Infalling Planetesimals in Young Star Clusters

年轻星团中坠落的星子

• 批准号: 0205895
• 负责人: Catherine Pilachowski
• 金额: $ 13万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-01 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0205895&HistoricalAwards=false
• 关键词: Infalling; Planetesimals; Young; Star; Clusters

PI: PilachowskiDr. Pilachowski is awarded funds at Indiana University to use the recently discovered "falling evaporative bodies" (FEBs) in young star systems to study the timescale for the formation of planets. FEBs are planetesimals whose orbits are perturbed by newly formed planets. The planetesimals are either ejected from the planetary system or sent inward on orbits that impact or graze the central star. Near the star, the planetesimals are heated and turned to gas, and can be detected by their transient spectral absorption features. The FEBs offer direct evidence of planets and planetesimals in the star system, and also provide information about the dynamics of the system and the composition of the planetesimals. Observations of FEBs in a sample of young stars with well-defined masses and ages may constrain the timescale of planet formation and/or the mechanism of orbital migration. Dr. Pilachowski will examine late B and early A dwarf stars in young star clusters ranging in age from a few million years up to 30 million years to explore the timescales over which planetesimals may be cleared out of young solar systems by the formation of planets and by orbital migration. The stars will be monitored spectroscopically using the 3.5-m Wisconsin-Indiana-Yale-NOAO (WIYN) telescope and multi-object spectrograph. The PI will involve both graduate and undergraduate students in the work, and expects that this study of "comets" in extra-solar planetary systems is likely to attract broad public interest and to fire the imaginations of children. ***

PI: PilachowskiDr。皮拉考斯基获得了印第安纳大学的资助，利用最近在年轻恒星系统中发现的“下落蒸发体”（FEBs）来研究行星形成的时间尺度。feb是轨道被新形成的行星扰乱的星子。这些星子要么被从行星系统中喷射出来，要么被送入撞击或掠过中心恒星的轨道。在恒星附近，星子被加热并变成气体，可以通过它们的瞬态光谱吸收特征来检测。feb提供了恒星系统中行星和星子的直接证据，也提供了关于系统动力学和星子组成的信息。在质量和年龄明确的年轻恒星样本中观测feb可能会限制行星形成的时间尺度和/或轨道迁移的机制。皮拉考斯基博士将研究年龄从几百万年到3000万年的年轻星团中的B晚期和A早期矮星，以探索在什么时间尺度上，行星的形成和轨道迁移可能会把星子从年轻的太阳系中清除出去。这些恒星将使用3.5米的威斯康星-印第安纳-耶鲁- noao （WIYN）望远镜和多目标摄谱仪进行光谱监测。PI将让研究生和本科生都参与这项工作，并期望这项对太阳系外行星系统中的“彗星”的研究可能会吸引广泛的公众兴趣，并激发孩子们的想象力。＊＊＊