Abstract

Based on highly accurate data from the archive of the TESS space mission, we have studied the photometric variability of the K1-type dwarf AB Pic (HD 44627), which is a member of the Tuc–Hor association and possesses a distant giant planet with a mass of 13.5 Jupiter masses. In the interval of its TESS observations 48 flares with an energy in the range \(6.1\times 10^{32}{-}3.4\times 10^{35}\) erg were detected on the star. We have estimated the stellar rotation period, \(P=3.860\pm 0.020\) days, and the photometric variability amplitude as well as estimated the spottedness parameter \(A\) by a standard technique. The spot area on the surface of AB Pic is considerably larger than that on the Sun and varies within the range from 54 000 to 95 000 m.s.h. We suggest that during the interval of its observations the spot area on the stellar surface had cyclic variations with a duration of 233 days, an analog of which may be the so-called Rieger periodicity on the Sun. We have estimated the longer activity cycles of AB Pic based on data from the All Sky Automated Survey archive and revealed possible activity cycles of 258, 1120 days (3.1 years), and 2640 days (7.2 years). The range of possible variations in the CME mass for this star has been estimated.

中文翻译：

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来自 Young Tuc-Hor 协会的 Star AB Pic 与一颗系外行星的活动

摘要

基于来自苔丝太空任务档案的高精度数据，我们研究了 K1 型矮星 AB Pic (HD 44627) 的光度变化，它是 Tuc-Hor 协会的成员，拥有一颗遥远的巨行星质量为 13.5 木星质量。在其 TESS 观测间隔中，在这颗恒星上检测到48 个能量范围为\(6.1\times 10^{32}{-}3.4\times 10^{35}\) erg 的耀斑。我们估计了恒星的自转周期\(P=3.860\pm 0.020\)天，以及光度变化幅度以及估计的斑点参数\(A\)通过标准技术。AB Pic 表面的光斑面积比太阳大得多，变化范围为 54 000 至 95 000 msh 我们认为在其观测间隔期间，恒星表面的光斑面积具有周期性变化持续时间为 233 天，与之类似的可能是太阳上所谓的里格周期。我们根据 All Sky Automated Survey 档案中的数据估计了 AB Pic 更长的活动周期，并揭示了 258、1120 天（3.1 年）和 2640 天（7.2 年）的可能活动周期。已经估计了这颗恒星的 CME 质量可能变化的范围。