arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1003.5229astro-ph.EP
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碎片碎片:看到尘埃,思考星子和行星

Debris Disks: Seeing Dust, Thinking of Planetesimals and Planets

Alexander V. Krivov

摘要:

碎片盘是光学上薄的,几乎不含气体的尘埃盘,在年龄超过1千万年的主序星中有相当一部分的恒星周围被观测到。由于星周尘埃的寿命很短,这些盘的存在被认为是产生尘埃的星子仍然存在于成熟系统中的证据,在这些系统中,行星已经形成-或未能形成-很久以前。据推测,这些微行星以小行星到柯伊伯带的距离绕其宿主恒星运行,并通过相互碰撞不断提供新的尘埃。本文概述了碎片盘的观测技术和结果,总结了它们的基本物理和理论模型,然后将它们置于行星系的一般背景下,揭示了盘,尘埃母体和行星之间的相互关系。它表明,碎片盘可以作为微行星和行星的示踪剂,揭示了微行星和行星形成的过程中,在这些系统中运行的过去。

英文摘要:

Debris disks are optically thin, almost gas-free dusty disks observed around a significant fraction of main-sequence stars older than about 10 Myr. Since the circumstellar dust is short-lived, the very existence of these disks is considered as evidence that dust-producing planetesimals are still present in mature systems, in which planets have formed - or failed to form - a long time ago. It is inferred that these planetesimals orbit their host stars at asteroid to Kuiper-belt distances and continually supply fresh dust through mutual collisions. This review outlines observational techniques and results on debris disks, summarizes their essential physics and theoretical models, and then places them into the general context of planetary systems, uncovering interrelations between the disks, dust parent bodies, and planets. It is shown that debris disks can serve as tracers of planetesimals and planets and shed light on the planetesimal and planet formation processes that operated in these systems in the past.

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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