Classical Novae at Radio Wavelengths
Classical Novae at Radio Wavelengths
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DOI：
10.3847/1538-4365/ac24ab
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发表时间：
2021-07
期刊：
影响因子：
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通讯作者：
L. Chomiuk;J. Linford;E. Aydi;K. Bannister;M. Krauss;A. Mioduszewski;K. Mukai;T. Nelson;M. Rupen;S. Ryder;J. Sokoloski;K. Sokolovsky;J. Strader;M. Filipović;T. Finzell;A. Kawash;E. Kool;B. Metzger;M. Nyamai;V. Ribeiro;N. Roy;R. Urquhart;J. Weston
中科院分区：
文献类型：
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作者：
L. Chomiuk;J. Linford;E. Aydi;K. Bannister;M. Krauss;A. Mioduszewski;K. Mukai;T. Nelson;M. Rupen;S. Ryder;J. Sokoloski;K. Sokolovsky;J. Strader;M. Filipović;T. Finzell;A. Kawash;E. Kool;B. Metzger;M. Nyamai;V. Ribeiro;N. Roy;R. Urquhart;J. Weston
我们展示了36颗经典新星的射电观测（1-40 GHz），这些数据来自50多年来的文献、望远镜档案和我们自己的项目。我们的目标在其光学参数中显示出惊人的多样性（例如，跨越光学衰落时间尺度，t 2 = 1-263天），我们在射电光曲线中发现了类似的多样性。通过亮度温度分析，我们发现新星的射电辐射是热辐射和同步辐射的混合，在较早的时候观测到非热辐射。我们确定了高亮度温度发射（tb bbb50 × 104 K）作为至少9颗（25%）新星同步辐射的指示。我们发现了一类以同步辐射为主、伴星进化较慢的新星，如V5589 Sgr和V392 Per，它们似乎是具有矮伴星的经典新星和具有巨大伴星的共生双星之间的桥梁。我们样本中的四个新星有两个明显的射电最大值（第一个由同步加速器主导，第二个由热辐射主导），并且在四个案例中，早期同步加速器峰值与光学光曲线的急剧下降在时间上是一致的，暗示在粒子加速和尘埃形成的共同位置。我们以机器可读的表格形式发布光曲线，并鼓励更广泛的社区在多波长研究和建模工作中使用这些数据。
We present radio observations (1–40 GHz) for 36 classical novae, representing data from over five decades compiled from the literature, telescope archives, and our own programs. Our targets display a striking diversity in their optical parameters (e.g., spanning optical fading timescales, t 2 = 1–263 days), and we find a similar diversity in the radio light curves. Using a brightness temperature analysis, we find that radio emission from novae is a mixture of thermal and synchrotron emission, with nonthermal emission observed at earlier times. We identify high brightness temperature emission (T B > 5 × 104 K) as an indication of synchrotron emission in at least nine (25%) of the novae. We find a class of synchrotron-dominated novae with mildly evolved companions, exemplified by V5589 Sgr and V392 Per, that appear to be a bridge between classical novae with dwarf companions and symbiotic binaries with giant companions. Four of the novae in our sample have two distinct radio maxima (the first dominated by synchrotron and the later by thermal emission), and in four cases the early synchrotron peak is temporally coincident with a dramatic dip in the optical light curve, hinting at a common site for particle acceleration and dust formation. We publish the light curves in a machine-readable table and encourage the use of these data by the broader community in multiwavelength studies and modeling efforts.