APOCENTER GLOW IN ECCENTRIC DEBRIS DISKS: IMPLICATIONS FOR FOMALHAUT AND ϵ ERIDANI
APOCENTER GLOW IN ECCENTRIC DEBRIS DISKS: IMPLICATIONS FOR FOMALHAUT AND ϵ ERIDANI
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偏心碎片盘中的远心点发光：对北落师门和波江座 ϵ 的影响
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
M. Kuchner
中科院分区：
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作者：
M. Pan;E. Nesvold;M. Kuchner
碎片盘通常采取偏心环的形式，表面亮度具有方位不对称性。这样的圆盘通常被描述为显示“近心辉光”，在最接近中心星星的区域中圆盘亮度的增强。然而，在长波长下，盘的远心应该比近心亮：在长波长极限下，我们发现远心/近心通量比与盘的偏心率e成比例。我们产生了这种“远心辉光”的新模型，以探索其原因和波长依赖性，并研究其作为尘埃颗粒特性探针的潜力。基于我们的模型，我们认为，几个远红外和（亚）毫米图像的北落师门和波江座碎片环与赫歇尔，JCMT，SHARC II，阿尔马，和ATCA应重新解释为建议或远心辉光的例子。这种重新解释产生了新的限制磁盘的尘埃颗粒的属性和大小分布。
Debris disks often take the form of eccentric rings with azimuthal asymmetries in surface brightness. Such disks are often described as showing “pericenter glow,” an enhancement of the disk brightness in regions nearest the central star. At long wavelengths, however, the disk apocenters should appear brighter than their pericenters: in the long-wavelength limit, we find that the apocenter/pericenter flux ratio scales as for disk eccentricity e. We produce new models of this “apocenter glow” to explore its causes and wavelength dependence and study its potential as a probe of dust grain properties. Based on our models, we argue that several far-infrared and (sub)millimeter images of the Fomalhaut and ϵ Eridani debris rings obtained with Herschel, JCMT, SHARC II, ALMA, and ATCA should be reinterpreted as suggestions or examples of apocenter glow. This reinterpretation yields new constraints on the disks’ dust grain properties and size distributions.