发表机构
Macquarie University（麦考瑞大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究升级InstellCa代码为InstellCa-2.0，以55 Cancri e为案例，证实旋转与主恒星距离影响岩质系外行星亮温度，其几何模型结果与JWST观测值吻合，协调了此前相关研究。
AI 中文摘要
本研究对基于几何的InstellCa代码进行了扩展，该代码用于计算精确的辐照度值，升级为InstellCa-2.0，可计算行星给定纬度上的经度平均辐照度及其热剖面。辐照度的估算将行星视为3D天体，其相对于恒星旋转，恒星天顶角随日周期变化。我们聚焦于辐照几何对一类特殊的超短周期（USP）岩质行星的影响，这类行星可能呈现异步旋转，以此作为专门案例研究，阐明旋转及与主恒星的距离如何影响裸岩质世界的估算亮温度。选择55 Cancri e作为研究对象，是因为此前已假设它存在异步旋转，且其大气是否存在的科学讨论尚存争议。结果显示，在裸岩质行星及对应邦德反照率（A_B = 0.3）的假设下，通过几何模型计算的半球平均亮温度，与詹姆斯·韦伯空间望远镜（JWST）中红外仪器（MIRI）对55 Cancri e的高精度亮温度估算值（1796 K）高度吻合，这为观测到的热印记提供了自然解释，巧妙协调了该行星此前的相关研究。
英文摘要
This study augments the geometry-based InstellCa code that calculates accurate irradiance values to InstellCa--2, which computes the longitude averaged instellation over a given latitude on the planet along with its effective temperature profile. The estimation of instellation is performed considering the planet as a 3D body that asynchronously rotates, causing a varying zenith angle of the star resulting in a diurnal cycle. This serves as a specialised case study to demonstrate how the combination of this relative rotation and extreme proximity to host-stars can affect the estimated effective temperatures of close-in planets. 55 Cancri e is selected specifically to demonstrate the importance of this effect as it has been earlier hypothesised to exhibit asynchronous rotation and also has a debated scientific discourse about the existence of an atmosphere on the planet. The TRAPPIST-1 system, being a multi-planetary system susceptible to mean motion resonances, also serves as an interesting exemplar case to demonstrate these effects. Incorporating the stellar zenith angle to the geometrical analysis allows the possibility of physically feasible Bond albedo values that would otherwise be prohibited if a synchronously rotating bare rock scenario is assumed. Consequently, the degeneracies in the modelling of different atmospheric states of such planets can be reduced if the correct geometry is taken into account.
CommentsContent : 6 pages, 7 figures, 2 tables
