Streamers: Funneling Material from Envelopes to the Youngest Planet-forming Disks

流光：将物质从包层输送到最年轻​​的行星形成盘

• 批准号: 2102405
• 负责人: Dominique Segura-Cox
• 金额: $ 30万
• 依托单位: Segura-Cox Dominique M
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-10-01 至 2024-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2102405&HistoricalAwards=false
• 关键词: Streamers; Funneling; Material; Envelopes; Youngest

This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2). Dominique Segura-Cox is awarded an NSF Astronomy and Astrophysics Postdoctoral Fellowship to conduct a program of research and education at the University of Texas. Segura-Cox will observationally explore the properties of “streamers” – long, thin funnels connecting material between the natal envelopes and disks of young protostars – and compare the observations with simulations of mass accretion in protostars. Results from this study will allow astronomers to understand how material is accreted onto protostars and what role streamers play in the early stages of star and planet formation. For the education component of this project, Segura-Cox will develop an astronomy-themed seminar series for middle school and high school teachers in rural and socioeconomically disadvantaged communities.This project will conduct radio interferometric observations of asymmetric streamers to study their chemical composition, occurrence, and from how far away they accrete material into planet-forming disks. By measuring the chemical composition of the streamers and comparing it to exoplanet compositions, the likelihood of streamer material being directly incorporated into planets will be assessed. Using ongoing surveys, the proportion of protostars with streamers will be systematically determined to assess whether streamers are a common mass-accretion pathway for planet-forming disks. Using follow-up observations, the full extent of streamers from clouds to disks will be determined. Comparing observations with simulations will permit determination of mass infall rates, magnetic field strengths, and streamer chemical evolution with time.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.

该奖项全部或部分根据2021年美国救援计划法案（公法117-2）资助。Dominique Segura-Cox被授予NSF天文学和天体物理学博士后奖学金，在德克萨斯大学进行研究和教育计划。 Segura-Cox将观测探索“流光”的特性-连接年轻原恒星的纳塔尔信封和圆盘之间的材料的细长漏斗-并将观测结果与原恒星中质量吸积的模拟进行比较。 这项研究的结果将使天文学家了解物质是如何吸积到原恒星上的，以及流光在星星和行星形成的早期阶段扮演什么角色。 关于该项目的教育部分，塞古拉-考克斯将为农村和社会经济条件不利的社区的初中和高中教师举办一系列以天文学为主题的研讨会，该项目将对非对称飘带进行无线电干涉观测，以研究其化学成分、出现情况以及它们在多远的距离内将物质吸积成行星形成盘。 通过测量拖缆的化学成分并将其与系外行星的成分进行比较，将评估拖缆材料直接并入行星的可能性。利用正在进行的调查，将系统地确定有流光的原恒星的比例，以评估流光是否是行星形成盘的常见质量吸积路径。 利用后续观测，将确定从云到盘的拖缆的全部范围。 将观测结果与模拟结果进行比较，可以确定质量下落率、磁场强度和流注化学随时间的演化。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

An Interferometric View of H-MM1. I. Direct Observation of NH 3 Depletion

H-MM1 的干涉视图。

• DOI: 10.3847/1538-3881/ac6be7
• 发表时间: 2022
• 期刊: The Astronomical Journal
• 作者: Pineda, Jaime E.;Harju, Jorma;Caselli, Paola;Sipilä, Olli;Juvela, Mika;Vastel, Charlotte;Rosolowsky, Erik;Burkert, Andreas;Friesen, Rachel K.;Shirley, Yancy
• 通讯作者: Shirley, Yancy

PRODIGE – envelope to disk with NOEMA: I. A 3000 au streamer feeding a Class I protostar

PRODIGE — 使用 NOEMA 将信封传输至磁盘：I. 一条 3000 au 的流光为 I 级原恒星供电

• DOI: 10.1051/0004-6361/202243310
• 发表时间: 2022
• 期刊: Astronomy & Astrophysics
• 影响因子: 6.5
• 作者: Valdivia-Mena, M. T.;Pineda, J. E.;Segura-Cox, D. M.;Caselli, P.;Neri, R.;López-Sepulcre, A.;Cunningham, N.;Bouscasse, L.;Semenov, D.;Henning, Th.
• 通讯作者: Henning, Th.

Dust Hot Spots at 10 au Scales around the Class 0 Binary IRAS 16293–2422 A: A Departure from the Passive Irradiation Model

• DOI: 10.3847/2041-8213/aca53a
• 发表时间: 2022-12
• 期刊: The Astrophysical Journal Letters
• 作者: M. Maureira;M. Gong;J. Pineda;H. Liu;Kedron Silsbee;P. Caselli;J. Zamponi;D. Segura-Cox;A. Schmiedeke

PRODIGE – envelope to disk with NOEMA: II. Small-scale temperature structure and streamer feeding the SVS13A protobinary based on CH 3 CN and DCN

PRODIGE — 使用 NOEMA 信封到磁盘：II。

• DOI: 10.1051/0004-6361/202244183
• 发表时间: 2023
• 期刊: Astronomy & Astrophysics
• 影响因子: 6.5
• 作者: Hsieh, T.-H.;Segura-Cox, D. M.;Pineda, J. E.;Caselli, P.;Bouscasse, L.;Neri, R.;Lopez-Sepulcre, A.;Valdivia-Mena, M. T.;Maureira, M. J.;Henning, Th.
• 通讯作者: Henning, Th.

SOLIS: XVI. Mass ejection and time variability in protostellar outflows: Cep E

索利斯：十六。

• DOI: 10.1051/0004-6361/202142931
• 发表时间: 2022
• 期刊: Astronomy & Astrophysics
• 影响因子: 6.5
• 作者: de A. Schutzer, A.;Rivera-Ortiz, P. R.;Lefloch, B.;Gusdorf, A.;Favre, C.;Segura-Cox, D.;López-Sepulcre, A.;Neri, R.;Ospina-Zamudio, J.;De Simone, M.
• 通讯作者: De Simone, M.