CHEOPS对K2-24行星系统的再考察
地球与行星天体物理
2024-10-23 v3 太阳与恒星天体物理
摘要
K2-24是一个行星系统，由两颗凌星的低密度海王星型行星组成，锁定在近乎完美的2:1共振中并显示出大的TTV，即寻找行星迁移特征的极佳实验室。先前使用K2、Spitzer和RV数据进行的研究初步声称其中一颗或两颗行星具有显著的非零偏心率，可能高到足以挑战通过共振俘获的纯盘迁移情景。凭借13条新的CHEOPS光变曲线（行星-b七条，行星-c六条），我们通过纳入所有可用的文献数据，进行了全局测光与动力学再分析。我们获得了K2-24系统迄今最精确的行星参数集，包括精度达1%和5%的半径与质量（目前基本受限于恒星参数的不确定性），以及以极高显著性在两颗行星上检测到的非零偏心率 、。如此相对较大的值意味着在迁移阶段期间或之后需要额外的偏心率激发物理机制。此外，虽然先前TTV模型的精度目前已偏移多达0.5天，但我们足够牢固地约束了轨道解，从而能够预测未来约15年即将发生的凌星，进而实现利用JWST或ESPRESSO等顶级设施进行高效的后随观测。
引用
@article{arxiv.2409.02995,
title = {The K2-24 planetary system revisited by CHEOPS},
author = {V. Nascimbeni and L. Borsato and P. Leonardi and S. G. Sousa and T. G. Wilson and A. Fortier and A. Heitzmann and G. Mantovan and R. Luque and T. Zingales and G. Piotto and Y. Alibert and R. Alonso and T. Bárczy and D. Barrado Navascues and S. C. Barros and W. Baumjohann and T. Beck and W. Benz and N. Billot and F. Biondi and A. Brandeker and C. Broeg and M. -D. Busch and A. Collier Cameron and A. C. M. Correia and Sz. Csizmadia and P. E. Cubillos and M. B. Davies and M. Deleuil and A. Deline and L. Delrez and O. D. S. Demangeon and B. -O. Demory and A. Derekas and B. Edwards and D. Ehrenreich and A. Erikson and L. Fossati and M. Fridlund and D. Gandolfi and K. Gazeas and M. Gillon and M. Güdel and M. N. Günther and Ch. Helling and K. G. Isaak and F. Kerschbaum and L. Kiss and J. Korth 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 B. Merín and C. Mordasini and G. Olofsson and R. Ottensamer and I. Pagano and E. Pallé and G. Peter 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 R. Southworth and M. Stalport and S. Sulis and M. Gy. Szabó and S. Udry and B. Ulmer and V. Van Grootel and J. Venturini and E. Villaver and N. A. Walton},
journal= {arXiv preprint arXiv:2409.02995},
year = {2024}
}
备注
19 pages, 11 figures, 8 tables. Accepted for publication in A&A on September 4, 2024. Typos corrected