Formation and Evolution of Primitive Solar Nebula

原始太阳星云的形成和演化

基本信息

批准号：
03640391
负责人：
NAKAGAWA Yositsugu
金额：
$ 1.28万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03640391/
关键词：
solar system origin primitive solar nebula solar nebula protoplanetary disks dust opacity shear instability T Tauri stars gravitational instability 原始惑星系円盤ダスト Tタウリ型星太陽系ガスーダスト円盤

项目摘要

For these two years we studied formation and evolution of the solar nebula. Our research consists of the following these studies: (i) Over-reflection and over-transmission of non-axisymmetric waves in differentially rotating disks with self-gravity, (ii) Formation and early evolution of the solar nebula, (iii) Effect of particle growth on opacity curves of protoplanetary disks around T Tauri stars. We give brief summaries of these studies below.Study(i): We quantitatively clarified phenomena of over-reflection and over-transmission of non- axisymmetric waves in differentially rotating disks and found that the self-gravity of the disks enhances these phenomena quite efficiently. These phenomena are considered as one of excitation mechanism of turbulence, and turbulence causes early evolution of the solar nebula.Study(ii): We numerically simulated the processes of formation and early evolution of the solar nebula. We obtained radial temperature distribution in the solar nebula which is consistent with observation of protoplanetary disks around T Tauri stars. The temperature distribution is kept by surface heating due to infall gas and by viscous heating in the nebula. We also found that in the gas infall phase the solar nebula becomes gravitationally unstable at a radial distance comparable to the size of the present solar system.Study(iii): We showed that dust growth in protoplanetary disks can quite naturally explain the diffrences in opacity between dust in protoplanetary disks and interstellar dust. We also showed that the opacity of grown dust gives an estimate of disk mass consistent with nominal solar nebula models.

在这两年中，我们研究了太阳星云的形成和演变。我们的研究包括以下研究：（i）在具有自我实力的差异旋转磁盘中非轴对称波的过度反射和过度转移，（ii）太阳星云的形成和早期演化，（iii）颗粒生长对Tauri tauri恒星周围粒子磁盘不透明度曲线的粒子生长效应。我们在下面进行了简要摘要。研究（i）：我们定量澄清了过度反射的现象和差异旋转磁盘中非轴对称波的过度转换，并发现磁盘的自我实现会增强这些现象的有效性。这些现象被认为是湍流的激发机制之一，湍流引起了太阳星云的早期演变。我们在太阳星云中获得了径向温度分布，这与观察到Tauri恒星周围的原星盘一致。温度分布是由于插入气体和星云中的粘性加热而通过表面加热保留的。我们还发现，在气体阶段，太阳星云在径向距离上变得不稳定，可与当前太阳系的大小相当。研究（III）：我们表明，普罗多内磁盘中的尘埃生长可以自然地解释了在普罗赛迪斯特磁盘和尘埃粉尘之间不透明度的差异。我们还表明，种植尘的不透明性给出了与名义太阳星云模型一致的磁盘质量的估计。