利用 Cheops 测光约束 WASP-178b 的反射特性
地球与行星天体物理
2023-09-19 v1
摘要
系外行星二次掩食的多波段测光能够区分来自行星昼面的反射光和热辐射光。这导致对行星几何反照率 的测量， 是大气中云存在的指示物，以及再循环效率 ，其量化大气内的能量传输。在这项工作中，我们旨在测量行星 WASP-178 b 的 和 ，这是一个高辐照巨行星，估计平衡温度为 2450 K。我们分析档案光谱以及由 Cheops 和 Tess 收集的 light curves，以表征宿主星 WASP-178，精化系统的星历并测量两个相应望远镜通带中的掩食深度。我们在 Tess 通带中测量到边际显著的 7040 ppm 掩食深度，以及在 Cheops 通带中统计显著的 7020 ppm 深度。结合 Cheops（lambda_eff=6300 AA）和 Tess（lambda_eff=8000 AA）通带中的掩食深度测量，我们将 WASP-178 b 的昼面亮度温度约束在 2250-2800 K 区间。几何反照率 0.1<<0.35 与弱反射巨行星的图像总体一致，而再循环效率 0.7 使 WASP-178 b 成为测试当前热再循环模型的有趣实验室。
引用
@article{arxiv.2309.09037,
title = {Constraining the reflective properties of WASP-178b using Cheops photometry},
author = {I. Pagano and G. Scandariato and V. Singh and M. Lendl and D. Queloz and A. E. Simon and S. G. Sousa and A. Brandeker and A. Collier Cameron and S. Sulis and V. Van Grootel 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 M. Beck and T. Beck and W. Benz and N. Billot and X. Bonfils and L. Borsato and C. Broeg and G. Bruno and L. Carone and S. Charnoz and C. Corral van Damme and Sz. Csizmadia and P. E. Cubillos and M. B. Davies and M. Deleuil and A. Deline and L. Delrez and O. D. S. Demangeon and B. -O. Demory and D. Ehrenreich and A. Erikson and A. Fortier and L. Fossati and M. Fridlund and D. Gandolfi and M. Gillon and M. Güdel and M. N. Günther and Ch. Helling and S. Hoyer and K. G. Isaak and L. L. Kiss and E. Kopp and K. W. F. Lam and J. Laskar and A. Lecavelier des Etangs and D. Magrin and P. F. L. Maxted and C. Mordasini and M. Munari and V. Nascimbeni and G. Olofsson and R. Ottensamer and E. Pallé and G. Peter and G. Piotto and D. Pollacco and R. Ragazzoni and N. Rando and H. Rauer and C. Reimers and I. Ribas and M. Rieder and N. C. Santos and D. Ségransan and A. M. S. Smith and M. Stalport and M. Steller and Gy. M. Szabó and N. Thomas and S. Udry and J. Venturini and N. A. Walton},
journal= {arXiv preprint arXiv:2309.09037},
year = {2023}
}
备注
Accepted by Astronomy and Astrophysics on 31/08/2023