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arXiv 2601.04593astro-ph.EPastro-ph.IMastro-ph.SR
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研究太阳类双星行星的高能辐射环境

Investigating the High-energy Radiation Environment of Planets in Sun-like Binary Systems

University of Colorado, Boulder(科罗拉多大学博尔德分校);Laboratory for Atmospheric and Space Physics(大气与空间物理实验室);Vanderbilt University(范德堡大学);Leiden University(莱顿大学)

Patrick R. Behr, Kevin France, Nicholas Kruczek, Nicholas Nell, Brian Fleming, Stefan Ulrich, Girish M. Duvvuri, Amy Louca, Yamila Miguel

AI总结:

研究太阳类双星系统α Centauri AB的高能辐射环境,利用SISTINE光谱仪和VULCAN模型评估系外行星大气化学状态,发现恒星双星性对大气质量损失影响较小。

摘要:

远紫外(FUV)辐射是行星大气中光化学反应的驱动源。对大气观测的正确解释需要全面了解行星所暴露的辐射环境。使用亚轨道成像光谱仪(SISTINE)火箭载具光谱仪,我们观测了太阳类双星系统α Centauri AB,并同时捕捉了两颗恒星的FUV光谱。我们的光谱覆盖980-1570 Å,提供了单次曝光中最宽的FUV波长覆盖范围,并跨越几个关键恒星发射特征,这些特征对光化学反应至关重要。结合SISTINE光谱与存档观测、模型光谱和一种新的恒星活动模型,我们为α Centauri A和B分别创建了从5 Å到1 mm的光谱能量分布(SED)。我们利用这些SED来估计一个假想的围绕α Centauri A运行的系外行星所受到的总高能辐射(X射线-紫外)量。由于由于恒星伴星的轨道和每颗恒星的活动水平,辐射量会随时间变化,因此我们使用VULCAN光化学动力学代码来估算在最小和最大辐射暴露情况下的大气化学丰度。我们的结果表明,由于恒星双星性增强的大气质量损失可能不会成为未来系外行星探测任务如可居住世界观测站在寻找围绕太阳类恒星的地球类行星时的问题。

英文摘要:

Far-ultraviolet (FUV) radiation is a driving source of photochemistry in planetary atmospheres. Proper interpretation of atmospheric observations requires a full understanding of the radiation environment that a planet is exposed to. Using the Suborbital Imaging Spectrograph for Transition-region Irradiance from Nearby Exoplanet host stars (SISTINE) rocket-borne spectrograph, we observed the Sun-like binary system $α$ Centauri AB and captured the FUV spectrum of both stars simultaneously. Our spectra cover 980--1570 Å, providing the broadest FUV wavelength coverage taken in a single exposure and spanning several key stellar emission features which are important photochemical drivers. Combining the SISTINE spectrum with archival observations, model spectra, and a novel stellar activity model, we have created spectral energy distributions (SEDs) spanning 5 Å--1 mm for both $α$ Centauri A and B. We use the SEDs to estimate the total high-energy flux (X-ray--UV) incident on a hypothetical exoplanet orbiting $α$ Centauri A. Because the incident flux varies over time due to the orbit of the stellar companion and the activity level of each star, we use the VULCAN photochemical kinetics code to estimate atmospheric chemical abundances in the case of minimum and maximum flux exposure. Our results indicate that enhanced atmospheric mass loss due to stellar binarity will likely not be an issue for future exoplanet-hunting missions such as the Habitable Worlds Observatory when searching for Earth-like planets around Sun-like stars.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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