Title: The Aromatic Infrared Bands around the Wolf-Rayet Binary WR140 Revealed by JWST Show Chinese title

Title: 围绕沃尔夫-拉叶双星WR140的芳香红外线带由JWST揭示

Abstract: We have analyzed the aromatic infrared bands (AIBs) in the 6-11.2 $\mu$m range around the Wolf-Rayet binary WR140 (d=1.64 kpc) obtained with the James Webb Space Telescope (JWST) Mid-Infrared Instrument (MIRI) Medium-Resolution Spectrometer (MRS). In WR140's circumstellar environment, we have detected AIBs at 6 $\mu$m and 7.7 $\mu$m which are attributed to C-C stretching modes. These features have been detected in the innermost dust shell (Shell1; ~2100 au from WR140), the subsequent dust shell (Shell2; ~5200 au), and ``off-shell'' regions in the MRS coverage. The 11.2 $\mu$m AIB, which is associated with the C-H out-of-plane bending mode, has been tentatively detected in Shell2 and the surrounding off-shell positions around Shell2. We compared the AIB features from WR140 to spectra of established AIB feature classes A, B, C, and D. The detected features around WR140 do not agree with these established classes. The peak wavelengths and full width half maxima (FWHMs) of the 6 $\mu$m and 7.7 $\mu$m features are, however, consistent with those of R Coronae Borealis (RCB) stars with hydrogen-poor conditions. We discuss a possible structure of carbonaceous compounds and environments where they form around WR140. It is proposed that hydrogen-poor carbonaceous compounds initially originate from the carbon-rich WR wind, and the hydrogen-rich stellar wind from the companion O star may provide hydrogen to these carbonaceous compounds. Show Chinese abstract

Abstract: 我们分析了在沃尔夫-拉叶双星WR140（距离=1.64 kpc）周围6-11.2$\mu$m范围内获得的芳香红外线（AIBs），这些数据来自詹姆斯·韦布空间望远镜（JWST）中红外仪器（MIRI）中分辨率光谱仪（MRS）。 在WR140的原恒星环境中，我们在6$\mu$m和7.7$\mu$m处检测到AIBs，这些特征归因于C-C伸缩模式。 这些特征已在最内层尘埃壳层（Shell1；距离WR140约2100 au）、后续尘埃壳层（Shell2；约5200 au）以及MRS覆盖范围内的“非壳层”区域中被检测到。 11.2$\mu$m的AIB与C-H面外弯曲模式有关，在Shell2及其周围的非壳层位置上已初步检测到该特征。 我们将WR140的AIB特征与已确立的AIB特征类别A、B、C和D的光谱进行了比较。在WR140周围检测到的特征与这些已确立的类别不一致。 然而，6$\mu$m和7.7$\mu$m特征的峰值波长和半高全宽（FWHMs）与氢贫条件下的R Coronae Borealis（RCB）恒星一致。 我们讨论了WR140周围碳化合物的可能结构以及它们形成环境。 提出氢贫的碳化合物最初来源于富含碳的WR风，伴星O型星的富氢恒星风可能为这些碳化合物提供氢。