RECONS Explores the Long-Term Behavior of Nearby Red Dwarfs

RECONS 探索附近红矮星的长期行为

• 批准号: 2108373
• 负责人: Todd Henry
• 金额: $ 49.37万
• 依托单位: Georgia State University Research Foundation, Inc.
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2108373&HistoricalAwards=false
• 关键词: RECONS; Explores; Long; Term; Behavior

This project is conducting a reconnaissance of the nearest stars to the Sun, to a distance of about 80 light years. The team is focused on the long-term behavior of the smallest stars, known as red dwarfs. Although these are the smallest true stars, the red dwarfs are the largest in number, accounting for more than three-quarters of all stars. It is important to understand how the red dwarfs compare to the Sun in temperature, size, how active they are, and whether or not they are orbited by other stars or planets. This project will investigate what types of companions orbit these most common stars in the Galaxy and how the light from these stars changes over timescales of weeks to decades. This investigation will provide insight into the environments of the planets around such stars. The project also provides training for a diverse group of students in the techniques of astrometric observations and in managing data dissemination resources for the astronomical community, the media, and the wider public.The cornerstone of the RECONS (REsearch Consortium On Nearby Stars) effort is an observing program using a CCD camera at the SMARTS 0.9m telescope at the Cerro Tololo Inter-American Observatory in Chile, that has been underway since 1999. Observations, now extending for more than twenty years, are being made on a target sample of about five hundred of the nearest red dwarfs to discover and characterize the orbital architectures of stellar, brown dwarf, and Jovian planetary companions on Solar System scales. Additionally, monitoring of the photometric variability of the same stars permits characterization of changes over medium (rotation), and long (spot cycle) timescales. Such variability is linked to magnetic activity in the star. Such investigations are important as the answers provide insight into the environments experienced by orbiting planets around the most common stars in the Galaxy. The project also provides opportunities for young astronomers to learn astrometric and photometric techniques, as well as hands-on observing experience. Access to the SMARTS/0.9-meter telescope for this long term project and for the astronomical community will be maintained.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该项目正在对最近的恒星进行侦察，距离大约80光年。 该团队专注于最小的恒星的长期行为，即红矮人。尽管这些是最小的真正恒星，但红矮人的数量最大，占全明星中四分之三以上的占。 重要的是要了解红色矮人的温度，大小，活跃程度以及它们是否被其他恒星或行星绕旋转。 该项目将调查银河系中这些最常见的恒星的类型类型，以及这些恒星的光在几周到几十年的时间表中如何变化。 这项调查将洞悉此类恒星周围行星的环境。 The project also provides training for a diverse group of students in the techniques of astrometric observations and in managing data dissemination resources for the astronomical community, the media, and the wider public.The cornerstone of the RECONS (REsearch Consortium On Nearby Stars) effort is an observing program using a CCD camera at the SMARTS 0.9m telescope at the Cerro Tololo Inter-American Observatory in Chile, that has been underway since 1999年。现在已经延长了二十多年的观察结果，正在对约五百个最近的红色矮人的目标样本进行发现，以发现和表征太阳系量表上恒星，棕矮星和乔维安的行星伴侣的轨道体系结构。 另外，监测相同恒星的光度变异性允许表征介质（旋转）和长（斑点周期）时标的变化。 这种可变性与恒星中的磁活动有关。 此类调查很重要，因为答案可以洞悉通过银河系中最常见的恒星绕行星所经历的环境。 该项目还为年轻天文学家提供了学习天文学和光度法技术以及动手观察经验的机会。将维护这个长期项目和天文学社区的Smarts/0.9米望远镜的访问权限。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响审查标准，认为值得通过评估来获得支持。

项目成果

The LHS 1678 System: Two Earth-sized Transiting Planets and an Astrometric Companion Orbiting an M Dwarf Near the Convective Boundary at 20 pc

• DOI: 10.3847/1538-3881/ac32e3
• 发表时间: 2021-10
• 期刊: The Astronomical Journal
• 作者: M. Silverstein;J. Schlieder;T. Barclay;B. Hord;W. Jao;E. Vrijmoet;T. Henry;R. Cloutier;V. Ko

The Solar Neighborhood. XLIX. New Discoveries and Orbits of M-dwarf Multiples with Speckle Interferometry at SOAR

• DOI: 10.3847/1538-3881/ac52f6
• 发表时间: 2022-02
• 期刊: The Astronomical Journal
• 作者: E. Vrijmoet;A. Tokovinin;T. Henry;J. Winters;E. Horch;W. Jao

Speckle Interferometry at SOAR in 2020

2020 年 SOAR 散斑干涉测量

• DOI: 10.3847/1538-3881/ac00bd
• 发表时间: 2021
• 期刊: The Astronomical Journal
• 作者: Tokovinin, Andrei;Mason, Brian D.;Mendez, Rene A.;Costa, Edgardo;Mann, Andrew W.;Henry, Todd J.
• 通讯作者: Henry, Todd J.