HIP 65426 b 的首次 VLTI/GRAVITY 观测：低或中等轨道偏心率的证据
地球与行星天体物理
2023-10-10 v2
摘要
巨行星系外行星已在多个数量级的轨道间距上被直接成像，这促使了关于其形成途径的理论与观测研究。在本文中，我们展示了 HIP 65426 b 的新 VLTI/GRAVITY 天体测量数据，这是一颗寒冷的巨行星系外行星，在其与主星 92 au 的投影间距下对大多数形成理论都是特别的挑战。借助 GRAVITY 的天体测量精度，我们给出了更新的偏心率后验分布，该分布不支持大偏心率。偏心率后验仍依赖于先验，我们广泛地解释并讨论了此处给出的后验约束的局限性。我们还使用自洽的正向建模光谱进行了更新的光谱比较，找到了一个最佳拟合的 ExoREM 模型，其具有太阳金属丰度与 C/O=0.6。一个重要的注意事项是，很难对这些数值估计稳健的误差，它们受到插值误差以及可能缺失的模型物理的影响。综合来看，轨道与大气约束描绘了一幅与盘消散后散射不一致的形成初步图像。需要进一步的工作来验证这一解释。用于执行本工作的分析代码可在 https://github.com/sblunt/hip65426 获取。
引用
@article{arxiv.2310.00148,
title = {First VLTI/GRAVITY Observations of HIP 65426 b: Evidence for a Low or Moderate Orbital Eccentricity},
author = {S. Blunt and W. O. Balmer and J. J. Wang and S. Lacour and S. Petrus and G. Bourdarot and J. Kammerer and N. Pourré and E. Rickman and J. Shangguan and T. Winterhalder and R. Abuter and A. Amorim and R. Asensio-Torres and M. Benisty and J. -P. Berger and H. Beust and A. Boccaletti and A. Bohn and M. Bonnefoy and H. Bonnet and W. Brandner and F. Cantalloube and P. Caselli and B. Charnay and G. Chauvin and A. Chavez and E. Choquet and V. Christiaens and Y. Clénet and V. Coudé du Foresto and A. Cridland and R. Dembet and A. Drescher and G. Duvert and A. Eckart and F. Eisenhauer and H. Feuchtgruber and P. Garcia and R. Garcia Lopez and E. Gendron and R. Genzel and S. Gillessen and J. H. Girard and X. Haubois and G. Heißel and Th. Henning and S. Hinkley and S. Hippler and M. Horrobin and M. Houllé and Z. Hubert and L. Jocou and M. Keppler and P. Kervella and L. Kreidberg and A. -M. Lagrange and V. Lapeyrère and J. -B. Le Bouquin and P. Léna and D. Lutz and A. -L. Maire and F. Mang and G. -D. Marleau and A. Mérand and P. Mollière and J. D. Monnier and C. Mordasini and D. Mouillet and E. Nasedkin and M. Nowak and T. Ott and G. P. P. L. Otten and C. Paladini and T. Paumard and K. Perraut and G. Perrin and O. Pfuhl and L. Pueyo and J. Rameau and L. Rodet and Z. Rustamkulov and T. Shimizu and D. Sing and T. Stolker and C. Straubmeier and E. Sturm and L. J. Tacconi and E. F. van Dishoeck and A. Vigan and F. Vincent and K. Ward-Duong and F. Widmann and E. Wieprecht and E. Wiezorrek and J. Woillez and S. Yazici and A. Young},
journal= {arXiv preprint arXiv:2310.00148},
year = {2023}
}
备注
28 pages, 14 figures. Revised and resubmitted to AJ