由 CHEOPS 相位曲线探测的 WASP-189 b 的大气与系统构型
地球与行星天体物理
2022-03-14 v3 太阳与恒星天体物理
摘要
绕炽热大质量早型星近距离运行的气体巨行星可达到与最冷恒星相当的白昼面温度。这些“超热木星”的大气由分子解离产生的离子与原子物种构成,并具有强烈的昼夜温度梯度。不同轨道相位的测光观测可洞察行星大气性质。我们分析用 CHEOPS 仪器获取的 WASP-189 测光观测,以推导对系统构型与行星大气的约束。我们实现了适用于由快速自转宿主星重力昏暗光球所致非对称凌星形状的凌星光变模型。我们还对行星通量的反射与热辐射分量、恒星扁率与光行时对凌星–食时刻的影响、恒星活动及 CHEOPS 系统误差进行建模。由非对称凌星,我们测得超热木星 WASP-189 b 的尺度 (精度 1%)及行星系统真实轨道倾角 (极轨道)。我们未检测到来自相位曲线的显著热斑偏移,并获得食深 ,由此导出几何反照率上限:。我们还发现,仅在能量再分布极低效的情况下,食深才可单独由热辐射解释。最后,我们将测光变率归因于恒星自转,或通过表面不均匀性,或通过对流核与辐射包层间的共振耦合。
引用
@article{arxiv.2201.04518,
title = {The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve},
author = {A. Deline and M. J. Hooton and M. Lendl and B. Morris and S. Salmon and G. Olofsson and C. Broeg and D. Ehrenreich and M. Beck and A. Brandeker and S. Hoyer and S. Sulis and V. Van Grootel and V. Bourrier and O. Demangeon and B. -O. Demory and K. Heng and H. Parviainen and L. M. Serrano and V. Singh and A. Bonfanti and L. Fossati and D. Kitzmann and S. G. Sousa and T. G. Wilson and Y. Alibert and R. Alonso and G. Anglada and T. Bárczy and D. Barrado Navascues and S. C. C. Barros and W. Baumjohann and T. Beck and A. Bekkelien and W. Benz and N. Billot and X. Bonfils and J. Cabrera and S. Charnoz and A. Collier Cameron and C. Corral van Damme and Sz. Csizmadia and M. B. Davies and M. Deleuil and L. Delrez and T. de Roche and A. Erikson and A. Fortier and M. Fridlund and D. Futyan and D. Gandolfi and M. Gillon and M. Güdel and P. Gutermann and J. Hasiba and K. G. Isaak and L. Kiss and J. Laskar and A. Lecavelier des Etangs and C. Lovis and D. Magrin and P. F. L. Maxted and M. Munari and V. Nascimbeni and R. Ottensamer and I. Pagano and E. Pallé and G. Peter 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 M. Steller and Gy. M. Szabó and N. Thomas and S. Udry and I. Walter and N. Walton},
journal= {arXiv preprint arXiv:2201.04518},
year = {2022}
}
备注
25 pages, 16 figures, 5 tables (including the appendix); published in A&A