Formation and Physical Properties of Substellar Objects

次恒星天体的形成和物理性质

• 批准号: 0507833
• 负责人: Michael Liu
• 金额: $ 37.07万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-01 至 2010-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0507833&HistoricalAwards=false
• 关键词: Formation; Physical; Properties; Substellar; Objects

AST-0507833Michael LiuUniversity of HawaiiFormation and Physical Properties of Substellar ObjectsABSTRACTThe goal of the work is to explore the multiplicity of brown dwarfs, to determine the physicalproperties of substellar binaries, and to find low-temperature/low-mass brown dwarf and planetarycompanions. This is motivated by the need for better statistical properties of substellar populationsin order to understand their formation. The techniques to be used are high angular resolutioninfrared imaging of large samples of brown dwarfs to reveal binary companions (and extract thebinary frequency, separation distribution, and mass ratio distribution of the population) and tosearch for very low temperature (Y-class brown dwarf and planetary) companions, and imagingplus near-IR spectroscopy to determine the physical properties of the binary members (particularlydynamical masses and temperatures, which can in turn be used to test theoretical models). Theproject will be carried out using the Keck Laser Guide Star Adaptive Optics system.A postdoctoral fellow will be trained in laser guide star adaptive objects - a growing and potentiallyvery important tool within the astronomical community. The training of an undergraduate is alsoincluded, who will participate through the NSF sponsored Research Experiences forUndergraduates program at the Institute for Astronomy at Hawaii.

AST-0507833 Michael Liu夏威夷大学亚恒星天体的形成和物理性质摘要这项工作的目标是探索棕矮星的多样性，确定亚恒星双星的物理性质，并寻找低温/低质量的棕矮星和行星伴星。这是出于需要更好的统计性质的亚恒星populationin为了了解他们的形成。将使用的技术是对大样本褐矮星进行高角分辨率红外成像，以揭示双星伴星（并提取二进制频率，分离分布，和质量比分布的人口）和搜索非常低的温度（Y级褐矮星和行星）同伴，以及成像加上近红外光谱，以确定二元成员的物理性质（特别是动力学质量和温度，这反过来又可以用来测试理论模型）。该项目将使用凯克激光引导星星自适应光学系统进行。一名博士后研究员将接受激光引导星星自适应物体的培训-这是天文学界一种不断发展且可能非常重要的工具。本科生的培训也包括在内，他们将通过美国国家科学基金会赞助的夏威夷天文研究所的本科生研究经验计划参加。