论文标题
Alma和VLA在其静止状态下观察到Ex Lupi
ALMA and VLA Observations of EX Lupi in its Quiescent State
论文作者
论文摘要
年轻恒星中的极端爆发可能是序列前恒星进化的常见阶段。这些爆发是由增强积聚引起的，并伴随着亮度的增加，也会强烈影响折变环境的演变。我们提出了Alma和VLA的观察结果，该观察结果是100 GHz，45 GHz和15 GHz的原型爆发系统的Ex Lupi。我们使用这些数据以及档案ALMA 232 GHz数据，将辐射转移模型拟合到2008年极端爆发后的静态磁盘中，将辐射转移模型符合其静态状态。最佳拟合模型显示了一个紧凑的磁盘，具有45 au的特征性除尘，总质量为45 au，总质量为0.01 m $ _ $ _ {\ odot} $。我们的建模表明，磁盘中的谷物生长至少为3毫米，可能受到最近爆发的刺激，并且冰线已向内迁移至0.2-0.3 $ au的后爆发。在15 GHz时，我们检测到预期的热盘发射的显着发射，我们主要将其归因于Stellar（Gyro）同步加速器和免费磁盘发射。总的来说，这些结果突出了爆发对情节灰尘的常见影响。
Extreme outbursts in young stars may be a common stage of pre-main-sequence stellar evolution. These outbursts, caused by enhanced accretion and accompanied by increased luminosity, can also strongly impact the evolution of the circumstellar environment. We present ALMA and VLA observations of EX Lupi, a prototypical outburst system, at 100 GHz, 45 GHz, and 15 GHz. We use these data, along with archival ALMA 232 GHz data, to fit radiative transfer models to EX Lupi's circumstellar disk in its quiescent state following the extreme outburst in 2008. The best fit models show a compact disk with a characteristic dust radius of 45 au and a total mass of 0.01 M$_{\odot}$. Our modeling suggests grain growth to sizes of at least 3 mm in the disk, possibly spurred by the recent outburst, and an ice line that has migrated inward to $0.2-0.3$ au post-outburst. At 15 GHz, we detected significant emission over the expected thermal disk emission which we attribute primarily to stellar (gyro)synchrotron and free-free disk emission. Altogether, these results highlight what may be a common impact of outbursts on the circumstellar dust.
