文章基本信息

标题：Orbital evolution of planetesimals in gaseous disks
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作者：Hiroshi Kobayashi
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2015
卷号：67
期号：1
页码：1-7
DOI：10.1186/s40623-015-0218-y
出版社：Springer Verlag
摘要：Planets are formed from collisional growth of small bodies in a protoplanetary disk. Bodies much larger than approximately 1 m are mainly controlled by the gravity of the host star and experience weak gas drag; their orbits are mainly expressed by orbital elements: semimajor axes a , eccentricities e , and inclinations i , which are modulated by gas drag. In a previous study, \(\dot a\) , \(\dot e\) , and \(\dot i\) were analytically derived for e ≪1 and i ≪ H / a , where H is the scale height of the disk. Their formulae are valid in the early stage of planet formation. However, once massive planets are formed, e and i increase greatly. Indeed, some small bodies in the solar system have very large e and i . Therefore, in this paper, I analytically derive formulae for \(\dot a\) , \(\dot e\) , and \(\dot i\) for 1− e 2 π − H / a . Since the derived formulae are applicable for bodies not only in a protoplanetary disk but also in a circumplanetary disk, I discuss the possibility of the capture of satellites in a circumplanetary disk using the formulae.
关键词：Planet formation ;Asteroids ;Comets