围绕TOI-125的三颗迷你海王星的质量测定
地球与行星天体物理
2020-01-27 v1 太阳与恒星天体物理
摘要
凌星系外行星巡天卫星（TESS）目前正在对亮星周围的小行星进行全天搜寻。在TESS巡天的第一年，在实现其确立50颗小于海王星行星的整体密度这一主要科学目标方面取得了稳步进展。该年TESS的观测聚焦于南黄道半球，从而发现了围绕V=11.0的K0型矮星TOI-125运行的三颗迷你海王星。我们给出了密集的HARPS视向速度观测，得到了TOI-125b、TOI-125c和TOI-125d的精确质量测量。TOI-125b的轨道周期为4.65天，半径为，质量为，且接近与周期为9.15天的TOI-125c的2:1平运动共振。TOI-125c具有相似的半径和质量，是三颗行星中最蓬松的。TOI-125d的轨道周期为19.98天，半径为，质量为。对于TOI-125b和TOI-125d，我们发现异常高的偏心率，分别为和。我们的分析还给出了系统中两个低信噪比行星候选体的质量上限；对于TOI-125.04（，0.53天），我们得到质量上限为，而TOI-125.05（，13.28天）不太可能是可行的行星候选体，其质量上限为。我们讨论了三颗已确认行星的内部结构，以及这一引人入胜的系外行星系统的动力学稳定性与系统构型。
引用
@article{arxiv.2001.08834,
title = {Mass determinations of the three mini-Neptunes transiting TOI-125},
author = {L. D. Nielsen and D. Gandolfi and D. J. Armstrong and J. S. Jenkins and M. Fridlund and N. C. Santos and F. Dai and V. Adibekyan and R. Luque and J. H. Steffen and M. Esposito and F. Meru and S. Sabotta and E. Bolmont and D. Kossakowski and J. F. Otegi and F. Murgas and M. Stalport and F. ~Rodler and M. R. Díaz and N. T. ~Kurtovic and G. Ricker and R. Vanderspek and D. W. Latham and S. Seager and J. N. Winn and J. M. Jenkins and R. Allart J. M. ~Almenara D. Barrado and S. C. C. Barros and D. Bayliss and Z. M. Berdiñas and I. Boisse and F. Bouchy and P. Boyd and D. J. A. Brown and E. M. Bryant and C. Burke and W. D. Cochran and B. F. Cooke and O. D. S. Demangeon and R. F. Díaz and J. Dittman and C. Dorn and X. Dumusque and R. A. García and L. González-Cuesta and S. Grziwa and I. Georgieva and N. Guerrero and A. P. Hatzes and R. Helled and C. E. Henze and S. Hojjatpanah and J. Korth and K. W. F. ~Lam and J. ~Lillo-Box and T. A. Lopez and J. Livingston and S. Mathur and O. Mousis and N. Narita and H. P. Osborn and E. Palle and P. A. Peña Rojas and C. M. ~Persson and S. N. Quinn and H. Rauer and S. Redfield and A. ~Santerne and L. A. dos Santos and J. V. Seidel and S. G. Sousa and E. B. Ting and M. Turbet and S. Udry and A. Vanderburg and V. Van Eylen and J. I. Vines and P. J. Wheatley and P. A. Wilson},
journal= {arXiv preprint arXiv:2001.08834},
year = {2020}
}
备注
Accepted for publication in MNRAS