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Title: 初期原始惑星系円盤化学構造進化
Other Titles: Evolution of chemical structure of a protoplanetary disk
Authors: 永原, 裕子1 Browse this author
Authors(alt): Nagahara, Hiroko1
Keywords: 原始惑星系円盤
Protoplanetary disk
chemical composition
Issue Date: 24-Mar-2020
Publisher: 低温科学第78巻編集委員会
Journal Title: 低温科学
Volume: 78
Start Page: 115
End Page: 125
Abstract: 原始惑星系円盤の進化は惑星形成の場であり,その進化解明は天文学,惑星科学における重要課題 の一つである.しかし,望遠鏡による観測,円盤進化の物理モデル,隕石や彗星塵からえられる実証 的なデータの間には多くの不整合があり,それらを整合的に理解することが求められている.本研究 では原始惑星系円盤進化の物理と化学をつなぐ試みの一つとして,固体微粒子の運動を追跡し,粒子 の化学進化を調べた.その結果,円盤は初期は化学的に不均質であるが,105 年程度の間に物質の移 動・混合が進行し,以後はほとんど均質になることがわかった.本研究の結果は,惑星が異なる化学 組成を持つためには105 年程度の間に急速に集積・合体しなくてはならないことを示しており,観測 による若い円盤の多様な構造形成とも調和的である.
The evolution of protoplanetary disks is one of the most intensely debated issues in astronomy and planetary science, since the disk is the formation site of planets. There are numerous inconsistencies and missing links among physicalmodelsofdisks,astronomicalobservations,andevidencefrommeteoritestudies.Inthepresentwork,anew model was developed combining physics and chemistry in a protoplanetary disk to solve these inconsistencies. We investigated the chemical evolution of protoplanetary disks with a special interest on the transportation of dust particles in a spatially and temporally changing disk. We found that planets with different chemical compositions shouldhavebeenformedintheearlystageofdiskevolution(~105 years);otherwise,thesolidmaterialsinthedisk,and thus the resultant planetary system, would become chemically homogeneous. The early formation of planetesimals (and planets) is consistent with recent observation of protoplanetary disks with structures that are thought to have been formed by the interaction between the disk and large planets.
Type: bulletin (article)
Appears in Collections:低温科学 = Low Temperature Science > 第78巻

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