Kepler-51系统揭示第四颗行星：由历时变异公开
地球与行星天体物理
2024-10-07 v2
摘要
Kepler-51是一颗年龄约的类似太阳的恒星，拥有三颗轨道周期约-、半径约-的穿越行星。过去的Kepler和哈勃太空望远镜(HST)观测得到的历时变异(TTV)已成功通过三颗穿越行星之间的引力相互作用进行建模，推得三颗行星质量较低，平均密度亦低(。然而，近期由詹姆斯·韦伯太空望远镜(JWST)测得的Kepler-51d的穿越时间，与三行星TTV模型所预测的显著偏离，经地面观测和后续HST观测确认。我们表明，若在TTV模型中加入第四颗外侧行星Kepler-51e，即能解释三行星模型的偏差。Kepler-51e的质量范围可达，轨道周期可达。尽管如此，我们通过粗暴搜索找到的所有共面解仍暗示，三颗内侧穿越行星的质量，因此其密度仍保持较低，仅不确定性较此前估计增大。与其他可能解不同，若Kepler-51e位于与Kepler-51d约的共振位置，则所有四颗行星的轨道偏心率，且质量相当(约)，这类似于其他紧凑型多行星系统的特征。本工作表明，长期跟踪TTV系统对于探测系统中较长周期行星具有重要意义。
引用
@article{arxiv.2410.01625,
title = {A Fourth Planet in the Kepler-51 System Revealed by Transit Timing Variations},
author = {Kento Masuda and Jessica E. Libby-Roberts and John H. Livingston and Kevin B. Stevenson and Peter Gao and Shreyas Vissapragada and Guangwei Fu and Te Han and Michael Greklek-McKeon and Suvrath Mahadevan and Eric Agol and Aaron Bello-Arufe and Zachory Berta-Thompson and Caleb I. Canas and Yayaati Chachan and Leslie Hebb and Renyu Hu and Yui Kawashima and Heather A. Knutson and Caroline V. Morley and Catriona A. Murray and Kazumasa Ohno and Armen Tokadjian and Xi Zhang and Luis Welbanks and Matthew C. Nixon and Richard Freedman and Norio Narita and Akihiko Fukui and Jerome P. de Leon and Mayuko Mori and Enric Palle and Felipe Murgas and Hannu Parviainen and Emma Esparza-Borges and Daniel Jontof-Hutter and Karen A. Collins and Paul Benni and Khalid Barkaoui and Francisco J. Pozuelos and Michael Gillon and Emmanuel Jehin and Zouhair Benkhaldoun and Suzanne Hawley and Andrea S. J. Lin and Gudmundur Stefansson and Allyson Bieryla and Mesut Yilmaz and Hakan Volkan Senavci and Eric Girardin and Giuseppe Marino and Gavin Wang},
journal= {arXiv preprint arXiv:2410.01625},
year = {2024}
}
备注
48 pages, 26 figures, accepted for publication in AJ