Cool Dust and Gas in Transitional and Debris Disks

冷却过渡盘和碎片盘中的灰尘和气体

• 批准号: 0808144
• 负责人: Jonathan Williams
• 金额: $ 26.42万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-06-15 至 2012-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0808144&HistoricalAwards=false
• 关键词: Cool; Dust; Gas; Transitional; Debris

In this project, Dr. Jonathan Williams (University of Hawaii) will study the line and continuum emission from circumstellar disks in the late stages of evolution, as they transition from an inner hole to a planet-forming debris system. Circumstellar disks are an inevitable by-product of star formation and the birthplaces of extrasolar planets. The formation of planets themselves generates additional dust that may be observed long after the star has formed and has settled onto the main sequence. Disks are readily detectable in the infrared but the emission is optically thick and is a poor measure of the mass, especially in the outer regions. Observations in the submillimeter regime allow total disk masses to be determined. Dust grain sizes are constrained from the slope of the energy distribution, imaging locates the larger particles that are influenced more by the gravity of a protoplanet than the radiation from the central star, and line observations reveal the disk kinematics. The program will be carried out using the James Clerk Maxwell Telescope and the Submillimeter Array, submillimeter observing facilities on Mauna Kea, Hawaii. In addition to the contribution this research will make in our understanding of the evolution of circumstellar disks, this work will also contribute to the education and training of students in areas of submillimeter astronomy and interferometry. The project will support the dissertation research of a graduate student and an undergraduate student will also participate in the project by assisting in observing runs on Mauna Kea and collating ancillary data on the observed disks. This project, with its implications for planet formation, will be of broad interest and the Dr. Williams will continue to give public talks in this field through an established outreach lecture series at the University of Hawaii's Institute for Astronomy.

在这个项目中，乔纳森·威廉姆斯（Jonathan Williams）博士（夏威夷大学）将在进化的晚期从内心磁盘从内心磁盘从内部孔过渡到形成行星形成的碎片系统，从而研究线和连续的发射。 双盘是恒星形成的不可避免的副产品和极性行星的出生地。行星本身的形成会产生额外的灰尘，这些灰尘可能在恒星形成并已定位在主序列上。 磁盘在红外线中很容易检测到，但发射在光学上是厚的，并且是对质量的量度较差，尤其是在外部区域。 亚毫米级制度的观察可以确定总磁盘质量。 灰尘粒度受到能量分布的斜率的限制，成像位置的位置比中心恒星的辐射更大的颗粒更大的颗粒，这些颗粒受到原子星的重力的影响，并且线观测揭示了磁盘运动学。 该计划将使用James Clerk Maxwell望远镜和夏威夷Mauna Kea的亚毫米观测设施进行。除了这项研究的贡献外，我们还将在我们对情节磁盘发展的理解中做出贡献，这项工作还将有助于亚毫米级天文学和干涉测量学领域的学生的教育和培训。该项目将支持研究生的论文研究，并且本科生也将通过协助观察Mauna Kea的运行并在观察到的磁盘上进行辅助数据来参与该项目。该项目对行星形成的影响将引起广泛关注，威廉姆斯博士将继续通过夏威夷大学天文学研究所的既定外展演讲系列在这一领域进行公开谈判。