Accretion and outflows in the limit of weak stellar magnetic fields: does the magnetospheric accretion paradigm apply to Herbig AeBe stars?

弱恒星磁场极限下的吸积和流出：磁层吸积范式是否适用于 Herbig AeBe 恒星？

• 批准号: 1311698
• 负责人: John Monnier
• 金额: $ 41.66万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1311698&HistoricalAwards=false
• 关键词: Accretion; outflows; limit; weak; stellar

The goal of this proposal is to investigate the mass transfer mechanism between the accretion disk and the central star in Herbig Ae/Be systems. Herbig Ae/Be stars are intermediate-mass, pre-main-sequence protostars that show evidence of inflow and outflow motions similar to their lower-mass T Tauri star counterparts. In the case of T Tauri stars, the inflow from the disk to the star is generally thought to be the result of magnetospheric accretion, while mass is transferred out of the system via magnetically driven outflows. These mass transfer mechanisms require strong dipolar fields, which are present in T Tauri stars but are generally not found in Herbig Ae/Be stars. The proposed investigation of magnetically driven inflow and outflow processes in young Herbig AE/Be stars will be accomplished through a coordinated program of interferometric and spectroscopic observations along with advanced numerical modeling. This research will provide valuable insight regarding accretion and wind-generated mass loss as they relate to the formation of stars. The proposed project will also contribute to scientific workforce development through the support of a co-PI who is currently a postdoc soon to become a research scientist at the Univ. of Michigan. The project includes public outreach goals that will be accomplished through the development of new exhibits for the historical Detroit Observatory recently re-opened in Ann Arbor, MI. These exhibits will foster scientific literacy with an emphasis on the fundamentals of astronomical research.

该提案的目的是研究Herbig AE/BE系统中积聚磁盘和中央恒星之间的传质机制。 Herbig ae/be恒星是中间质量的，预先序列的原始质恒星，显示出类似于其低质量T牛里星的流入和流出运动的证据。 对于T Tauri恒星，通常认为从磁盘到恒星的流入被认为是磁层积聚的结果，而质量是通过磁驱动的流出的流出的。 这些传质机制需要强大的偶极场，这些偶极场存在于T Tauri恒星中，但通常在Herbig Ae/Be恒星中没有发现。 拟议的对年轻Herbig AE/BE星星中磁驱动的流入和流出过程的研究将通过协调的干涉测量和光谱观测程序以及高级数值建模来完成。 这项研究将为与恒星的形成有关，就积聚和风产生的质量损失提供宝贵的见解。 拟议的项目还将通过Co-Pi的支持来为科学劳动力的发展做出贡献，该公司目前很快成为大学的研究科学家。密歇根州。 该项目包括通过开发最近在密歇根州安阿伯市重新开放的底特律天文台的新展览来实现的公共外展目标。 这些展览将促进科学素养，重点是天文学研究的基础。

项目成果

Gemini-LIGHTS: Herbig Ae/Be and Massive T Tauri Protoplanetary Disks Imaged with Gemini Planet Imager

• DOI: 10.3847/1538-3881/ac7be4
• 发表时间: 2022-06
• 期刊: The Astronomical Journal
• 作者: Evan A. Rich;J. Monnier;A. Aarnio;A. Laws;B. Setterholm;D. Wilner;N. Calvet;T. Harries;Chris Miller;C. Davies;F. Adams;S. Andrews;J. Bae;C. Espaillat;A. Greenbaum;S. Hinkley;S. Kraus;L. Hartmann;A. Isella;M. McClure;R. Oppenheimer;L. P'erez;Zhaohuan Zhu

Multiple Spiral Arms in the Disk around Intermediate-mass Binary HD 34700A

• DOI: 10.3847/1538-4357/aafe87
• 发表时间: 2019-01
• 期刊: The Astrophysical Journal
• 作者: J. Monnier;T. Harries;J. Bae;B. Setterholm;A. Laws;A. Aarnio;F. Adams;S. Andrews;N. Calvet

Probing the Inner Disk Emission of the Herbig Ae Stars HD 163296 and HD 190073

• DOI: 10.3847/1538-4357/aaef2c
• 发表时间: 2018-11
• 期刊: The Astrophysical Journal
• 作者: B. Setterholm;J. Monnier;C. Davies;A. Kreplin;S. Kraus;F. Baron;A. Aarnio;J. Berger;N. Calvet-N.-Ca