KELT-7b 大气热力学反演谜题：使用 CHEOPS、TESS 与额外数据重审
地球与行星天体物理
2025-06-26 v1
摘要
超热行星在光学吸收剂（如 TiO 和 VO）存在时，预期显示反向温度-压力（T-P）轮廓。最近检测到 KELT-7b 的反向 T-P 轮廓，符合这些预测，但此类诊断因模型依赖性而知晓。我们使用 CHEOPS、TESS 和文献数据对 KELT-7b 的大气进行表征，重新评估其 T-P 轮廓，测量其大气辐射率，并搜索其 CHEOPS transit 光曲线因星体旋转引起的失真。我们联合拟合 CHEOPS 和 TESS 数据以测量 occluding 深度，并对 CHEOPS transit 包括重力暗化进行建模。进行辐射与传输检索，并计算 CHEOPS 和 TESS 波段下的大气辐射率。热力学平衡检索得到非反向 T-P 轮廓，而自由化学检索得到反向轮廓，可能伴随不物理的 TiO/VO 浓度。3D 一般 Circulation Model 支持 TiO 驱动的反演。我们报告几何大气辐射率为 ，与低热量再分配效率一致，并由带磁 drag 的 GCM 支持。CHEOPS 数据对天空投影轨道偏离率没有约束。检索结果在化学框架下高度依赖。自由化学拟合更佳，但风险产生不物理解。我们对 CHEOPS 和 TESS 数据应用了一致的星体变异性校正；未来观测将受益于类似处理。
引用
@article{arxiv.2506.20432,
title = {The KELT-7b atmospheric thermal-inversion conundrum revisited with CHEOPS, TESS, and additional data},
author = {Z. Garai and A. Krenn and P. E. Cubillos and G. Bruno and A. M. S. Smith and T. G. Wilson and A. Brandeker and M. N. Günther and A. Heitzmann and L. Carone and V. Singh and M. Lendl and O. D. S. Demangeon and Y. Alibert and R. Alonso and J. Asquier and T. Bárczy and D. Barrado and S. C. Barros and W. Baumjohann and W. Benz and N. Billot and L. Borsato and C. Broeg and A. Collier Cameron and A. C. M. Correia and Sz. Csizmadia and M. B. Davies and M. Deleuil and A. Deline and B. -O. Demory and A. Derekas and B. Edwards and J. A. Egger and D. Ehrenreich and A. Erikson and J. Farinato and A. Fortier and L. Fossati and M. Fridlund and D. Gandolfi and K. Gazeas and M. Gillon and M. Güdel and Ch. Helling and K. G. Isaak and F. Kerschbaum and L. Kiss and J. Korth and K. W. F. Lam and J. Laskar and A. Lecavelier des Etangs and D. Magrin and P. F. L. Maxted and B. Merín and C. Mordasini and V. Nascimbeni and G. Olofsson and R. Ottensamer and I. Pagano and E. Pallé and G. Peter and D. Piazza and G. Piotto and D. Pollacco and D. Queloz 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 S. G. Sousa and M. Stalport and S. Sulis and M. Gy. Szabó and S. Udry and S. Ulmer-Moll and V. Van Grootel and J. Venturini and E. Villaver and N. A. Walton and S. Wolf and D. Wolter and T. Zingales},
journal= {arXiv preprint arXiv:2506.20432},
year = {2025}
}
备注
Accepted for publication in A&A