2024年CHEOPS测光揭示AU Mic c的凌星时间变化发生反转
CHEOPS photometry from 2024 reveals a reversal in the transit-timing variations of AU Mic c
浏览论文内容
中文总结 AI 辅助
本研究利用2024年CHEOPS对AU Mic b、c的凌星观测，发现AU Mic c的凌星时间变化趋势发生反转，确定了AU Mic b的凌星时间参数，强调需长期监测该年轻行星系统。
中文摘要 AI 辅助
我们展示了2024年6月至9月获取的AU Mic b和AU Mic c的新CHEOPS凌星观测结果，延长了这个年轻行星系统凌星时间测量的基线。对于AU Mic b，其凌星时间信号已得到充分确认，半振幅为10±3分钟，特征调制时标为1168±20天，与之前的测定结果一致。相比之下，新的CHEOPS数据显示，之前报道的AU Mic c的大幅凌星时间偏差并未持续。在2022年和2023年观测到的持续上升的时间趋势之后，2024年的凌星时间回到了观测减计算图的零点附近，表明之前报道的行为发生了反转。对于AU Mic c，其凌星时间半振幅（46±26分钟）和特征调制时标（2150±110天）仍处于暂定状态。这些结果凸显了对AU Mic系统进行持续长期监测的重要性。
英文摘要
We present new CHEOPS transit observations of AU Mic b and AU Mic c obtained between June and September 2024, extending the baseline of transit-timing measurements of this young planetary system. For AU Mic b, the timing signal is well established, with a semi-amplitude (10 $\pm$ 3 min) and a characteristic modulation timescale (1168 $\pm$ 20 d) consistent with previous determinations. By contrast, the new CHEOPS data show that the large transit-timing deviation of AU Mic c reported previously was not sustained. After the steadily increasing timing trend observed in 2022 and 2023, the 2024 timings returned closer to the zero point of the observed-minus-calculated diagram, indicating a reversal of the previously reported behavior. For AU Mic c, both the transit-timing semi-amplitude (46 $\pm$ 26 min) and the characteristic modulation timescale (2150 $\pm$ 110 d) remain tentative. These results highlight the importance of continued long-term monitoring of the AU Mic system.
