Retrieval of the d/sdL7+T7.5p Binary SDSS J1416+1348AB
Retrieval of the d/sdL7+T7.5p Binary SDSS J1416+1348AB
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DOI：
10.3847/1538-4357/abbee2
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发表时间：
2020-12
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影响因子：
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通讯作者：
Eileen C. Gonzales;B. Burningham;J. Faherty;Colleen M. Cleary;C. Visscher;M. Marley;R. Lupu;R. Fr
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文献类型：
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作者：
Eileen C. Gonzales;B. Burningham;J. Faherty;Colleen M. Cleary;C. Visscher;M. Marley;R. Lupu;R. Fr
给出了d/sdL7 SDSS J14162408+1348263A(J1416A)的距离定标光谱能量分布(SED)和更新后的距离定标光谱能量分布J14162408+1348263B(J1416B)。利用Brewster检索码库对J1416A进行了第一次检索分析，对J1416B进行了第二次检索分析。我们发现，非灰色云的不透明度与波长呈幂函数关系，但不能区分云参数化的类型，这对初级云最合适。J1416B最适合无云模型，这与Line等人的结果一致。对于J1416A和J1416B，通过SED和检索得到的大多数基本参数在1σ内一致。例外包括J1416A的半径，其中对于甲板云模式，其反演的半径小于基于进化模型的半径，以及测辐射光度，对于两个云模式，其在2.5σ范围内一致。该对的金属丰度和碳氧比指向作为一个系统的形成和演化。通过比较两个不透明度模型的反演碱丰度，我们能够评估L矮星和T矮星的不透明度表现。最后，我们发现，相对较小的组成变化可以驱动较低温度物体的主要可观测差异。
We present the distance-calibrated spectral energy distribution (SED) of the d/sdL7 SDSS J14162408+1348263A (J1416A) and an updated SED for SDSS J14162408+1348263B (J1416B). We also present the first retrieval analysis of J1416A using the Brewster retrieval code base and the second retrieval of J1416B. We find that the primary is best fit by a nongray cloud opacity with a power-law wavelength dependence but is indistinguishable between the type of cloud parameterization. J1416B is best fit by a cloud-free model, consistent with the results from Line et al. Most fundamental parameters derived via SEDs and retrievals are consistent within 1σ for both J1416A and J1416B. The exceptions include the radius of J1416A, where the retrieved radius is smaller than the evolutionary model-based radius from the SED for the deck cloud model, and the bolometric luminosity, which is consistent within 2.5σ for both cloud models. The pair’s metallicity and carbon-to-oxygen ratio point toward formation and evolution as a system. By comparing the retrieved alkali abundances while using two opacity models, we are able to evaluate how the opacities behave for the L and T dwarf. Lastly, we find that relatively small changes in composition can drive major observable differences for lower-temperature objects.