Characterizing habitable exoplanets and/or their moons is of paramount importance. Here we show the results of our magnetic field topological modeling, which demonstrate that terrestrial exoplanet–exomoon coupled magnetospheres work together to protect the early atmospheres of both the exoplanet and the exomoon. When exomoon magnetospheres are within the exoplanet's magnetospheric cavity, the exomoon magnetosphere acts like a protective magnetic bubble providing an additional magnetopause confronting the stellar winds when the moon is on the dayside. In addition, magnetic reconnection would create a critical pathway for the atmosphere exchange between the early exoplanet and exomoon. When the exomoon's magnetosphere is outside of the exoplanet's magnetosphere it then becomes the first line of defense against strong stellar winds, reducing the exoplanet's atmospheric loss to space. A brief discussion is given on how this type of exomoon would modify radio emissions from magnetized exoplanets.

表征可居住的系外行星和/或其卫星至关重要。在这里，我们展示了我们的磁场拓扑模型的结果，这表明陆地系外行星-系外卫星耦合磁层共同保护系外行星和系外卫星的早期大气。当系外行星的磁层位于系外行星的磁层腔内时，系外行星的磁层就像一个保护性磁泡，当月球位于白天时，它提供了一个额外的磁层顶以对抗恒星风。此外，磁重联将为早期系外行星和系外卫星之间的大气交换创造关键途径。当系外卫星的磁层位于系外行星的磁层之外时，它就成为抵御强恒星风的第一道防线，减少系外行星对太空的大气损失。简要讨论了这种类型的系外卫星将如何改变磁化系外行星的无线电发射。