发表机构
Embry-Riddle Aeronautical University; Northwestern University; The University of Alabama（埃姆布里-阿瑟航空大学; 西北大学; 阿拉巴马大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究使用BASE-9代码对146颗主星周围149颗宜居带行星的主星年龄进行精确约束，追踪宜居带迁移以确定后续高分辨率表征的理想目标，为行星宜居性演化研究提供支撑。
AI 中文摘要
精确的恒星年龄是解释宜居带（HZ）行星演化历史的基础。由于恒星光度随时间演化，宜居带边界会向外迁移，这意味着现今的宜居带行星在其演化早期可能经历过不同的辐射环境。因此需要精确的年龄来估算宜居带停留时间，并将行星宜居性置于演化背景中。我们使用包含九个参数的恒星演化贝叶斯分析代码（BASE-9），对拥有宜居带行星的系外行星主星的年龄和质量进行约束。我们的样本包含有效温度为4475-7200K的单星，这些恒星拥有位于其计算得出的宜居带边界内的行星。我们将等时线与盖亚DR3、Pan-STARRS和2MASS的宽带测光数据，以及盖亚视差、光谱金属丰度和消光估计值进行联合拟合，并评估所得的年龄后验分布。利用这些年龄约束，我们沿恒星演化序列追踪宜居带迁移，以估算连续的宜居带停留时间，从而确定后续高分辨率表征的理想目标。由于等时线在主序拐点附近及之外的分离最为明显，我们的分析重点关注演化态恒星和拐点恒星，BASE-9在这些恒星上能产生最严格的约束。我们量化了样本中的年龄精度，为亚巨星、演化态主序星或拐点恒星提供了高精度年龄，而对主序下方的主序星，年龄精度较低但可测量。最终星表提供了我们对146颗主星周围149颗宜居带行星的年龄约束，并支持对行星历史的演化解释。
英文摘要
Accurate stellar ages are fundamental to interpreting the evolutionary histories of habitable zone (HZ) planets. Because stellar luminosity evolves over time, HZ boundaries migrate outward, meaning that present-day HZ planets may have experienced different irradiation environments earlier in their evolution. Accurate ages are therefore required to estimate HZ residence times and place planetary habitability in an evolutionary context. We use the Bayesian Analysis of Stellar Evolution with nine parameters (BASE-9) code to constrain ages and masses for exoplanet host stars with planets located in the HZ. Our sample includes single stars with effective temperatures of 4475-7200 K that host planets within their calculated HZ boundaries. We fit isochrones to broadband photometry from Gaia DR3, Pan-STARRS, and 2MASS jointly with Gaia parallaxes, spectroscopic metallicities, and extinction estimates, and assess the resulting age posterior distributions. Using these age constraints, we track HZ migration along stellar evolutionary sequences to estimate continuous HZ residence times, allowing us to identify ideal targets for followup high resolution characterization. Because isochrones separate most strongly near and beyond the main-sequence turnoff, our analysis emphasizes evolved and turnoff hosts, where BASE-9 produces the tightest constraints. We quantify age precision across the sample, yielding highly precise ages for subgiants and evolved main-sequence or turnoff stars, and less precise but measurable ages for lower main-sequence hosts. The final catalog provides our age constraints for 149 HZ planets around 146 host stars and supports evolutionary interpretations of planetary histories.
CommentsAccepted for publication in ApJ, 26 pages, 11 figures
