The regulation of angular momentum in star formation: the secret behind planet formation
恒星形成过程中角动量的调节:行星形成背后的秘密
基本信息
- 批准号:17F17802
- 负责人:
- 金额:$ 1.47万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for JSPS Fellows
- 财政年份:2017
- 资助国家:日本
- 起止时间:2017-11-10 至 2020-03-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The regulation of angular momentum is of prime importance during star formation, as it directly impacts the formation of planets, and the possible fragmentation of the protoplanetary disk leading to the creation of binary stars. The magnetic field plays a major role in this process by slowing down the rotation of the gas. The efficiency of this "braking" depends on the coupling between the magnetic field and the gas, which is related to the chemical environment. Three effects impact the coupling, and therefore the braking. They are "non-ideal magnetohydrodynamics (MHD) effects", namely the Ohmic diffusion, the Hall effect and the ambipolar diffusion. The magnetic field can also launch protostellar outflows, that remove mass and angular momentum from the proto-stellar system.During the second year of his fellowship, Dr. Marchand have performed numerical simulations of star formation using the eulerian code RAMSES, that includes self-gravity and the ambipolar diffusion. He has studied how the magnetic braking was impacted by the ambipolar diffusion in different chemical environments and with different initial conditions. He determined that in every situation, the magnetic braking removes more angular momentum from the disk than the outflows, which is still a debated question. He found that reducing the number of small dust grains leads to a moderately larger disk, but significantly weaker magnetic braking and protostellar outflows. In this situation, he also found an ionic precursor to the protostellar outflow, a phenomenon never reported before.
角动量的调节在星星形成过程中至关重要,因为它直接影响行星的形成,以及原行星盘的可能碎裂导致双星的产生。磁场通过减慢气体的旋转在这个过程中起着重要作用。这种“制动”的效率取决于磁场和气体之间的耦合,这与化学环境有关。有三种效应影响联轴器,进而影响制动。它们是“非理想磁流体力学(MHD)效应”,即欧姆扩散、霍尔效应和双极扩散。磁场也可以发射原恒星外流,从原恒星系统中去除质量和角动量。在他的研究员的第二年,Marchand博士使用欧拉代码RAMSES进行了星星形成的数值模拟,其中包括自引力和双极扩散。 他研究了在不同的化学环境和不同的初始条件下,双极扩散对磁制动的影响。他确定,在任何情况下,磁制动从磁盘上移除的角动量都比流出的多,这仍然是一个有争议的问题。他发现,减少小尘埃颗粒的数量会导致一个适度较大的磁盘,但明显较弱的磁制动和原恒星外流。在这种情况下,他还发现了原恒星外流的离子前体,这是一种以前从未报道过的现象。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Impact of the Hall effect in star formation, improving the angular momentum conservation
霍尔效应对恒星形成的影响,改善角动量守恒
- DOI:10.1051/0004-6361/201936215
- 发表时间:2019
- 期刊:
- 影响因子:6.5
- 作者:Marchand P.;Tomida K.;Commercon B.;Chabrier G.
- 通讯作者:Chabrier G.
Impact of the Hall effect in star formation and the issue of angular momentum conservation
霍尔效应对恒星形成的影响和角动量守恒问题
- DOI:10.1051/0004-6361/201832907
- 发表时间:2018
- 期刊:
- 影响因子:6.5
- 作者:Marchand;P.; Commercon;B.; Chabrier;G.
- 通讯作者:G.
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
長峯 健太郎其他文献
長峯 健太郎的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
相似海外基金
Studying Magnetized Binary Star Formation with ALMA
使用 ALMA 研究磁化双星形成
- 批准号:
23K22542 - 财政年份:2024
- 资助金额:
$ 1.47万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Unveiling High-Mass Star Formation in Low Metallicity Environments through state-of-the-art Observations
通过最先进的观测揭示低金属丰度环境中的高质量恒星形成
- 批准号:
24K17103 - 财政年份:2024
- 资助金额:
$ 1.47万 - 项目类别:
Grant-in-Aid for Early-Career Scientists
Leveraging a Zooniverse Discovery to Bridge Our Understanding of Low- and High-mass Star Formation
利用动物宇宙的发现来加深我们对低质量和高质量恒星形成的理解
- 批准号:
2307806 - 财政年份:2023
- 资助金额:
$ 1.47万 - 项目类别:
Standard Grant
Collaborative Research: RUI: Tracing Galaxy Quenching in the Cosmic Web With Spatially-Resolved Star-Formation Maps
合作研究:RUI:用空间分辨的恒星形成图追踪宇宙网中的星系淬火
- 批准号:
2308127 - 财政年份:2023
- 资助金额:
$ 1.47万 - 项目类别:
Standard Grant
Collaborative Research: Spatially Resolving the Mechanisms of Star Formation Quenching Using Molecular Gas Observations
合作研究:利用分子气体观测空间解析恒星形成淬灭的机制
- 批准号:
2307441 - 财政年份:2023
- 资助金额:
$ 1.47万 - 项目类别:
Standard Grant
Taking census of dust-obscured star formation up to the epoch of reionization
对尘埃遮蔽的恒星形成进行普查直至再电离时代
- 批准号:
23K13150 - 财政年份:2023
- 资助金额:
$ 1.47万 - 项目类别:
Grant-in-Aid for Early-Career Scientists
An Empirical Investigation of Social Antecedents of Star Formation
恒星形成的社会前因的实证研究
- 批准号:
23K18793 - 财政年份:2023
- 资助金额:
$ 1.47万 - 项目类别:
Grant-in-Aid for Research Activity Start-up
Born in starbursts: exploring star formation in extreme environments
诞生于星爆:探索极端环境下的恒星形成
- 批准号:
2891054 - 财政年份:2023
- 资助金额:
$ 1.47万 - 项目类别:
Studentship
Star Formation Through Cosmic Time
宇宙时间中的恒星形成
- 批准号:
DP230102280 - 财政年份:2023
- 资助金额:
$ 1.47万 - 项目类别:
Discovery Projects
Magnetic Zooms: Testing how magnetic fields shape galaxy structure and star formation
磁变焦:测试磁场如何塑造星系结构和恒星形成
- 批准号:
2904459 - 财政年份:2023
- 资助金额:
$ 1.47万 - 项目类别:
Studentship