TESS Asteroseismic Analysis of the Known Exoplanet Host Star HD 222076
TESS Asteroseismic Analysis of the Known Exoplanet Host Star HD 222076
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已知系外行星主星 HD 222076 的 TESS 星震分析
DOI：
10.3847/1538-4357/ab8f29
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发表时间：
2020
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通讯作者：
e
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作者：
Jiang Chen;Bedding Timothy R.;Stassun Keivan G.;Veras Dimitri;Corsaro Enrico;Buzasi Derek L.;Mikoajczyk Przemysaw;Zhang Qian-sheng;Ou Jian-wen;Campante Tiago L.;Rodrigues Thaise S.;Nsamba Benard;Bossini Diego;Kane Stephen R.;Joel Ong Jia Mian;Yldz Mutlu;e
凌日系外行星巡天卫星（TESS）是一个全天巡天使命，旨在寻找凌日明亮恒星的系外行星。TESS的高质量测光数据对于类太阳恒星的星震研究是极好的。在这项工作中，我们提出了一个红巨星星星HD 222076托管长周期（2.4年）通过径向速度发现的巨行星的星震分析。TESS首次探测到HD 222076在203 μHz附近的类太阳振荡。使用全球星震参数作为输入的星震建模，产生了恒星质量（）、半径（）和年龄（7.4 ± 2.7 Gyr）的测定结果，与以前的研究相比，精度大大提高。从观测到的功率谱中提取的偶极混合模的周期间隔揭示了该星星位于红巨星分支上，在围绕核心的壳层中燃烧氢。我们发现，这颗行星将无法逃脱星星的潮汐引力，在到达红巨星分支的尖端之前，它将在大约8亿年内被吞没。
The Transiting Exoplanet Survey Satellite (TESS) is an all-sky survey mission aiming to search for exoplanets that transit bright stars. The high-quality photometric data of TESS are excellent for the asteroseismic study of solar-like stars. In this work, we present an asteroseismic analysis of the red-giant star HD 222076 hosting a long-period (2.4 yr) giant planet discovered through radial velocities. Solar-like oscillations of HD 222076 are detected around 203 μHz by TESS for the first time. Asteroseismic modeling, using global asteroseismic parameters as inputs, yields a determination of the stellar mass ( ), radius ( ), and age (7.4 ± 2.7 Gyr), with precisions greatly improved from previous studies. The period spacing of the dipolar mixed modes extracted from the observed power spectrum reveals that the star is on the red-giant branch burning hydrogen in a shell surrounding the core. We find that the planet will not escape the tidal pull of the star and will be engulfed into it within about 800 Myr, before the tip of the red-giant branch is reached.