New Constraints on the Future Evaporation of the Young Exoplanets in the V1298 Tau System
New Constraints on the Future Evaporation of the Young Exoplanets in the V1298 Tau System
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V1298 Tau 系统年轻系外行星未来蒸发的新约束
DOI：
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发表时间：
2021
影响因子：
4.9
通讯作者：
A. Suárez Mascareño
中科院分区：
文献类型：
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作者：
A. Maggio;D. Locci;I. Pillitteri;S. Benatti;R. Claudi;S. Desidera;G. Micela;M. Damasso;A. Sozzetti;A. Suárez Mascareño
年轻时的凌日行星是提高我们对系外大气层演化的理解的关键目标。我们提出了一个新的X射线观测的V 1298头与XMM-牛顿，旨在更准确地确定高能量照射的四颗行星绕这个前主序星星星，以及可能的变化，由于磁活动的短期和长期的时间尺度。在V 1298 Tau系统的行星质量的第一次测量之后，我们修改了早期对行星大气当前逃逸率的猜测，采用我们更新的大气蒸发模型来预测该系统的未来演变。与之前的预期相反，我们发现两颗外行星不会受到Gyr时间尺度上任何蒸发的影响，而两颗较小的内行星也会受到同样的影响，除非它们的真实质量低于1040 M <$。这些结果证实了相对大质量的行星可以在其演化历史的早期达到质量半径图中的最终位置。
Transiting planets at young ages are key targets for improving our understanding of the evolution of exo-atmospheres. We present results of a new X-ray observation of V 1298 Tau with XMM-Newton, aimed to determine more accurately the high-energy irradiation of the four planets orbiting this pre-main-sequence star, and the possible variability due to magnetic activity on short and long timescales. Following the first measurements of planetary masses in the V 1298 Tau system, we revise early guesses of the current escape rates from the planetary atmospheres, employing our updated atmospheric evaporation models to predict the future evolution of the system. Contrary to previous expectations, we find that the two outer Jupiter-sized planets will not be affected by any evaporation on Gyr timescales, and the same occurs for the two smaller inner planets, unless their true masses are lower than ∼40 M ⊕. These results confirm that relatively massive planets can reach their final position in the mass–radius diagram very early in their evolutionary history.