ワダ　コウジ   WADA Koji   和田　浩二    所属   千葉工業大学  惑星探査研究センター 惑星探査研究センター    職種   主席研究員
言語種別	英語
発行・発表の年月	2012
形態種別	学術雑誌
査読	査読あり
標題	Geometrical cross sections of dust aggregates and a compression model for aggregate collisions
執筆形態	共著
掲載誌名	Astrophys. J.
巻・号・頁	753,pp.115 (10pp)
著者・共著者	Suyama, T., Wada, K., Tanaka, H., and Okuzumi, S.
概要	Geometric cross sections of dust aggregates determine their coupling with disk gas, which governs their motions in protoplanetary disks. Collisional outcomes also depend on geometric cross sections of initial aggregates. In the present study, we examine geometric cross sections of the aggregates. Their cross sections decrease due to compression as well as to their gyration radii. It is found that a relation between the cross section and the gyration radius proposed by Okuzumi et al. is valid for the compressed aggregates. We also refine the compression model proposed in our previous paper. The refined model enables us to calculate the evolution of both gyration radii and cross sections of growing aggregates and reproduces well our numerical results of sequential aggregate collisions.