Student Dust Counter Status Report: The First 50 au
Student Dust Counter Status Report: The First 50 au
复制标题
DOI：
10.3847/psj/ac5ab7
复制
发表时间：
2022-03-01
期刊：
影响因子：
--
通讯作者：
Weaver, Harold
中科院分区：
文献类型：
--
作者：
Bernardoni, Edwin;Horanyi, Mihaly;Weaver, Harold
韦内蒂亚Burney Student尘埃计数器（SDC）是新视野号航天器上的一个现场尘埃探测器，用于测量质量m > 10（-12）g的颗粒的行星际尘埃粒子（IDP）分布。SDC提供了一个近乎连续的测量行星际尘埃环境，最近的结果跨越超过50 Au。这一覆盖范围包括埃奇奥尔-柯伊伯带（EKB），数值模型认为它是外太阳系IDP的主要来源。在这里，我们提出了更新的尘埃密度分布到50 Au和现有的理论模型比较估计通量值。SDC观测到尘埃通量和密度在42 Au附近达到峰值，我们预计随着日心距离的增加而衰减。基于SDC测量，我们还讨论了IDP的产生，运输和损失的EKB对象的表面的演变，其表面材料的不断混合，和一般的趋势，均匀化的光谱特性的影响。持续的SDC测量对于揭示EKB的大尺度结构和指导其他恒星周围尘埃盘的解释仍然至关重要。此外，我们认为潜在的星际尘埃（ISD）和“外”柯伊伯带贡献的SDC测量和预期的SDC通量值超过50 Au的影响，我们表明，包括任何来源的预测模型的结果在预期的SDC测量超过50 Au的一个明显的偏差。目前和未来的SDC测量也有助于限制ISD对SDC通量和密度估计的相对贡献。
The Venetia Burney Student Dust Counter (SDC) is an in situ dust detector on board the New Horizons spacecraft measuring the interplanetary dust particle (IDP) distribution for grains with mass m > 10(-12) g. SDC provides a near-continuous measure of the interplanetary dust environment, with recent results spanning beyond 50 au. This coverage includes the Edgeworth-Kuiper Belt (EKB), suggested by numerical models to be the dominant source of IDP in the outer solar system. Here we present the updated dust density distribution to 50 au and compare estimated flux values to existing theoretical models. SDC observes peak dust flux and densities near 42 au, and we expect a decay with increasing heliocentric distance. Based on SDC measurements, we also discuss the effects of IDP generation, transport, and loss on the evolution of the surfaces of EKB objects, the continual intermixing of their surface material, and the general tendency to homogenize their spectral properties. Continued SDC measurements remain critical for revealing the large-scale structure of the EKB and to guide the interpretation of dust disks around other stars. Additionally, we consider the potential of an interstellar dust (ISD) and "outer" Kuiper Belt contribution to SDC measurements and its effect on anticipated SDC flux values beyond 50 au, and we show that the inclusion of either source to the predicted model results in a noticeable deviation in anticipated SDC measurements beyond 50 au. Current and future SDC measurements also serve to constrain the relative contribution of ISD to SDC's flux and density estimates.