适居世界天文台目标恒星的光谱能量分布分析
Spectral Energy Distribution Analysis for Habitable Worlds Observatory Target Stars
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中文总结 AI 辅助
本研究针对HWO ExEP列表的164颗目标恒星开展SED分析，拟合Pickles光谱模板得到$F_\text{bol}$等参数，发现部分恒星温度偏差，成果为HWO相关研究提供统一恒星参数。
中文摘要 AI 辅助
适居世界天文台（HWO）将直接成像并表征围绕近邻恒星运行的可能与地球相似的行星。准确的恒星属性，尤其是有效温度（$T_\text{eff}$）、角直径（$\theta_\text{*}$）和热通量（$F_\text{bol}$），对于可靠的适居带（HZ）计算、系外行星产量预测以及日冕仪设计权衡研究至关重要。我们针对HWO系外行星探索计划（ExEP）列表中的164颗恒星开展光谱能量分布（SED）分析，利用Pickles恒星光度通量库中的经验光谱模板对宽带测光数据进行$\boldsymbol{\text{χ}^2}$最小化拟合。SED拟合可直接测量$F_\text{bol}$。对于164颗恒星中的127颗，我们采用PASTEL星表中的光谱学$T_\text{eff}$值，其余恒星则取自HWO ExEP星表，并结合这些值与$F_\text{bol}$，通过斯特藩-玻尔兹曼方程计算$\theta_\text{*}$。作为一致性检验，我们将Pickles模板的$T_\text{eff}$与所采用的光谱学值进行比较，发现样本中65%的恒星二者吻合度在约3%以内，且模板存在系统性地得出更低温度值的倾向。我们识别出48颗偏差超过200开尔文的恒星，其中包括测光污染影响SED解的密近双星系统。我们探讨了该研究对适居带边界计算、直接成像行星的大气反演以及HWO目标优先级排序的意义。这份SED星表为HWO目标样本提供了一套统一的、经经验确定的$F_\text{bol}$值及相关恒星参数。
英文摘要
The Habitable Worlds Observatory (HWO) will directly image and characterize planets potentially similar to Earth orbiting nearby stars. Accurate stellar properties, particularly effective temperatures ($T_\mathrm{eff}$), angular diameters ($θ_\star$), and bolometric fluxes ($F_\mathrm{bol}$), are essential for reliable Habitable Zone (HZ) calculations, exoplanet yield predictions, and coronagraph design trade studies. We present a spectral energy distribution (SED) analysis for the 164 stars from the HWO Exoplanet Exploration Program (ExEP) list, using $χ^2$-minimization fits of empirical spectral templates from the Pickles stellar spectral flux library to broadband photometric data. The SED fits provide direct measurements of $F_\mathrm{bol}$. We adopt spectroscopic $T_\mathrm{eff}$ values from the PASTEL catalog for 127 of the 164 stars, with the remainder drawn from the HWO ExEP catalog, and use these in combination with $F_\mathrm{bol}$ to calculate $θ_\star$ via the Stefan-Boltzmann equation. As a consistency check, we compare the Pickles template $T_\mathrm{eff}$ with the adopted spectroscopic values and find agreement to within $\sim$3% for 65% of the sample, with a systematic tendency for the templates to yield cooler values. We identify 48 stars with discrepancies exceeding 200~K, including close binary systems where photometric contamination compromises the SED solution. We discuss the implications for HZ boundary calculations, atmospheric retrieval of directly imaged planets, and target prioritization for HWO. This SED catalog constitutes a uniform set of empirically determined $F_\mathrm{bol}$ values and associated stellar parameters for the HWO target sample.
