WASP-12b潮汐变形与大气
地球与行星天体物理
2024-02-21 v2
摘要
超热行星提供了理解极端条件下行星物理与化学的独特机会。WASP-12b是这类系外行星中的典型代表。我们通过将新的CHEOPS观测数据与之前的TESS和Spitzer数据相结合，对WASP-12b的穿越、遮挡和相位曲线进行了全面分析，以测量行星的潮汐变形、大气特性以及轨道衰减率。将行星建模为二次流体爱 numbers 参数化的三轴椭球体，该数值量化了其径向变形，为理解其内部结构提供了洞见。我们测得WASP-12b的潮汐变形，并从其相位曲线估算出爱 numbers值为 （在3.2显著性水平）。在CHEOPS和TESS波段下，我们分别测得遮挡深度为 ppm和 ppm，而日侧辐射光谱表明，CHEOPS和TESS在2900K温度下的大气中探测到类似的压力层次。我们还估算了CHEOPS和TESS波段下的几何散射度分别为 和 ，表明WASP-12b日侧不存在反射性云层。CHEOPS的遮挡未显示出日侧大气强烈的变率。最后，我们将轨道衰减率 refined by 12%，数值值为 -30.230.82 ms/yr。WASP-12b成为第二颗从潮汐变形效应（在3显著性水平）测得爱 numbers的系外行星（继WASP-103b之后）。然而，要确定该行星的核心质量分数，仍需以更高精度测得 。这可以通过使用JWST进行高信噪比观测来实现，因为相位曲线幅度（以及随之而来的潮汐变形效应）在红外波段更大。
引用
@article{arxiv.2402.10486,
title = {The tidal deformation and atmosphere of WASP-12b from its phase curve},
author = {B. Akinsanmi and S. C. C. Barros and M. Lendl and L. Carone and P. E. Cubillos and A. Bekkelien and A. Fortier and H. -G. Florén and A. Collier Cameron and G. Boué and G. Bruno and B. -O. Demory and A. Brandeker and S. G. Sousa and T. G. Wilson and A. Deline and A. Bonfanti and G. Scandariato and M. J. Hooton and A. C. M. Correia and O. D. S. Demangeon and A. M. S. Smith and V. Singh and Y. Alibert and R. Alonso and J. Asquier and T. Bárczy and D. Barrado Navascues and W. Baumjohann and M. Beck and T. Beck and W. Benz and N. Billot and X. Bonfils and L. Borsato and Ch. Broeg and M. Buder and S. Charnoz and Sz. Csizmadia and M. B. Davies and M. Deleuil and L. Delrez and D. Ehrenreich and A. Erikson and J. Farinato and L. Fossati and M. Fridlund and D. Gandolfi and M. Gillon and M. Güdel and M. N. Günther and A. Heitzmann and Ch. Helling and S. Hoyer and K. G. Isaak and L. L. Kiss and K. W. F. Lam and J. Laskar and A. Lecavelier des Etangs and D. Magrin and P. F. L. Maxted and M. Mecina and Ch. 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 D. Ségransan and A. E. Simon and M. Stalport and Gy. M. Szabó and N. Thomas and S. Udry and V. Van Grootel and J. Venturini and E. Villaver and N. A. Walton},
journal= {arXiv preprint arXiv:2402.10486},
year = {2024}
}
备注
accepted for publication in A&A