围绕 FU Ori 型天体 V1057 Cyg 的复杂有机物指示升华冰物质
Complex Organics Surrounding the FU Ori-Type Object V1057 Cyg Indicative of Sublimated Ices
AI总结：
利用 NOEMA 观测五个近百年内爆发的 YSO，发现 V1057 Cyg 谱线丰富并含复杂有机物与水，可作为 V883 Ori 的北天对应体。
摘要：
FU Ori 型和 EX Lup 型天体为理解恒星与行星形成过程中的一个关键阶段提供了天然实验。由于吸积和中心光度的突然增加导致星盘及周围物质温度升高，这些天体使我们能够深入了解形成中的行星系统可获得的分子多样性。这使得挥发物能够从颗粒上升华，并在首次爆发后以气相存在数十至数百年。虽然这一动态阶段在类太阳原恒星中可能很常见，但对这些爆发的化学影响进行观测却很少。在本文中，我们展示了利用北方扩展毫米波阵列（NOEMA）对过去100年内经历过爆发的五个年轻恒星天体（YSO）的观测结果，并编录了在 YSO 周围约1000 au 范围内发现的挥发物化学组成。只有一个源清晰地显示出谱线丰富的光谱，检测到超过11种分子，包括复杂有机物和水，这正是爆发后源预期的光谱特征。该源即 V1057 Cyg，我们将其作为研究充分且分子丰富的 FU Ori 源 V883 Ori 的北半球对应天体。我们对样本中其他四个源化学清单的结论受到灵敏度限制，因为 V1057 Cyg 具有最高的星盘/包层气体质量。
英文摘要：
FU Ori and EX Lup type objects present natural experiments for understanding a critical stage in the star and planet formation process. These objects offer insight into the diversity of molecules available to forming planetary systems due to a sudden increase in accretion and central luminosity causes the disk and surrounding material to increase in temperature. This allows for volatiles to sublimate off of grains and exist in the gas-phase for tens to hundreds of years post initial outburst. While this dynamic stage may be common for solar-type protostars, observations of the chemical impact of these bursts are rare. In this article, we present observations from the NOrthern Extended Millimeter Array (NOEMA) of five Young Stellar Objects (YSOs) that have undergone outbursts within the past 100 years and catalog the volatile chemistry found within approx 1000 au of the YSO. Only one source clearly shows a line rich spectra with >11 molecules detected including complex organics and water, as is an expected spectra signature for a post-outburst source. This source is V1057 Cyg, and we present it as the northern analog to the well studied and molecule-rich FU Ori source, V883 Ori. Our conclusions on the chemical inventory of the other four sources in our sample are sensitivity limited, as V1057 Cyg contains the highest disk/envelope gas mass.
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