经典新星EVLA天鹰座的观测
EVLA Nova Project Observations of the Classical Nova V1723 Aquilae
摘要：
本文介绍了用扩展甚大阵（EVLA）观测到的经典新星V1723 Aql的射电光变曲线和光谱。这是第一篇展示EVLA新星项目结果的论文，该项目由一组观察员和理论家组成，利用EVLA射电观测的极大增强的灵敏度和频率覆盖范围，以及其他波长的观测，以更深入地了解新星爆炸的能量学，形态学和时间特征。我们对V1723 Aql的观测频率跨度为1-37 GHz，我们报告了新星爆炸后14-175天的数据。广泛的频率覆盖和频繁的监测表明，V1723 Aql的无线电行为并不遵循经典的同源球形膨胀热喷出物的哈勃流模型。光谱总是至少部分光学薄，通量上升的时间尺度比线性膨胀可以再现的更快。因此，对潜在物理过程的任何描述都必须超越这一简单的图景。这种不寻常的光谱特性和光变曲线的演变可能是由多个发射区或受冲击的材料引起的。事实上，Swift的X射线观测显示，冲击可能存在。
英文摘要：
We present radio light curves and spectra of the classical nova V1723 Aql obtained with the Expanded Very Large Array (EVLA). This is the first paper to showcase results from the EVLA Nova Project, which comprises a team of observers and theorists utilizing the greatly enhanced sensitivity and frequency coverage of EVLA radio observations, along with observations at other wavelengths, to reach a deeper understanding of the energetics, morphology, and temporal characteristics of nova explosions. Our observations of V1723 Aql span 1-37 GHz in frequency, and we report on data from 14-175 days following the time of the nova explosion. The broad frequency coverage and frequent monitoring show that the radio behavior of V1723 Aql does not follow the classic Hubble-flow model of homologous spherically expanding thermal ejecta. The spectra are always at least partially optically thin, and the flux rises on faster timescales than can be reproduced with linear expansion. Therefore, any description of the underlying physical processes must go beyond this simple picture. The unusual spectral properties and light curve evolution might be explained by multiple emitting regions or shocked material. Indeed, X-ray observations from Swift reveal that shocks are likely present.
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