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Atmosphere loss of Barnard’s Star planets, under various assumptions of planet masses, bulk densities, and initial atmospheric mass fraction. The mass range tested for a given planet is between its minimum mass (based on RV data; B25) and 2.5 times the minimum mass (see Section 2). The bulk densities ρ, used to calculate planet radius in the evolution models, span a liberal range: the Solar system rocky planets have densities between 3.93 g cm−3 (Mars) and 5.51 g cm−3 (Earth). No matter what assumptions are made, the planets are completely stripped of their atmospheres within 2 Gyr. The atmospheres survive longer if the planets are more massive, denser, farther from the star, and begin with a larger atmospheric mass fraction. - MNRAS

Planets Orbiting Barnard’s Star Seem To Be Small, Strange, And Utterly Uninhabitable

by Keith CowingJuly 16, 2026July 16, 2026

[University of Cambridge] Scientists have painted the most detailed portrait yet of the planetary system orbiting Barnard’s Star – the Sun’s closest neighbour after Alpha Centauri, just under six light-years […]

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Planets Orbiting Barnard’s Star Seem To Be Small, Strange, And Utterly Uninhabitable

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