Collaborative Research: The Evolution of Winds in Dust Disks Around Stars

合作研究：恒星周围尘埃盘中风的演化

• 批准号: 1714229
• 负责人: Suzan Edwards
• 金额: $ 6.79万
• 依托单位: Smith College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-01 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1714229&HistoricalAwards=false
• 关键词: Collaborative; Research; Evolution; Winds; Dust

Planets formed from material in disks of gas and dust that once surrounded the stars they orbit. The way that these disks form and how material is spread throughout the disks affect both how quickly material is added to the stars themselves and what types of planets can form in the disks. Disk winds play a major role in the way this material is dispersed. In this study, the investigators build on their earlier work where they observed the disk winds in 33 disks. They observed two parts to the winds: a wind driven by magnetic/electric interactions and a wind driven by temperature differences. With this grant the investigators will extend their study to include a large number of much older disks with the goals of measuring how much the magnetic/electric process drives with wind and how much the thermal heating drives the wind. This project serves the national interest as it expands our understanding of the science behind the formation of planetary systems around other stars. A graduate student, a postdoc, and at least three undergraduate students will participate in this study. The investigators will also participate in a K-12 teacher workshop at The University of Arizona, reaching Hispanic and Native American communities. A two-week long astronomy class will be taught to high school girls from around the world in the annual Smith Summer Science and Engineering Program. The analysis of optical [OI] emission lines for the 33 disks in Taurus reveals two low-velocity kinematic components, one of which (broad component) likely traces a magnetohydrodynamic (MHD)-driven wind while the other (narrow component) might be associated with a thermally-driven wind. The investigators will establish empirically how disk winds evolve by measuring the relative proportion of MHD-driven and thermally-driven winds. They will also measure wind mass loss rates through the main stages of disk evolution and dispersal. They will extend their analysis of the [OI] lines to a sample of more evolved disks, including more disks with dust cavities, and analyze one of the blue [SII] transitions to clarify the thermal contribution to the [OI] emission.

行星是由曾经围绕着它们绕星星的气体和灰尘磁盘中的材料形成的。这些磁盘形成的方式以及材料如何在整个磁盘中散布的方式会影响材料的添加方式，以及在磁盘中可以形成哪种类型的行星。磁盘风在这种材料分散的方式中起着重要作用。在这项研究中，研究人员在他们的早期工作基础上观察到33个磁盘中的磁盘风。他们观察到风的两个部分：由磁/电动相互作用驱动的风和温度差异驱动的风。借助这项赠款，研究人员将扩展其研究，以包括大量较旧的磁盘，其目标是测量磁性/电动过程用风驱动的目标以及热加热驱动了多少驱动风。该项目为国家的利益提供了服务，因为它扩展了我们对其他恒星围绕行星系统形成的科学的理解。研究生，博士后和至少三名本科生将参加这项研究。调查人员还将参加亚利桑那大学的K-12教师研讨会，到达西班牙裔和美洲原住民社区。在一年一度的史密斯夏季科学与工程计划中，将教授为期两周的长期天文学课。金牛座33个磁盘的光学[OI]发射线的分析揭示了两个低速运动学组件，其中一种（广泛的组件）可能会捕获磁性水力动力学（MHD）驱动的风，而另一个可能与热驱动风相关。研究人员将通过凭经验确定磁盘风如何通过测量MHD驱动和热驱动的风的相对比例来发展。他们还将通过磁盘进化和分散的主要阶段测量风质损失率。他们将将对[OI]线的分析扩展到更多进化的磁盘样本，包括更多带有灰尘空腔的磁盘，并分析蓝色[SII]过渡之一，以阐明对[OI]发射的热贡献。

项目成果

A New Look at T Tauri Star Forbidden Lines: MHD-driven Winds from the Inner Disk

• DOI: 10.3847/1538-4357/aae780
• 发表时间: 2018-10
• 期刊: The Astrophysical Journal
• 作者: M. Fang;I. Pascucci;S. Edwards;U. Gorti;A. Banzatti;M. Flock;P. Hartigan;G. Herczeg;A. Dupree

Double-peaked [O i] Profile: A Likely Signature of the Gaseous Ring around KH 15D

• DOI: 10.3847/2041-8213/ab288d
• 发表时间: 2019-06
• 期刊: The Astrophysical Journal Letters
• 作者: M. Fang;I. Pascucci;J. Kim;S. Edwards

The Evolution of Disk Winds from a Combined Study of Optical and Infrared Forbidden Lines

• DOI: 10.3847/1538-4357/abba3c
• 发表时间: 2020-09
• 期刊: The Astrophysical Journal
• 作者: I. Pascucci;A. Banzatti;U. Gorti;M. Fang;K. Pontoppidan;R. Alexander;G. Ballabio;S. Edwards;C. Salyk;G. Sacco;E. Flaccomio;G. Blake;A. Carmona;C. Hall;I. Kamp;H. Käufl;G. Meeus;M. Meyer;T. Pauly;S. Steendam;M. Sterzik