HD 32297碎片盘的CARMA毫米波孔径合成成像
CARMA Millimeter-Wave Aperture Synthesis Imaging of the HD 32297 Debris Disk
摘要：
我们提出的第一个检测和映射的HD 32297碎片盘在1.3毫米的毫米波天文学研究组合阵列（CARMA）。使用亚弧秒光束，这一探测是迄今为止对碎片盘观测的最高角分辨率（亚）毫米。我们的模型适合的光谱能量分布的CARMA通量和新的斯皮策MIPS测光支持较早的建议，至少有两个，可能是三个，不同的粮食人口跟踪目前的数据。观测到的毫米图显示了东北和西南盘叶之间的不对称性，这表明大颗粒可能与一颗看不见的系外行星共振。或者，观察到的形态可能是最近一个大质量微行星分裂的结果。在散射光中也观察到类似尺度的不对称性，但在中红外线中没有。短波长和长波长的不对称性与中波长的对称性之间的这种对比在质量上与共振碎片盘模型的预测相一致。HD 32297在波长跨越三十年的几个波段进行了解析观测，为颗粒和行星动力学理论提供了一个独特的测试平台，并可能为系外行星系统提供强有力的多波长证据。
英文摘要：
We present the first detection and mapping of the HD 32297 debris disk at 1.3 mm with the Combined Array for Research in Millimeter-wave Astronomy (CARMA). With a sub-arcsecond beam, this detection represents the highest angular resolution (sub)mm debris disk observation made to date. Our model fits to the spectral energy distribution from the CARMA flux and new Spitzer MIPS photometry support the earlier suggestion that at least two, possibly three, distinct grain populations are traced by the current data. The observed millimeter map shows an asymmetry between the northeast and southwest disk lobes, suggesting large grains may be trapped in resonance with an unseen exoplanet. Alternatively, the observed morphology could result from the recent breakup of a massive planetesimal. A similar-scale asymmetry is also observed in scattered light but not in the mid-infrared. This contrast between asymmetry at short and long wavelengths and symmetry at intermediate wavelengths is in qualitative agreement with predictions of resonant debris disk models. With resolved observations in several bands spanning over three decades in wavelength, HD 32297 provides a unique testbed for theories of grain and planetary dynamics, and could potentially provide strong multi-wavelength evidence for an exoplanetary system.
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