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arXiv 1708.07151astro-ph.EP
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什么设定了热碎片的径向位置?

What Sets the Radial Locations of Warm Debris Disks?

Nicholas P. Ballering, George H. Rieke, Kate Y. L. Su, András Gáspár

摘要:

碎片盘的结构编码了这些系统中行星形成的历史。通过碎片盘的光谱能量分布(SED)对碎片盘进行的研究发现,红外线过量来自冷尘埃、暖尘埃或两者的组合。许多系统的冷外围带已经被成像,这有助于对它们进行非常详细的研究。关于温暖的成分,包括尘埃的起源,我们知道的要少得多。圆盘温度的规律性表明可能与水雪线有关的潜在结构。如果这些尘埃是由一个系外小行星带中的碰撞产生的,那么这些尘埃将很可能追踪到原始原行星盘中的水雪线的位置,在那里星子的生长得到了加强。相反,如果温暖的尘埃来自系统中更远的冰物质库的向内输送,那么尘埃的位置预计将由当前的雪线确定。我们分析了一个大样本的碎片盘温暖的组件的SED。我们发现,在单组分系统(那些没有检测到的冷组分)的温暖的组件遵循原始雪线,而不是目前的雪线,所以他们可能来自外小行星带。虽然双组分系统中许多温暖组分的位置也与原始雪线一致,但这些系统之间存在更多的多样性,这表明其他效应也发挥了作用。

英文摘要:

The architectures of debris disks encode the history of planet formation in these systems. Studies of debris disks via their spectral energy distributions (SEDs) have found infrared excesses arising from cold dust, warm dust, or a combination of the two. The cold outer belts of many systems have been imaged, facilitating their study in great detail. Far less is known about the warm components, including the origin of the dust. The regularity of the disk temperatures indicates an underlying structure that may be linked to the water snow line. If the dust is generated from collisions in an exo-asteroid belt, the dust will likely trace the location of the water snow line in the primordial protoplanetary disk where planetesimal growth was enhanced. If instead the warm dust arises from the inward transport from a reservoir of icy material farther out in the system, the dust location is expected to be set by the current snow line. We analyze the SEDs of a large sample of debris disks with warm components. We find that warm components in single-component systems (those without detectable cold components) follow the primordial snow line rather than the current snow line, so they likely arise from exo-asteroid belts. While the locations of many warm components in two-component systems are also consistent with the primordial snow line, there is more diversity among these systems, suggesting additional effects play a role.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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