多行星系统TOI-5624：四颗横行次亚海星行星及外围伴侣通过通讯时变变动揭示
摘要
在2022年的TESS目标事件中，发现TOI-5624（距离约100 pc的G7星）出现横行现象。2023年的CHEOPS任务检测到四个行星信号，分别为P_b≈3.4、P_c≈7.9、P_d≈13.7和P_e≈21.5天，随后通过2024-2025年的额外TESS和CHEOPS光度测量得到确认。对TESS与CHEOPS光度数据进行分析后，我们提取并对HARPS-N与SOPHIE RV时间序列进行建模，使用两种独立的方法均基于MCMC框架。我们进一步集成运动方程，同时拟合通讯时刻和detrended RV，以动态特征 characterize该系统。我们发现四颗横行次亚海星行星，其半径分别为R_b=2.314±0.035 R_⊕、R_c=2.474±0.042 R_⊕、R_d=3.584_{-0.050}^{+0.051} R_⊕和R_e=3.247_{-0.043}^{+0.042} R_⊕，质量分别为M_b=9.4±1.4 M_⊕、M_c=4.8±1.9 M_⊕、M_d=4.9±2.2 M_⊕和M_e=8.9_{-3.0}^{+2.9} M_⊕。我们的光度分析显示，最外层横行行星TOI-5624 e表现出显著的TTV。我们在RV时间序列中发现靠近TOI-5624 e 2:1 共振的稳健的Keplerian信号，这解释了TOI-5624 e 根据我们的动力学分析所显示的TTV模式。我们将该非横行行星标记为TOI-5624 f，并测得其最小质量为M_f sin i_f=13.0±3.7 M_⊕。在已知的拥有超过四颗行星的系统中，TOI-5624的行星半径测量精度(<1.7%)和至少三颗行星质量的坚实评估(>3σ)仅在TRAPPIST-1之前已实现。额外的光度观测将启用更好的TTV调制样本并更可靠地确定行星质量。
关键词
引用
@article{arxiv.2604.15035,
title = {The multi-planet system TOI-5624: Four transiting sub-Neptunes with an outer companion revealed by transit-timing variations},
author = {A. Bonfanti and D. Gandolfi and P. Leonardi and H. P. Osborn and L. M. Serrano and G. Hébrard and N. Billot and A. Bekkelien and G. Olofsson and C. Broeg and D. Nardiello and S. G. Sousa and T. G. Wilson and A. C. M. Correia and C. Pezzotti and A. Brandeker and L. Fossati and M. Gillon and M. Stalport and B. Akinsanmi and Y. Alibert and R. Alonso and J. Asquier and T. Bárczy and D. Barrado and S. C. C. Barros and W. Baumjohann and W. Benz and L. Borsato and A. Castro González and A. Collier Cameron and Sz. Csizmadia and P. E. Cubillos and M. B. Davies and M. Deleuil and X. Delfosse and A. Deline and O. D. S. Demangeon and B. -O. Demory and A. Derekas and F. Destriez and B. Edwards and D. Ehrenreich and A. Erikson and A. Fortier and M. Fridlund and K. Gazeas and M. Güdel and M. N. Günther and N. Hara and N. Heidari and A. Heitzmann and Ch. Helling and K. G. Isaak and T. Keller and L. L. Kiss and D. Kitzmann and J. Korth and G. Lacedelli and K. W. F. Lam and J. Laskar and A. Lecavelier des Etangs and A. Leleu and M. Lendl and D. Magrin and P. F. L. Maxted and M. Mecina and B. Merín and C. Mordasini and V. Nascimbeni and R. Ottensamer and I. Pagano and E. Pallé and G. Peter and D. Piazza and G. Piotto and D. Pollacco and D. Queloz and R. Ragazzoni and N. Rando and H. Rauer and I. Ribas and N. C. Santos and G. Scandariato and D. Ségransan and A. E. Simon and A. M. S. Smith and S. Sulis and Gy. M. Szabó and S. Udry and S. Ulmer-Moll and V. Van Grootel and J. Venturini and F. Verrecchia and E. Villaver and N. A. Walton and S. Wolf and D. Wolter and T. Zingales},
journal= {arXiv preprint arXiv:2604.15035},
year = {2026}
}
备注
Accepted for publication in A&A. 22 pages (13 in the main text), 4 figures (+9 in the Appendix), 2 tables (+7 in the Appendix). Abstract abridged to satisfy the arXiv submission requirements