CHEOPS增强视角下的HD3167系统观测
地球与行星天体物理
2022-12-14 v2 太阳与恒星天体物理
摘要
对于小于海王星尺寸的系外行星，其本质仍有许多未解之谜，这类行星大多发现于致密多行星系统中。HD 3167多行星系统具有特殊架构：其内侧超短周期行星b与恒星对齐，而外侧较大的行星d与c处于极轨道，这为研究动力学与大气演化过程提供了可能。为此，我们联合了凌星测光与视向速度（RV）的多组数据集，以修正系统性质并为行星模型提供约束。该工作以CHEOPS对HD 3167b的观测为主导，尽管其遭受极端辐照，观测却似乎与纯岩石成分不符。总体上，行星轨道周期的精度提高了一个数量级，且凌星行星b和c的密度不确定性降低了3倍。内部结构及大气模拟刻画了HD 3167d与HD 3167c的鲜明对比：前者可能是经光致蒸发失去大气的岩石超级地球，后者则是保留大量原初气态包层的迷你海王星。我们探测到第四颗质量更大、轨道更外的行星，可能与HD 3167d-c共面。动力学模拟表明，外行星系统d-c-e在系统历史早期整体发生倾斜，而彼时HD 3167b仍受恒星主导并维持其对齐轨道。RV数据与直接成像排除了导致当前架构的伴星仍束缚于HD\,3167系统的可能。对多行星系统的类似全局研究将揭示多少系统具有HD3167系统的特殊性质，其仍是后续观测与模拟的优选目标。
引用
@article{arxiv.2209.06937,
title = {A CHEOPS-enhanced view of the HD3167 system},
author = {V. Bourrier and A. Deline and A. Krenn and J. A. Egger and A. C. Petit and L. Malavolta and M. Cretignier and N. Billot and C. Broeg and H. -G. Florén and D. Queloz and Y. Alibert and A. Bonfanti and A. S. Bonomo and J. -B. Delisle and O. D. S. Demangeon and B. -O. Demory and X. Dumusque and D. Ehrenreich and R. D. Haywood and S. B Howell and M. Lendl and A. Mortier and G. Nigro and S. Salmon and S. G. Sousa and T. G. Wilson and V. Adibekyan and R. Alonso and G. Anglada and T. Bárczy and D. Barrado y Navascues and S. C. C. Barros and W. Baumjohann and M. Beck and W. Benz and F. Biondi and X. Bonfils and A. Brandeker and J. Cabrera and S. Charnoz and Sz. Csizmadia and A. Collier Cameron and M. Damasso and M. B. Davies and M. Deleuil and L. Delrez and L. Di Fabrizio and A. Erikson and A. Fortier and L. Fossati and M. Fridlund and D. Gandolfi and M. Gillon and M. Güdel and K. Heng and S. Hoyer and K. G. Isaak and L. L. Kiss and J. Laskar and A. Lecavelier des Etangs and V. Lorenzi and C. Lovis and D. Magrin and A. Massa and P. F. L. Maxted and V. Nascimbeni and G. Olofsson and R. Ottensamer and I. Pagano and E. Pallé and G. Peter and G. Piotto and D. Pollacco 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 V. Van Grootel and F. Verrecchia and N. Walton and T. Beck and M. Buder and F. Ratti and B. Ulmer and V. Viotto},
journal= {arXiv preprint arXiv:2209.06937},
year = {2022}
}
备注
22 pages, 23 pages, accepted for publication in A&A (18 August 2022). Updated author list in new version