AI 中文总结
本研究重新评估两颗食双星CH Ind和SW CMa的近点运动，发现其恒星贡献可解释观测结果，表明环双星行星候选体需先经目标特定双星模型验证，才能归因于第三体效应。
AI 中文摘要
Thornton等人（2026）从TESS食双星计时的过量近点运动中报告了27个非凌日环双星行星候选体。经典恒星贡献对目标特定的半径、近点常数k2和自转敏感。我们重新评估该样本中的两颗演化的双谱食双星：脉动系统CH Ind和Am型恒星SW CMa。它们的组分质量和半径已在专门的双星研究中测得，使得可直接计算恒星贡献。对于CH Ind，六个独立的TESS天区节点给出观测近点运动速率ω̇obs=1.82+0.99−0.94×10−3度/周期，而对测得的双星组分的同期拟合预测恒星贡献的近点运动速率ω̇stars=2.05+0.43−0.34×10−3度/周期。对于SW CMa，其测得的尺寸使经典项增大约16倍；已发表的目标特定预测值为0.670±0.020×10−3度/周期，与观测值0.690±0.050×10−3度/周期相符。两颗系统均未显示出显著的过量顺行分量。该比较表明，来自大规模搜索的候选体在被归因于第三体解释之前，需要目标特定的双星模型。
英文摘要
Thornton et al. (2026) reported 27 non-transiting circumbinary-planet candidates from excess apsidal motion in TESS eclipsing-binary timings. The classical stellar contribution is sensitive to target-specific radii, apsidal constants $k_2$, and rotation. We re-evaluate two evolved, double-lined eclipsing binaries in that sample: the pulsating system CH Ind and the Am system SW CMa. Their component masses and radii have been measured in dedicated binary studies, allowing the stellar contribution to be calculated directly. For CH Ind, six independent TESS sector nodes give $\dotω_{\rm obs}=1.82^{+0.99}_{-0.94}\times10^{-3}\ {\rm deg\,cycle^{-1}}$, while a coeval fit to the measured binary components predicts $\dotω_{\rm stars}=2.05^{+0.43}_{-0.34}\times10^{-3}\ {\rm deg\,cycle^{-1}}$. For SW CMa, its measured dimensions raise the classical term by a factor of about 16; the published target-specific prediction, $0.670\pm0.020\times10^{-3}\ {\rm deg\,cycle^{-1}}$, agrees with the observed $0.690\pm0.050\times10^{-3}\ {\rm deg\,cycle^{-1}}$. Neither system shows a significant excess prograde component. The comparison shows that candidates from a bulk search require target-specific binary models before a third-body interpretation is assigned.
Comments5 pages, 3 figures, plus 5 pages of Supporting Information with 3 additional figures. Data and code: https://doi.org/10.5281/zenodo.21919189
