热木星HD 209458b的CHEOPS几何反照率
地球与行星天体物理
2022-03-09 v1
摘要
我们报道了利用CHEOPS空间望远镜在光学/可见光波段探测到热木星HD 209458b的次食。我们测得的20.4 ± 3.3 ppm对应于几何反照率A_g = 0.096 ± 0.016。先前估算的约1500 K的昼侧温度意味着我们的几何反照率测量主要由反射星光组成,且基本不受热辐射污染。这使得当前结果成为任何系外行星最稳健的A_g测量之一。我们的带通积分几何反照率计算表明,测得的A_g值与无云大气一致,其中星光由氢分子通过瑞利散射反射,且水和钠的丰度与恒星金属丰度一致。我们预测带通积分的TESS几何反照率太暗而无法探测,并且若大气确实无云,CHEOPS观测到的HD 209458b相位曲线将具有与瑞利散射相关的独特形状。
引用
@article{arxiv.2202.11516,
title = {CHEOPS geometric albedo of the hot Jupiter HD 209458b},
author = {A. Brandeker and K. Heng and M. Lendl and J. A. Patel and B. M. Morris and C. Broeg and P. Guterman and M. Beck and P. F. L. Maxted and O. Demangeon and L. Delrez and B. -O. Demory and D. Kitzmann and N. C. Santos and V. Singh and Y. Alibert and R. Alonso and G. Anglada and T. Bárczy and D. Barrado y Navascues and S. C. C. Barros and W. Baumjohann and T. Beck and W. Benz and N. Billot and X. Bonfils and G. Bruno 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 A. Deline and D. Ehrenreich and A. Erikson and J. Farinato and A. Fortier and L. Fossati and M. Fridlund and D. Gandolfi and M. Gillon and M. Güdel and S. Hoyer and K. G. Isaak and L. Kiss and J. Laskar and A. Lecavelier des Etangs and C. Lovis and A. Luntzer and D. Magrin 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 D. Queloz and R. Ragazzoni and N. Rando and H. Rauer and I. Ribas and G. Scandariato and D. Ségransan and A. E. Simon and A. M. S. Smith and S. G. Sousa and M. Steller and Gy. M. Szabó and N. Thomas and S. Udry and V. Van Grootel and N. Walton and D. Wolter},
journal= {arXiv preprint arXiv:2202.11516},
year = {2022}
}
备注
9 pages, accepted by A&A Letters