论文标题
高对比度热红外光谱与ALE：3-4 $ $ M $ m频谱$κ$ Andromedae b
High Contrast Thermal Infrared Spectroscopy with ALES: The 3-4$μ$m Spectrum of $κ$ Andromedae b
论文作者
论文摘要
我们介绍了$κ$ 〜Andromedae〜B的第一个$ l- $ band（2.8至4.1〜 $ $ m），一个$ \ sim20〜m _ {\ mathrm {jup}} $ companion $ 1^{\ prime \ prime \ prime} $ projected $ projected oft of the b9- typepe stellar typepe stellar typepe stellar typepe stellar typlear。我们将大型双目望远镜啤酒积分磁场数据与其他工具的测量结合在一起，以分析$κ$〜和〜b的大气和物理特征。我们报告了$ l^{\ prime} $ flux $ \ sim20 \％$（$2σ$）的差异，与先前发表的值进行比较时，$κ$〜和〜b的差异。我们使用LBTI/LMIRCAM在2013年收集的未发表的成像数据集添加了额外的$ l^{\ prime} $约束，这是构建ALES模块的仪器。 LMIRCAM的测量与ALES的测量一致，这都表明比以前的研究表明$ L $ band缩放量。假设通过ALES和LMIRCAM成像测量的通量缩放，该数据非常适合L3型棕色矮人。大气模型适合跨越0.9-4.8〜 $ $ m m的测量结果，这表明了进化模型的预测，但是正确选择云参数可以提供一些缓解。特别是，云延伸至由谷物$ \ leq1〜μ $ m组成的非常低压的模型似乎是必要的。如果更明亮的$ l^{\ prime} $光度法是准确的，则有一个暗示可能需要亚极金属度。
We present the first $L-$band (2.8 to 4.1~$μ$m) spectroscopy of $κ$~Andromedae~b, a $\sim20~M_{\mathrm{Jup}}$ companion orbiting at $1^{\prime\prime}$ projected separation from its B9-type stellar host. We combine our Large Binocular Telescope ALES integral field spectrograph data with measurements from other instruments to analyze the atmosphere and physical characteristics of $κ$~And~b. We report a discrepancy of $\sim20\%$ ($2σ$) in the $L^{\prime}$ flux of $κ$~And~b when comparing to previously published values. We add an additional $L^{\prime}$ constraint using an unpublished imaging dataset collected in 2013 using LBTI/LMIRCam, the instrument in which the ALES module has been built. The LMIRCam measurement is consistent with the ALES measurement, both suggesting a fainter $L$-band scaling than previous studies. The data, assuming the flux scaling measured by ALES and LMIRCam imaging, are well fit by an L3-type brown dwarf. Atmospheric model fits to measurements spanning 0.9-4.8~$μ$m reveal some tension with the predictions of evolutionary models, but the proper choice of cloud parameters can provide some relief. In particular, models with clouds extending to very-low pressures composed of grains $\leq1~μ$m appear to be necessary. If the brighter $L^{\prime}$ photometry is accurate, there is a hint that sub-solar metallicity may be required.
