Here we use a 3‐D climate system model to study the habitability of Earth‐like planets orbiting in circumbinary systems. In the most extreme cases, Earth‐like planets in circumbinary systems could experience variations in the incident stellar flux of up to ~50% on ~100‐day timescales. However, we find that Earth‐like planets, having abundant surface liquid water, are generally effective at buffering against these time‐dependent changes in the stellar irradiation due to the high thermal inertia of oceans compared with the relatively short periods of circumbinary‐driven variations in the received stellar flux. Ocean surface temperatures exhibit little to no variation in time; however, land surfaces can experience modest changes in temperature, thus exhibiting an additional mode of climate variability driven by the circumbinary variations. Still, meaningful oscillations in surface temperatures are only found for circumbinary system architectures featuring the largest physically possible amplitudes in the stellar flux variation. In the most extreme cases, an Earth‐like planet could experience circumbinary‐driven variations in the global mean land surface temperature of up to ~5 K, and variations of local daytime maximum temperatures of up to ~12 K on seasonal timescales, while the global mean ocean temperatures vary by less than ~2 K. Such seasonal temperature swings over land areas could potentially pose adaptability challenges for extant life. Still, habitable planets in circumbinary systems appear to be remarkably resilient against circumbinary‐driven climate variations and can avoid any true climate catastrophes.

中文翻译：

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围绕恒星的宜居气候的复原力

在这里，我们使用3D气候系统模型研究在环绕系统中运行的类地球行星的可居住性。在最极端的情况下，外行星系统中的类地球行星可能会在约100天的时间尺度上发生高达约50％的入射恒星通量变化。但是，我们发现，与海洋驱动变化相对较短的时期相比，由于海洋的高热惯性，具有丰富地表液态水的类地行星通常可以有效地缓冲这些随时间变化的恒星辐射变化。在收到的恒星通量中。海洋表面温度几乎没有时间变化。但是，陆地表面温度可能会发生适度的变化，因此表现出由周围变化驱动的气候变化的其他模式。仍然，只有在恒星通量变化中物理上可能具有最大振幅的环行系统结构中，才发现有意义的表面温度振荡。在最极端的情况下，类似地球的行星在全球平均陆地表面温度可能高达〜5 K的情况下受到环境变化的驱动，而在季节性时标上，白天的最高白天温度的变化则高达〜12K。全球平均海洋温度变化不到2K。陆地上的这种季节性温度波动可能对现存生命构成适应性挑战。尽管如此，环生系统中的可居住行星似乎对环生驱动的气候变化具有显着的抵抗力，并且可以避免任何真正的气候灾难。