Exploring the Relationship Between Stellar Mass and Planet Occurrence

探索恒星质量与行星出现之间的关系

• 批准号: 0702821
• 负责人: John Johnson
• 金额: --
• 依托单位: Johnson John A
• 依托单位国家: 美国
• 项目类别: Fellowship
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-08-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0702821&HistoricalAwards=false
• 关键词: Exploring; Relationship; Between; Stellar; Mass

Dr. John Johnson is awarded an NSF Astronomy and Astrophysics Postdoctoral Fellowship to carry out a program of research and education at the Institute for Astronomy at the University of Hawaii. Over 150 nearby stars are known to harbor planetary companions, and the physical properties of these host stars provide an important link between the planets detected today and the circumstellar environments from which they formed. Determining the relationship between stellar mass and planet occurrence provides an important test of the core accretion model of planet formation, which predicts how the fraction of stars with planets increases with stellar mass. To measure the occurrence rate of planets as a function of mass, the PI will conduct a precision Doppler survey of intermediate-mass subgiants at Keck Observatory. Subgiants are ideal planet-search candidates due to their narrower spectral lines and lower atmospheric noise compared to their early-type progenitors. This search probes a unique stellar parameter space and will double the mass range of current Keck Doppler surveys.Dr. Johnson will also implement a program of educational outreach in elementary schools using hands-on and multimedia activities that merge planetary science and state-mandated science standards. The lesson plans will be taught in collaboration with Honolulu-area 4th- and 5th-grade teachers. The activities are designed to take students on a journey that begins at the Sun, progresses through the planets of our Solar System, and culminates with the exotic worlds recently discovered around other stars. By serving as a minority role model, Dr. Johnson is uniquely positioned to encourage young, underrepresented students to pursue careers in astronomy.

约翰·约翰逊（John Johnson）博士被授予NSF天文学和天体物理学博士后奖学金，以在夏威夷大学的天文学研究所进行研究和教育计划。已知有150多个附近的恒星具有行星伴侣，这些宿主恒星的物理特性提供了当今检测到的行星与它们形成的折叠环境之间的重要联系。确定恒星质量与行星的发生之间的关系提供了对行星形成的核心积聚模型的重要测试，这可以预测恒星与行星的分数如何随着恒星质量的增加而增加。为了测量行星的发生率随质量的函数，PI将对凯克天文台的中间质量亚巨人进行精确的多普勒调查。与早期型祖细胞相比，亚巨人是理想的星球搜索候选者，因为它们的光谱线较窄和较低的大气噪声。该搜索探讨了一个唯一的恒星参数空间，并将将当前凯克多普勒调查的质量范围倍增。约翰逊还将使用动手和多媒体活动在小学中实施一项教育外展计划，并合并行星科学和国家规定的科学标准。该课程将与檀香山四年级和五年级的老师合作教授。这些活动的目的是使学生进入从阳光下开始的旅程，贯穿我们太阳系的行星，并与最近在其他恒星周围发现的异国情调的世界达到顶峰。通过担任少数派榜样，约翰逊博士在鼓励年轻，代表性不足的学生从事天文学的职业方面的独特位置。