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Communication Dans Un Congrès Année : 2022

Atmospheric escape rates from Mars – if it orbited an M Dwarf star

François Leblanc

Résumé

As far as we know, all life requires liquid water. Liquid water at the surface of a planet is only possible when the planet has an atmosphere. But atmospheres of planets can change with time. In some cases, particles from atmospheres of planets can escape the planet entirely, driven away to space through interactions with the light and particles from the star that the planet orbits. Spacecraft orbiting Mars have measured the different ways that atmosphere can escape to space, providing useful information about how escape would work in any circumstances. This information is of particular interest for planets orbiting other stars - if we understood which of these planets could hold on to their atmospheres then we could constrain which kinds of planets might be able to support life at their surface. At present, many planets are being discovered orbiting stars that are smaller and cooler than our own Sun. This presentation imagines that Mars has been placed into orbit around one of these smaller cooler stars. Our team uses observations of a small, cool star to drive computer models of how the atmosphere escapes from Mars. We then estimate how long the atmosphere would last.
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Dates et versions

insu-04476680 , version 1 (25-02-2024)

Identifiants

Citer

A. Brain Dave, K. Peterson William, Ofer Cohen, Thomas Cravens, Hilary Egan, et al.. Atmospheric escape rates from Mars – if it orbited an M Dwarf star. The Astrobiology Science Conference (AbSciCon) 2022, May 2022, Atlanta, United States. pp.id. 507-07. ⟨insu-04476680⟩
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