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arXiv · 1903.03123

Planetary Magnetism as a Parameter in Exoplanet Habitability

Sarah R. N. McIntyre·Charles H. Lineweaver·Michael J. Ireland
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Abstract

Evidence from the solar system suggests that, unlike Venus and Mars, the presence of a strong magnetic dipole moment on Earth has helped maintain liquid water on its surface. Therefore, planetary magnetism could have a significant effect on the long-term maintenance of atmosphere and liquid water on rocky exoplanets. We use Olson and Christensen's (2006) model to estimate magnetic dipole moments of rocky exoplanets with radii R${}_{p}$ $\le$ 1.23 R$_\oplus$. Even when modelling maximum magnetic dipole moments, only Kepler-186 f has a magnetic dipole moment larger than the Earth's, while approximately half of rocky exoplanets detected in the circumstellar habitable zone have a negligible magnetic dipole moment. This suggests that planetary magnetism is an important factor when prioritizing observations of potentially habitable planets.

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Sarah R. N. McIntyre, Charles H. Lineweaver, Michael J. Ireland. 2019-03-07. Planetary Magnetism as a Parameter in Exoplanet Habitability. https://doi.org/10.1093/mnras%2Fstz667

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