发表机构
CAS Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences; Division of Space Research and Planetary Sciences, Physics Institute, University of Bern; School of Astronomy and Space Science, University of Science and Technology of China; CAS Center for Excellence in Comparative Planetology（中国科学院行星科学重点实验室，紫金山天文台; 伯尔尼大学物理研究所空间研究与行星科学系; 中国科学技术大学天文与空间科学学院; 中国科学院比较行星学卓越中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用改进的MCMC框架对密近双星中40颗S型单行星进行N体动力学质量测定，揭示恒星伴星摄动对行星质量推断的偏差规律，为亚木星沙漠的形成提供了观测约束。
AI 中文摘要
从盖亚（Gaia）和凌日系外行星巡天卫星（TESS）的观测中，已发现700余颗S型行星，其中包含150余颗凌日目标，这使得在双星环境下开展精确的动力学轨道与行星质量表征成为可能。本文首次采用改进的马尔可夫链蒙特卡洛（MCMC）框架，结合高斯先验模型恒星伴星的摄动，对密近双星中的40颗S型（卫星型轨道）单行星进行了系统的N体动力学质量测定。对于半长轴a_B<100天文单位的双星系统，伴星引起的摄动会偏移视向速度（RV）半振幅，进而影响推断出的行星质量。该影响对短周期亚木星行星最为显著，当从开普勒模型转换为N体模型时，其质量最多降低20%；而质量在木星质量（M_Jup）到5倍木星质量之间的大质量木星行星，仅表现出7.2%的质量降低。将非轴对称快速傅里叶变换（NAFF）稳定性准则应用于TOI-4633系统，互倾角i_mut=70°是快速排除不稳定轨道解的上限。我们的结果表明，中等质量行星在推断质量中表现出正或负偏差，并对观测到的亚木星沙漠分布产生影响。
英文摘要
More than 700 S-type planets have been identified from Gaia and TESS observations, including over 150 transiting targets, enabling the precise dynamical orbits and planetary mass characterization in binary environments. Here we present the first systematic N-body dynamical mass determination for 40 single S-type (Satellite-type orbit) planets in close binaries using an improved Markov Chain Monte Carlo (MCMC) framework with Gaussian priors to model stellar companion perturbations. {For binary systems with $a_\mathrm{B}<100$ au, companion-induced perturbations can bias the RV semi-amplitude and consequently the inferred planetary masses. The impact is strongest for short-period sub-Jovian planets, whose masses decrease by up to 20% when transitioning from Keplerian to N-body modeling, while massive Jovian planets with $M_{\mathrm{Jup}} < M_{\mathrm{p}} < 5$ $M_{\mathrm{Jup}}$ show only a 7.2% reduction.} Applying the NAFF stability criterion to TOI-4633, $i_{\mathrm{mut}} = 70^{\circ}$ is the upper limit for the fast rejection of unstable orbital solutions. Our results reveal that intermediate-mass planets exhibit both positive or negative biases in the inferred masses and influence the observed population of the sub-Jovian desert.
Comments24 pages, 13 figures, accepted for publication in ApJS
