2026-03-13T02:24:45Z https://jaxa.repo.nii.ac.jp/oai

oai:jaxa.repo.nii.ac.jp:00038386 2023-06-20T22:41:27Z 1887:1891

Gravitational instabilities in a dust layer and the condition for the formation of compound chondrules 関谷, 実 中村, 智樹 Sekiya, Minoru Nakamura, Tomoki metadata only access 惑星進化 太陽星雲 分子雲 地球型惑星 小惑星衝突 コンドルール 重力不安定性 衝突速度 planetary evolution solar nebula molecular cloud terrestrial planet asteroid collision chondrule gravitational instability collision velocity If a compound chondrule was formed by collisional sticking of a plastic particle with a solid or another plastic particle, the following conclusions are derived: (1) Chondrules were formed after the settling of dust particles had progressed and the number density of dust particles had increased for several orders of magnitude. (2) Collisional velocities of pre-chondrule particles to form observed ratio of the compound chondrules should have been larger than 3 m/sec, as far as chondrules were formed in the asteroid region; otherwise, the dust layer should have fragmented to form planetesimals. (3) If chondrules had been formed in inner regions of the solar nebula, the lower limit of the relative velocity of the pre-chondrule particles would be reduced (e.g. 40 cm/sec for the terrestrial region). 資料番号: AA0063352019 宇宙航空研究開発機構宇宙科学研究本部 Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS) 1995-12 eng conference paper https://jaxa.repo.nii.ac.jp/records/38386 第28回月・惑星シンポジウム Proceedings of the 28th ISAS Lunar and Planetary Symposium 73 76