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.

本计划的目标是研究Herbig Ae/Be系统中吸积盘与中心星星之间的质量传递机制。 赫比格Ae/Be星是中等质量的前主序星，显示出类似于低质量金牛座T星星的流入和流出运动的证据。 在金牛T型恒星的例子中，从盘到星星的流入通常被认为是磁层吸积的结果，而质量通过磁驱动的流出转移到系统之外。 这些质量转移机制需要强偶极场，这在金牛座T星中存在，但在赫比格Ae/Be星中通常没有发现。 拟议的调查磁驱动的流入和流出过程中的年轻赫比格AE/Be星将通过一个协调的计划，干涉和光谱观测沿着与先进的数值模拟。 这项研究将提供有关吸积和风产生的质量损失的宝贵见解，因为它们与恒星的形成有关。 拟议的项目还将通过共同PI的支持，为科学劳动力的发展做出贡献，该PI目前是博士后，不久将成为密歇根大学的研究科学家。 该项目包括公共宣传目标，将通过为最近在密歇根州安阿伯重新开放的历史性底特律天文台开发新展品来实现。 这些展览将培养科学素养，重点是天文研究的基础知识。

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

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

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