发现一颗正在脱离早A型恒星TOI-1355凌日几何的偏心热超级木星
Discovery of an Eccentric Hot Super-Jupiter Leaving the Transiting Geometry of the Early-A-type star TOI-1355
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中文总结 AI 辅助
本研究发现了一颗围绕早A型恒星TOI-1355运行的偏心热超级木星TOI-1355 b，其轨道正发生交点进动，2033年中将无法观测到其凌日，该行星或可用于未来大气观测研究。
中文摘要 AI 辅助
据推测，围绕热恒星（有效温度$T_\text{eff} > 7000$ K）运行的热木星经历过高偏心率迁移，尽管它们的轨道为圆形，但常表现出轨道错位的倾向，这是高偏心率迁移的证据。本文介绍TOI-1355 b的发现：该行星是一颗偏心（偏心率$e\backsim0.22$）热木星，质量$m_\text{p}\backsim5.8M_J$，半径$R_\text{p}\backsim1.4R_J$，围绕一颗A型恒星运行，轨道周期约为2.17天，由TESS凌日巡天及后续后续观测确认。研究人员利用高分辨率光谱仪Seimei/GAOES-RV的数据测量恒星参数，通过TESS及地基望远镜获取的测光数据得到行星参数。该行星是热恒星周围罕见的偏心热木星之一，该系统可能正处于高偏心率迁移过程中；研究人员通过测量 impact parameter（撞击参数）的变化探测到交点进动，这意味着从2033年年中开始，将无法再观测到该行星的凌日现象。不过，鉴于本研究检测到大气变异性的迹象，TOI-1355 b有望成为未来大气观测的重要目标。
英文摘要
Hot Jupiters orbiting hot stars ($T_\mathrm{eff} > 7000$ K) are suggested to have experienced high-eccentricity migration, often evidenced by the tendency for misaligned orbits, despite their circular orbits. In this paper, we present the discovery of TOI-1355 b: an eccentric ($e\sim0.22$) hot Jupiter with a mass of $m_{\mathrm{p}}\sim5.8M_J$ and a radius of $R_{\mathrm{p}}\sim 1.4R_J$ orbiting an A-type star with a period of about $2.17$ days, identified from the TESS transit survey and subsequent follow-up observations. We measured the stellar parameters using the data from the high-resolution spectrograph Seimei/GAOES-RV and obtained the planetary parameters from the photometric data acquired by TESS and ground-based telescopes. This is one of the rare eccentric hot Jupiters around hot stars. This system could be undergoing high-eccentricity migration. We detected nodal precession by measuring the change in its impact parameter. This implies that its transit will no longer be observable from the middle of 2033. Nevertheless, TOI-1355 b is anticipated to be a compelling target for future atmospheric observations, given the hint of atmospheric variability detected in this study.
