三行星系统TOI-270中的凌星时刻变化
地球与行星天体物理
2023-08-22 v1
摘要
我们呈现了TOI-270 (L231-32)的地面与空间测光观测，这是一个由一颗超级地球和两颗亚海王星组成的三凌星行星系统，由TESS在一颗明亮(K星等=8.25)的M3V矮星周围发现。这些行星在近低阶平运动共振(5:3与2:1)附近轨道运行，因此预期会表现出大的凌星时刻变化(TTVs)。在2018至2020年间使用8个不同天文台开展的广泛观测活动之后，我们现在报告对行星c和d的TTV的明确探测，其振幅约为10分钟、超级周期约为3年，以及对所有三颗行星半径和平均轨道周期的显著精细化估计。仅对TTV的动力学建模就对行星c与d的质量比及其偏心率施加了强约束。当纳入最近发表的径向速度观测约束时，我们得到行星b、c和d的质量分别为M_b=1.48±0.18 M_⊕、M_c=6.20±0.31 M_⊕和M_d=4.20±0.16 M_⊕。我们还探测到所有三颗行星均具有小但显著的偏心率：e_b=0.0167±0.0084、e_c=0.0044±0.0006和e_d=0.0066±0.0020。我们的发现意味着内行星具有类地岩质成分，而外两颗行星具有类地核并附带额外的He/H2O大气。TOI-270如今是约束最好的小凌星行星系统之一，并且仍是大气表征的极佳目标。
引用
@article{arxiv.2308.10763,
title = {Transit Timing Variations in the three-planet system: TOI-270},
author = {Laurel Kaye and Shreyas Vissapragada and Maximilian N. Gunther and Suzanne Aigrain and Thomas Mikal-Evans and Eric L. N. Jensen and Hannu Parviainen and Francisco J. Pozuelos and Lyu Abe and Jack S. Acton and Abdelkrim Agabi and Douglas R. Alves and David R. Anderson and David J. Armstrong and Khalid Barkaoui and Oscar Barragan and Bjorn Benneke and Patricia T. Bo yd and Rafael Brahm and Ivan Bruni and Edward M. Bryant and Matthew R. Burleigh and Sarah L. Casewell and David Ciardi and Ryan Cloutier and Karen A. Collins and Kevin I. Collins and Dennis M. Conti and Ian J. M. Crossfield and Nicolas Crouzet and Tansu Daylan and Diana Dragomir and Georgina Dransfield and Daniel F abrycky and Michael Fausnaugh and Gabor Fuuresz and Tianjun Gan and Samuel Gill and Michael Gillon and Michael R Goad and Varoujan Gorjian and Michael Greklek-McKeon and Natalia Guerrero and Tristan Guillot and Emmanuel Jehin and J. S. Jenkins and Monika Lendl and Jacob Kamler and Stephen R. Kane and John F. Kielkopf and Michelle Kunimoto and Wenceslas Marie-Sainte and James McCormac and Djamel Mekarnia and Farisa Y. Morales and Maximiliano Moyano and Enric Palle and Vivien Parmentier and Howard M. Relles and Francois-Xavier Schmider and Richard P. Schwarz and S. Seager and Alexis M. S. Smith and Thiam-Guan Tan and Jake Taylor and Amaury H. M. J. Triaud and Joseph D. Twicken and Stephane Udry and J. I. Vines and Gavin Wang and Peter J. Wheatley and Joshua N. Winn},
journal= {arXiv preprint arXiv:2308.10763},
year = {2023}
}
备注
22 pages, 7 figures