Considering the importance of investigating the transit timing variations (TTVs) of transiting exoplanets, we present a follow-up study of HAT-P-12b. We include six new light curves observed between 2011 and 2015 from three different observatories, in association with 25 light curves taken from the published literature. The sample of the data used thus covers a time span of ∼ 10.2 years with a large coverage of epochs (1160) for the transiting events of the exoplanet HAT-P-12b. The light curves are utilized to determine the orbital parameters and conduct an investigation of possible TTVs. The new linear ephemeris shows a large value of reduced χ ², i.e. = 7.93, and the sinusoidal fitting using the prominent frequency coming from a periodogram shows a reduced χ ² around 4. Based on these values and the corresponding O – C diagrams, we suspect the presence of a possible non-sinusoidal TTV in this planetary system. Finally, we find that a scenario with an additional non-transiting exoplanet could explain this TTV with an even smaller reduced χ ² value of around 2.

考虑到研究凌日系外行星凌日时间变化 (TTV) 的重要性，我们提出了 HAT-P-12b 的后续研究。我们包括了 2011 年至 2015 年间从三个不同的天文台观察到的 6 条新光变曲线，以及从已发表文献中提取的 25 条光变曲线。因此，所使用的数据样本涵盖了约 10.2 年的时间跨度，其中涵盖了系外行星 HAT-P-12b 凌日事件的大时代（1160 年）。光变曲线用于确定轨道参数并对可能的 TTV 进行调查。新的线性星历表显示出较大的χ ²减少值，即= 7.93，并且使用来自周期图的显着频率的正弦拟合显示出减少的χ ²大约 4。根据这些值和相应的O - C图，我们怀疑在这个行星系统中可能存在非正弦 TTV。最后，我们发现一个额外的非凌日系外行星的场景可以解释这个 TTV，其χ ²值甚至更小，约为 2。