论文标题
与JWST观察到的狼射线二进制WR 140周围的嵌套灰尘壳
Nested Dust Shells around the Wolf-Rayet Binary WR 140 observed with JWST
论文作者
论文摘要
拥有狼射线（WR）恒星的巨大碰撞二进制物在星际培养基（ISM）中提出了潜在的灰尘和化学富集的潜在重要来源。但是，从这种系统形成的尘埃的化学组成和存活尚不清楚。富含碳的WR（WC）二进制WR〜140提出了一个理想的天体物理实验室，用于研究这些问题，鉴于其定义明确的轨道时期和可预测的粉尘形成发作，每7.93年围绕Periastron通过。我们介绍了我们的早期发行科学计划（ERS1349）的观察结果，其中包括James Webb太空望远镜（JWST）中红外仪器（MIRI）中分辨率光谱仪（MRS）和成像仪，揭示了围绕WR〜140周围嵌套的间隔灰尘壳的光谱和空间特征。在过去的$ \ gtrsim130 $ $年中，第二个尘埃壳和成像仪检测的MIRI MRS光谱法证实了WR〜140的碳质粉尘晶粒的生存，这些碳质粉尘晶粒可能是“未识别的红外”（UIR） - 频带特征6.4和7.7 $ m $ m $ m $ $ $ m $ $。观察结果表明，粉尘的WC二进制文件可以用有机化合物和碳质粉尘丰富ISM。
Massive colliding-wind binaries that host a Wolf-Rayet (WR) star present a potentially important source of dust and chemical enrichment in the interstellar medium (ISM). However, the chemical composition and survival of dust formed from such systems is not well understood. The carbon-rich WR (WC) binary WR~140 presents an ideal astrophysical laboratory for investigating these questions given its well-defined orbital period and predictable dust-formation episodes every 7.93 years around periastron passage. We present observations from our Early Release Science program (ERS1349) with the James Webb Space Telescope (JWST) Mid-Infrared Instrument (MIRI) Medium-Resolution Spectrometer (MRS) and Imager that reveal the spectral and spatial signatures of nested circumstellar dust shells around WR~140. MIRI MRS spectroscopy of the second dust shell and Imager detections of over 17 shells formed throughout the past $\gtrsim130$ years confirm the survival of carbonaceous dust grains from WR~140 that are likely carriers of "unidentified infrared" (UIR)-band features at 6.4 and 7.7 $μ$m. The observations indicate that dust-forming WC binaries can enrich the ISM with organic compounds and carbonaceous dust.
