论文标题
Apogee DR17中感兴趣的开普勒对象的元素丰度
Elemental Abundances of Kepler Objects of Interest in APOGEE DR17
论文作者
论文摘要
行星宿主恒星的元素丰度可以阐明行星形成环境的条件。我们测试了Apogee中130个已知/候选行星宿主的单个丰度在统计学上与参考Doppelganger样品的单个丰度不同。参考集包含使用相同的TEFF，Logg，[Fe/H]和[mg/h]作为每个关注的对象（KOI）选择的对象。我们预测使用这四个参数的局部线性模型训练Aspcap丰度测量值的局部线性模型，预测KOI及其多皮特格朗格的十二个个人丰度（X = C，N，O，Na，al，si，ca，ti，ca，ti，ti，v，cr，mn，mn，mn，mn，ni）及其多发性群体的训练，以对具有高尺尺的田间星星进行测量。我们比较了两个样本的元素预测残差（模型测量），并在选择高质量的样本中发现它们是无法区分的。对于这些元素，我们报告了分别为KOI和Doppelganger样品的中位固有分散剂和〜0.041 dex的中位数。我们得出的结论是，固定的Teff，Logg，[Fe/H]和[mg/h]的单个丰度对于已知的行星宿主来说是无常见的。我们的结果建立了对揭示行星宿主星星中行星形成的任何化学特征所需的丰度精度的上限。
The elemental abundances of planet host stars can shed light on the conditions of planet forming environments. We test if individual abundances of 130 known/candidate planet hosts in APOGEE are statistically different from those of a reference doppelganger sample. The reference set comprises objects selected with the same Teff, logg, [Fe/H], and [Mg/H] as each Kepler Object of Interest (KOI). We predict twelve individual abundances (X = C, N, O, Na, Al, Si, Ca, Ti, V, Cr, Mn, Ni) for the KOIs and their doppelgangers using a local linear model of these four parameters, training on ASPCAP abundance measurements for a sample of field stars with high fidelity (SNR > 200) APOGEE observations. We compare element prediction residuals (model-measurement) for the two samples and find them to be indistinguishable, given a high quality sample selection. We report median intrinsic dispersions of ~0.038 dex and ~0.041 dex, for the KOI and doppelganger samples, respectively, for these elements. We conclude that the individual abundances at fixed Teff, logg, [Fe/H], and [Mg/H] are unremarkable for known planet hosts. Our results establish an upper limit on the abundance precision required to uncover any chemical signatures of planet formation in planet host stars.
