ARMADA: A Unique Hunt for Exoplanets and Low-Mass Companions around Hot Stars

ARMADA：对热恒星周围系外行星和低质量伴星的独特搜寻

• 批准号: 2009489
• 负责人: John Monnier
• 金额: $ 37.31万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-08-01 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2009489&HistoricalAwards=false
• 关键词: ARMADA; Unique; Hunt; Exoplanets; Low

Most known exoplanets have been discovered either through the decrease in starlight when planets transit in front of a star (from our perspective) or through Doppler wavelength shifts in the stellar spectrum. This team will apply a completely different method: imaging a star to determine its wobble due to the tug of a planet as it orbits. The team will use the CHARA and ESO’s VLTI optical interferometry arrays to observe 70 different binary star systems. This is a population of exoplanets that is unlikely to be detectable with other methods. This program will provide the basis for a graduate student to complete a PhD thesis. The team will conduct novel outreach activities through a traveling display in rural Michigan and at NASCAR events.The team will conduct a survey of 70 binary hot star (mass 1 solar mass) systems to search for massive exoplanets and companion brown dwarfs at orbits of approximately 1 AU. This ARMADA survey will use optical interferometry with the CHARA array in the Northern Hemisphere and ESO’s VLTI array in the Southern Hemisphere to detect stellar wobble due to orbiting massive exoplanets. Their survey will include different separation distances between binary stars in order to examine how binarity might suppress or enhance planet formation as a function of stellar separation of the pair. They will also survey trinary systems for potential exoplanet and low-mass brown dwarf companions.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.

大多数已知的系外行星都是通过行星在恒星前面运行时星光的减少（从我们的角度来看）或通过恒星光谱中的多普勒波长移动发现的。这个团队将采用一种完全不同的方法：对一颗恒星进行成像，以确定它在运行过程中由于行星的牵引而产生的摆动。该团队将使用CHARA和ESO的VLTI光学干涉测量阵列来观察70个不同的双星系统。这是一群用其他方法不太可能探测到的系外行星。该课程将为研究生完成博士论文提供基础。该团队将通过在密歇根州农村和纳斯卡赛事的巡回展示来开展新颖的推广活动。该团队将对70个双热星（质量为太阳质量的1倍）系统进行调查，以寻找大约1天文单位轨道上的大质量系外行星和伴星棕矮星。这次ARMADA调查将使用北半球的CHARA阵列和南半球的ESO VLTI阵列的光学干涉测量来探测由于绕轨道运行的大质量系外行星而产生的恒星摆动。他们的调查将包括双星之间不同的分离距离，以研究双星是如何抑制或增强行星形成的，作为这对恒星分离的函数。他们还将调查三联系系统，寻找潜在的系外行星和低质量褐矮星伴星。该奖项反映了美国国家科学基金会的法定使命，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

Interferometric Detections of sdO Companions Orbiting Three Classical Be Stars

• DOI: 10.3847/1538-4357/ac4266
• 发表时间: 2021-12
• 期刊: The Astrophysical Journal
• 作者: R. Klement;G. Schaefer;D. Gies;L. Wang;D. Baade;T. Rivinius;A. Gallenne;A. Carciofi;J. Monnier;A. M'erand;N. Anugu;S. Kraus;C. Davies;C. Lanthermann;T. Gardner;P. Wysocki;J. Ennis;A. Labdon;B. Setterholm;J. L. Bouquin

Establishing α Oph as a Prototype Rotator: Precision Orbit with New Keck, CHARA, and RV Observations

建立 α Oph 作为原型旋转器：具有新 Keck、CHARA 和 RV 观测的精密轨道

• DOI: 10.3847/1538-4357/ac1172
• 发表时间: 2021
• 期刊: The Astrophysical Journal
• 作者: Gardner, Tyler;Monnier, John D.;Fekel, Francis C.;Williamson, Michael;Baron, Fabien;Hinkley, Sasha;Ireland, Michael;Kraus, Adam L.;Kraus, Stefan;Roettenbacher, Rachael M.
• 通讯作者: Roettenbacher, Rachael M.

A thesis to probe unique exoplanet regimes with micro-arcsecond astrometry and precision closure phases at CHARA and VLTI

一篇利用 CHARA 和 VLTI 的微弧秒天体测量和精确闭合相位探测独特系外行星状态的论文

• DOI: 10.1117/12.2630035
• 发表时间: 2022
• 期刊: Proceedings of the SPIE
• 作者: Gardner, Tyler;Monnier, John D.;Fekel, Francis C.;Le Bouquin, Jean-Baptiste;Scovera, Adam;Schaefer, Gail;Kraus, Stefan;Adams, Fred C.;Anugu, Narsireddy;Beltz, Hayley
• 通讯作者: Beltz, Hayley

Direct discovery of the inner exoplanet in the HD 206893 system: Evidence for deuterium burning in a planetary-mass companion

HD 206893系统中直接发现内系外行星：行星质量伴星中氘燃烧的证据

• DOI: 10.1051/0004-6361/202244727
• 发表时间: 2023
• 期刊: Astronomy & Astrophysics
• 影响因子: 6.5
• 作者: Hinkley, S.;Lacour, S.;Marleau, G.-D.;Lagrange, A.-M.;Wang, J. J.;Kammerer, J.;Cumming, A.;Nowak, M.;Rodet, L.;Stolker, T.
• 通讯作者: Stolker, T.

ARMADA. II. Further Detections of Inner Companions to Intermediate-mass Binaries with Microarcsecond Astrometry at CHARA and VLTI

• DOI: 10.3847/1538-3881/ac8eae
• 发表时间: 2022-09
• 期刊: The Astronomical Journal
• 作者: T. Gardner;J. Monnier;F. Fekel;J. L. Bouquin;Adam Scovera;G. Schaefer;S. Kraus;F. Adams;N. Anugu;J. Berger;T. Brummelaar;C. Davies;J. Ennis;D. Gies;K. Johnson;P. Kervella;K. Kratter;A. Labdon;C. Lanthermann;J. Sahlmann;Benjamin R. Setterholm Univ. of Michigan;Tennessee State University;U. G. Alpes;The Chara Array;U. Exeter;U. Michigan;U. Wisconsin;O. Paris;U. Arizona;E. Observatory;European Space Astronomy Center