Growth of amorphous ice grains by sintering in a protoplanetary disk

IF 2.5 2区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Icarus Pub Date : 2024-11-19 DOI:10.1016/j.icarus.2024.116370

Sin-iti Sirono

引用次数: 0

Abstract

An icy grain in a protoplanetary nebula mainly consists of amorphous H

_{2}

O ice and can grow through the migration of H

_{2}

O molecules (sintering). The growth rate through sintering strongly depends on the diffusion constant of H

_{2}

O molecules. I estimated the size of amorphous ice grains as a function of the sintering duration based on the diffusion constant of amorphous ice determined by the molecular dynamics simulation. It has been found that the growth proceeds in a wide disk region (

\sim 20

AU), and grain can grow to

\sim 1 0^{- 3}

cm around the snowline. The growth of the icy grains can affect the evolution of the icy dust aggregates in a protoplanetary disk.

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在原行星盘中通过烧结生长非晶态冰粒

原行星状星云中的冰粒主要由无定形的 H2O 冰组成，可以通过 H2O 分子的迁移（烧结）而生长。烧结的增长速度在很大程度上取决于 H2O 分子的扩散常数。我根据分子动力学模拟确定的非晶态冰的扩散常数，估算了非晶态冰粒的大小与烧结持续时间的函数关系。研究发现，冰粒的生长是在一个较宽的圆盘区域（∼20AU）内进行的，冰粒在雪线附近可以长到∼10-3厘米。冰颗粒的生长会影响原行星盘中冰尘埃聚集体的演化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Icarus 地学天文-天文与天体物理

CiteScore

6.30

自引率

18.80%

发文量

356

审稿时长

2-4 weeks

期刊介绍： Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.