GALAH调查：利用银河系考古学来完善我们对TESS目标恒星的认识
The GALAH Survey: Using Galactic Archaeology to Refine our Knowledge of TESS Target Stars
摘要：
凌日系外行星调查卫星（TESS）正在发现数量空前的系外行星。确定这些系外行星的轨道参数，特别是它们的质量和半径，将在很大程度上取决于它们的宿主恒星的测量物理特性。我们有来自GALAH数据发布2，TESS输入目录和盖亚数据发布2的交叉匹配光谱，光度和天体测量数据，为47，285颗恒星创建一个精心策划的，自洽的物理和化学性质目录。利用这些数据，我们推导出等时线质量和半径，精确到5%以内。我们已经修改了三个已确认的和十二个候选的TESS行星系的参数。这些结果对CTOI-20125677是否确实是一个行星系产生了怀疑，因为修正后的行星半径现在与恒星的大小相当。我们的GALAH-TESS目录包含多达23种元素的丰度。我们特别分析了C/O，Mg/Si，Fe/Si和Fe/Mg的摩尔比，以帮助确定行星的组成和结构与$R_p < 4R_\oplus$。从这些比率来看，36%落在太阳/地球值的2 sigma范围内，这表明这些恒星可能拥有岩石系外行星，其地质成分类似于我们自己的太阳系中发现的行星。
英文摘要：
An unprecedented number of exoplanets are being discovered by the Transiting Exoplanet Survey Satellite (TESS). Determining the orbital parameters of these exoplanets, and especially their mass and radius, will depend heavily upon the measured physical characteristics of their host stars. We have cross-matched spectroscopic, photometric, and astrometric data from GALAH Data Release 2, the TESS Input Catalog and Gaia Data Release 2, to create a curated, self-consistent catalog of physical and chemical properties for 47,285 stars. Using these data we have derived isochrone masses and radii that are precise to within 5\%. We have revised the parameters of three confirmed, and twelve candidate, TESS planetary systems. These results cast doubt on whether CTOI-20125677 is indeed a planetary system since the revised planetary radii are now comparable to stellar sizes. Our GALAH-TESS catalog contains abundances for up to 23 elements. We have specifically analysed the molar ratios for C/O, Mg/Si, Fe/Si and Fe/Mg, to assist in determining the composition and structure of planets with $R_p < 4R_\oplus$. From these ratios, 36% fall within 2 sigma of the Sun/Earth values, suggesting that these stars may host rocky exoplanets with geological compositions similar to planets found within our own Solar system.
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