Role of Planetary Radius on Atmospheric Escape of Rocky Exoplanets

Author:

Chin LauraORCID,Dong ChuanfeiORCID,Lingam ManasviORCID

Abstract

Abstract Large-scale characterization of exoplanetary atmospheres is on the horizon, thereby making it possible in the future to extract their statistical properties. In this context, by using a well-validated model in the solar system, we carry out 3D magnetohydrodynamic simulations to compute nonthermal atmospheric ion escape rates of unmagnetized rocky exoplanets as a function of their radius based on fixed stellar radiation and wind conditions. We find that the atmospheric escape rate is, unexpectedly and strikingly, a nonmonotonic function of the planetary radius R and that it evinces a maximum at R ∼ 0.7 R . This novel nonmonotonic behavior may arise from an intricate trade-off between the cross-sectional area of a planet (which increases with size, boosting escape rates) and its associated escape velocity (which also increases with size but diminishes escape rates). Our results could guide forthcoming observations because worlds with certain values of R (such as R ∼ 0.7 R ) might exhibit comparatively higher escape rates when all other factors are constant.

Funder

National Aeronautics and Space Administration

Publisher

American Astronomical Society

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Atmospheric ion escape and solar wind deposition as a function of planetary radius;Monthly Notices of the Royal Astronomical Society;2024-09-02

2. Water Evolution and Inventories of Super-Earths Orbiting Late M Dwarfs;The Astrophysical Journal;2024-09-01

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