for brown dwarfs, toward supersolar C/O ratios and discuss the implications of this result on formation mechanisms, internal physical processes as well as model biases.
