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arXiv 2209.12752astro-ph.SRastro-ph.EP
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关于GJ 504的特征:由凌日系外行星勘测卫星(TESS)观测的磁活性行星宿主星

On the characterization of GJ 504: a magnetically active planet-host star observed by the Transiting Exoplanet Survey Satellite (TESS)

Maria Pia Di Mauro, Raffaele Reda, Savita Mathur, Rafael A. García, Derek L. Buzasi, Enrico Corsaro, Othman Benomar, Lucía González Cuesta, Keivan G. Stassun, S… 展开作者

Maria Pia Di Mauro, Raffaele Reda, Savita Mathur, Rafael A. García, Derek L. Buzasi, Enrico Corsaro, Othman Benomar, Lucía González Cuesta, Keivan G. Stassun, Serena Benatti, Luca Giovannelli, Dino Mesa, Nicolas Nardetto

摘要:

我们提出的测光数据收集的分析结果,在长和短的节奏模式的凌日系外行星调查卫星(TESS)的GJ 504,一个研究得很好的行星托管类太阳恒星,其基本参数在过去十年中有很大的争议。本文作者已经进行了几次尝试,以隔离预期在这颗主序星上的振荡特性,但我们没有发现任何类似太阳的脉动。声学模式的振幅的抑制可以解释为高水平的磁活动揭示了这个目标,不仅通过研究的光度光变曲线,而且通过分析三十年的威尔逊山光谱数据。特别是,我们对恒星自转周期Prot=3.4 d和主主磁周期12 a的测量证实了以前的发现,并使我们能够将这颗恒星定位在其演化的早期主序星阶段,在此期间,色球活动由几个周期的叠加所控制,然后过渡到磁-制动关闭,随后磁活动降低。

英文摘要:

We present the results of the analysis of the photometric data collected in long and short-cadence mode by the Transiting Exoplanet Survey Satellite (TESS) for GJ 504, a well studied planet-hosting solar-like star, whose fundamental parameters have been largely debated during the last decade. Several attempts have been made by the present authors to isolate the oscillatory properties expected on this main-sequence star, but we did not find any presence of solar-like pulsations. The suppression of the amplitude of the acoustic modes can be explained by the high level of magnetic activity revealed for this target, not only by the study of the photometric light-curve, but also by the analysis of three decades available of Mount Wilson spectroscopic data. In particular, our measurements of the stellar rotational period Prot=3.4 d and of the main principal magnetic cycle of 12 a confirm previous findings and allow us to locate this star in the early main sequence phase of its evolution during which the chromospheric activity is dominated by the superposition of several cycles before the transition to the phase of the magnetic-braking shutdown with the subsequent decrease of the magnetic activity.

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