Constraining the Solar System's Debris Disk with In Situ New Horizons Measurements from the Edgeworth–Kuiper Belt
Constraining the Solar System's Debris Disk with In Situ New Horizons Measurements from the Edgeworth–Kuiper Belt
复制标题
利用埃奇沃斯-柯伊伯带的原位新视野号测量来约束太阳系的碎片盘
DOI：
10.3847/2041-8213/ab322a
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
S. Stern
中科院分区：
文献类型：
--
作者：
A. Poppe;C. Lisse;M. Piquette;M. Zemcov;M. Horányi;D. James;J. Szalay;E. Bernardoni;S. Stern
太阳系目前拥有两个行星形成时期遗留下来的碎片盘，即小行星带和埃奇奥-柯伊伯带（EKB）。与其他恒星系统类似，这些碎片盘通过相互碰撞、星际尘埃颗粒轰击和较大颗粒的升华/溅射等过程不断产生亚毫米大小的尘埃颗粒。在这里，我们使用新视野号学生尘埃计数器和行星际尘埃动力学模型最近的原位测量来约束太阳系碎片盘的整体结构和大小，包括盘质量，光学深度和表面亮度散射光和热发射。我们发现太阳系尘埃盘质量（直径<1 mm的颗粒）的约99%包含在30 Au以外的EKB和奥尔特云彗星颗粒中，其余约1%的质量以5 Au以内的彗星族尘埃形式存在。总的盘质量估计为1.88 × 10−7 M，总的光度分数为1.55 × 10−7，证实了我们的太阳系与类似年龄的FGK恒星周围的碎片盘相比，是一个相对缺乏尘埃的系统。最后，我们估计，柯伊伯带天体碰撞事件，如创造妊神星家族的事件，可能会暂时增加我们的碎片盘目前的表面亮度的一个因素，只有10.6，远远低于在其他附近的磁盘中看到的亮度中值。这进一步支持了EKB相对于其他恒星系统的原始质量已经被行星迁移引发的不稳定性大大耗尽的观点。
The solar system currently possesses two remnant debris disks leftover from the planetary formation era in the form of the asteroid belt and the Edgeworth–Kuiper Belt (EKB). Similar to other stellar systems, these debris disks continually generate submillimeter-sized dust grains through processes such as mutual collisions, interstellar dust grain bombardment, and sublimation/sputtering of larger grains. Here, we use recent in situ measurements by the New Horizons Student Dust Counter and an interplanetary dust dynamics model to constrain the overall structure and magnitude of the solar system’s debris disk, including the disk mass, optical depth, and surface brightness in both scattered light and thermal emission. We find that ∼99% of the solar system’s dust disk mass (grains with diameter <1 mm) is contained within EKB and Oort Cloud cometary grains outside of 30 au, with the remaining ∼1% mass in the form of Jupiter-family cometary dust within 5 au. The total disk mass is estimated to be ∼8 × 10−7 M⊕ with a total fractional luminosity of ∼5 × 10−7, confirming our solar system as a relatively dust-poor system compared to debris disks around similar-aged FGK stars. Finally, we estimate that Kuiper Belt Object collisional events such as that which created the Haumea family could transiently increase the current surface brightness of our debris disk by a factor of only ∼6, far less than median brightnesses seen in other nearby disks. This further supports the idea that the EKB has been largely depleted of its primordial mass relative to other stellar systems by instabilities triggered by planetary migration.
埃奇沃斯-柯伊伯碎片盘的改进模型
影响因子：
6.5
作者：
Ch. Vitense;A.V. Krivov;H. Kobayashi;T. Löhne
通讯作者：
T. Löhne