Processing of chondritic and planetary material in spiral density waves in the nebula
Processing of chondritic and planetary material in spiral density waves in the nebula
复制标题
星云螺旋密度波中球粒陨石和行星物质的处理
DOI：
--
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
J. Wood
中科院分区：
文献类型：
--
作者：
J. Wood
- 一个被广泛接受的星云演化观点是，在10.5 Ma期间，星际物质坍缩到盘上，后者的质量增长到引力不稳定的点。它的反应是失去轴对称，生长出螺旋臂，能够潮汐地重新分配盘质量（向内）和角动量（向外），并防止盘/原太阳质量比进一步增加。旋臂（密度波）的旋转方式与星云的物质不同，在盘的某些部分，星云物质可能以超音速遇到旋臂。盘状气体和夹带在其中的固体颗粒在通过螺旋臂前缘处的激波阵面时，会被加热到某种程度。本文提出，这是长期以来一直在寻找的高能星云环境或环境，在这种环境中，行星和陨石中的物质被热处理。
— A widely held view of nebular evolution is that during the ∼0.5 Ma while interstellar material was collapsing onto the disk, the latter grew in mass to the point of gravitational instability. It responded to this by losing axial symmetry, growing spiral arms that had the capacity to tidally redistribute disk mass (inward) and angular momentum (outward) and prevent further increase in the disk/protosun mass ratio. The spiral arms (density waves) rotated differently than the substance of the nebula, and in some parts of the disk, nebular material may have encountered the arms at supersonic velocities. The disk gas, and solid particles entrained in it, would have been heated to some degree when they passed through shock fronts at the leading edges of the spiral arms. The present paper proposes this was the energetic nebular setting or environment that has long been sought, in which the material now in the planets and chondritic meteorites was thermally processed.