JWST NIRISS孔径掩模干涉测量揭示的HR 8799系统中一颗候选最内层第五行星
A Candidate Innermost Fifth Planet In the HR 8799 System Revealed By JWST NIRISS Aperture Masking Interferometry
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中文总结 AI 辅助
利用JWST/NIRISS AMI新数据处理流程,在HR 8799系统探测到一颗候选第五行星,若确认将使其成为首个直接成像的五行星系统。
中文摘要 AI 辅助
我们在HR 8799系统中探测到一颗候选第五行星,该行星通过JWST/NIRISS孔径掩模干涉仪(AMI)直接成像。探测到的源在F380M滤光片下,投影间距约为150毫角秒,对比度约为2×10⁻⁴,刚好位于3σ对比度曲线上方,对应一颗质量约为几个至数个木星质量、轨道半径约为7天文单位的行星。该候选体的间距与盖亚(Gaia)和依巴谷(Hipparcos)卫星的绝对自行约束相符(假设其受引力束缚),而其轨道位置接近一颗与行星e处于3:1平均运动共振的第五行星的稳定轨道解。这一探测得益于新的JWST/NIRISS AMI数据处理流程,该流程通过考虑先前分析中限制灵敏度的光学和电子系统效应,达到了AMI的光子噪声极限潜力。该候选体的确认将使HR 8799成为首个直接成像的五行星系统,并为广泛分离的气态巨行星系统的轨道动力学和动力学演化提供见解。
英文摘要
We detect a candidate fifth planet in the HR 8799 system, directly imaged with the JWST/NIRISS Aperture Masking Interferometer (AMI). The detected source lies just above a $3σ$ contrast curve at a contrast of $\sim2\times10^{-4}$ in the F380M filter at a projected separation of $\sim150$ mas, corresponding to a few-to-several Jupiter mass planet at an orbital radius of $\sim 7$au. The separation of the candidate is compatible with absolute proper-motion constraints from Gaia and Hipparcos assuming it is bound, while its orbital position lies near a stable orbital solution of a fifth planet in a 3:1 mean motion resonance with planet e. This detection was made possible by a new JWST/NIRISS AMI data pipeline that reaches the photon noise limited potential of AMI by accounting for the optical and electronic systematics that limited sensitivity in prior analyses. Confirmation of this candidate would make HR 8799 the first directly imaged five-planet system and provide insight into the orbital dynamics and the dynamical evolution of planetary systems with widely-separated gas giants.
发表机构
- University of California, San Diego(加州大学圣迭戈分校)
- Leiden Observatory(莱顿天文台)
- IPAC, Caltech(加州理工学院IPAC)
- Macquarie University(麦考瑞大学)
- University of Sydney(悉尼大学)
- University of Victoria(维多利亚大学)
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