发表机构
American Museum of Natural History; Graduate Center, City University of New York; Hunter College, City University of New York; Backyard Worlds: Planet 9; University of Hertfordshire; University of Utah; Amherst College; San Francisco State University（美国自然历史博物馆; 纽约市立大学研究生中心; 纽约市立大学亨特学院; 后院世界：第九颗行星; 赫特福德大学; 犹他大学; 阿默斯特学院; 旧金山州立大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用JWST完整表征L/T过渡褐矮星CW2106，推导其基本参数，发现近红外需多云模型而中红外需无云模型，预测云层以顽火辉石为主并移除约23%的体氧。
AI 中文摘要
在本研究中，我们利用詹姆斯·韦布空间望远镜（JWST）展示了L/T过渡天体CWISE J210640.16+250729.0（CW2106）的完整（97.3%完备）0.8–12.5微米光谱能量分布（SED）。我们提供了主星元素丰度和年龄的全面表征。我们经验性地推导了CW2106的辐射光度（L_bol≈-4.825太阳光度），并获得了其质量（M≈50–62木星质量）、半径（R≈0.83–0.87木星半径）、有效温度（T_eff≈1213 K）和表面重力（log g≈5.28 dex）的估计值。我们发现近红外（near-IR）光谱（0.8–2.5微米）最适合用多云大气模型再现，而中红外（mid-IR）光谱（5–12.5微米）最适合用无云模型再现。这表明云层仅限于大气最深层可观测部分，并通过缺乏9微米硅酸盐特征得到证实。利用主星的Mg/Si比以及热化学模型，我们预测CW2106中的云主要由顽火辉石（MgSiO3）组成，从大气中移除了约23%的体氧。未来的反演研究将有助于探究这些云物种的存在及其全部影响。
英文摘要
In this study, we present the full (97.3\% complete) 0.8--12.5 $μ$m spectral energy distribution (SED) of an L/T transition object, CWISE J210640.16+250729.0 (CW2106), using the James Webb Space Telescope (JWST). We provide a full characterization of the host star's elemental abundances and age. We empirically derive the bolometric luminosity ($L_{\rm bol}\approx-4.825$ $\textup{L}_\odot$) of CW2106, and obtain estimates of its mass (M$\approx50-62$ M$_{\rm Jup}$), radius (R$\approx0.83-0.87$ R$_{\rm Jup}$), effective temperature ($T_{\rm eff}$$\approx1213$ K), and surface gravity ($\log~g$$\approx5.28$ dex). We find the near-infrared (near-IR) spectrum ($0.8-2.5 ~μ$m) is best reproduced with cloudy atmospheric models while the mid-infrared (mid-IR) spectrum ($5-12.5 ~μ$m) is best reproduced with cloudless models. This suggests a cloud layer restricted to only the deepest observable parts of the atmosphere and is qualified by the lack of a 9 $μ$m silicate feature. Making use of the Mg/Si ratio of the primary, alongside thermochemical models, we predict the clouds in CW2106 to be composed primarily of enstatite (MgSiO$_3$), removing $\sim23\%$ of the bulk oxygen out of the atmosphere. Future retrieval studies will be able to help investigate the existence and full impact of these cloud species.
Comments30 pages, 12 Figures, 4 Tables. Accepted for publication in ApJ
