CHEOPS发现KELT-1b在可见光下比预期更暗：CHEOPS与TESS掩食深度的差异
地球与行星天体物理
2022-12-14 v1 天体物理仪器与方法
摘要
近期基于TESS的研究表明，强辐照棕矮星KELT-1b的白天面在可见光下显著亮于基于Spitzer红外观测的预期。我们利用CHEOPS（CHaracterising ExOPlanet Satellite，系外行星表征卫星）观测了KELT-1b的八次掩食，以在迄今观测到的最蓝波段测量其白天面亮温，并将CHEOPS测光与现有的来自TESS、LBT、CFHT和Spitzer的光学及近红外测光联合建模。我们的建模得到了KELT-1b覆盖CHEOPS、TESS、H、Ks以及Spitzer IRAC 3.6和4.5 m波段的自洽白天面光谱，其中我们对TESS、H、Ks和Spitzer波段的估计与先前研究大体一致，但我们发现CHEOPS与TESS波段之间存在强烈差异。CHEOPS观测比TESS观测具有更高的测光精度，但未显示出显著的掩食信号，而在TESS波段检测到了深掩食。推导出的TESS几何反照率为，难以与一致的零值CHEOPS几何反照率相协调，因为两个波段有相当大重叠。由瞬态夜侧云向昼侧输送引起的云量变化可为调和TESS与CHEOPS几何反照率提供解释，但这一假设需由未来观测检验。
引用
@article{arxiv.2209.03890,
title = {CHEOPS finds KELT-1b darker than expected in visible light: Discrepancy between the CHEOPS and TESS eclipse depths},
author = {H. Parviainen and T. G. Wilson and M. Lendl and D. Kitzmann and E. Pallé and L. M. Serrano and E. Meier Valdes and W. Benz and A. Deline and D. Ehrenreich and P. Guterman and K. Heng and O. D. S. Demangeon and A. Bonfanti and S. Salmon and V. Singh and N. C. Santos and S. G. Sousa 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 M. Beck and T. Beck and N. Billot and X. Bonfils and A. Brandeker and C. Broeg 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 B. -O. Demory 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. L. Kiss and E. Kopp and J. Laskar and A. Lecavelier des Etangs and C. Lovis and D. Magrin and P. F. L. Maxted and M. Mecina and V. Nascimbeni and G. Olofsson and R. Ottensamer and I. Pagano and G. Peter and D. Piazza and G. Piotto and D. Pollacco and D. Queloz and R. Ragazzoi 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 M. Steller and Gy. M. Szabó and N. Thomas and S. Udry and V. VanGrootel and N. A. Walton},
journal= {arXiv preprint arXiv:2209.03890},
year = {2022}
}
备注
Accepted to A&A