Abstract—Based on high-precision data from the archive of the TESS space mission, a study was made of the photometric brightness variability of TOI 837—a young star with an exoplanet, a member of the southern sky cluster IC 2602. Based on all available observational results, we have estimated the star’s rotation period and brightness variability amplitude, and also estimated the absolute value of the spottedness parameter \(A\) using the standard method. The area of spots on the surface of TOI 837 is from 21 600 up to 37 700 MSH and significantly exceeds the area of sunspots. The estimates were obtained for the effective temperature of the star \({{T}_{{{\text{eff}}}}} = 6047 \pm 162\) K and radius \(R = 1.022{\kern 1pt} {{R}_{ \odot }}\). The manifestations of the TOI 837 flare activity in the observation interval in four sectors of the TESS space mission are studied and the two most reliable flares recorded are considered. The flare energies are \(1.2 \times {{10}^{{35}}}\) erg and \(2.1 \times {{10}^{{35}}}\) erg, and the probable value of the mass of the accompanying coronal mass ejection may reach \({{10}^{{21.4}}}\) g. We have estimated the most probable value of the TOI 837 activity cycle: it is 1500 days (4.1 years). A distinctive feature of TOI 837 b (as well as other exoplanets less than 100 million years old) is that its position on the diagrams “planet radius–age” and “planet radius–period of the planet’s rotation” does not overlap with populations of hot Jupiters and sub-Neptunes.

摘要：基于 TESS 空间任务档案的高精度数据，研究了 TOI 837 这颗年轻恒星的光度亮度变化，TOI 837 是一颗系外行星，属于南天星团 IC 2602。根据现有的观测结果，我们估计了恒星的自转周期和亮度变化幅度，并使用标准方法估计了斑点参数\(A\)的绝对值。TOI 837 表面的斑点面积从 21 600 到 37 700 MSH，大大超过了太阳黑子的面积。获得了恒星有效温度\({{T}_{{{\text{eff}}}}} = 6047 \pm 162\) K 和半径\(R = 1.022{\kern 1pt} {{R}_{ \odot }}\). 研究了 TOI 837 耀斑活动在 TESS 空间任务四个扇区观测区间的表现，并考虑了记录到的两个最可靠的耀斑。耀斑能量为\(1.2 \times {{10}^{{35}}}\) erg 和\(2.1 \times {{10}^{{35}}}\) erg，并且可能的值为伴随日冕物质抛射的质量可能达到\({{10}^{{21.4}}}\)G。我们估计了 TOI 837 活动周期的最可能值：它是 1500 天（4.1 年）。TOI 837 b（以及其他小于 1 亿年的系外行星）的一个显着特征是它在“行星半径-年龄”和“行星半径-行星自转周期”图上的位置不与热木星和亚海王星。