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- W1986679848 abstract "Short-period exoplanets can have dayside surface temperatures surpassing 2000 K, hot enough to vaporize rock and drive a thermal wind. Small enough planets evaporate completely. We construct a radiative hydrodynamic model of atmospheric escape from strongly irradiated, low-mass rocky planets, accounting for dust–gas energy exchange in the wind. Rocky planets with masses ≲ 0.1 M⊕ (less than twice the mass of Mercury) and surface temperatures ≳2000 K are found to disintegrate entirely in ≲10 Gyr. When our model is applied to Kepler planet candidate KIC 12557548b – which is believed to be a rocky body evaporating at a rate of |$dot{M} gtrsim 0.1 ,{rm M}_{rm {{oplus }}}$| Gyr−1 – our model yields a present-day planet mass of ≲ 0.02 M⊕ or less than about twice the mass of the Moon. Mass-loss rates depend so strongly on planet mass that bodies can reside on close-in orbits for Gyr with initial masses comparable to or less than that of Mercury, before entering a final short-lived phase of catastrophic mass-loss (which KIC 12557548b has entered). Because this catastrophic stage lasts only up to a few per cent of the planet's life, we estimate that for every object like KIC 12557548b, there should be 10–100 close-in quiescent progenitors with sub-day periods whose hard-surface transits may be detectable by Kepler – if the progenitors are as large as their maximal, Mercury-like sizes (alternatively, the progenitors could be smaller and more numerous). According to our calculations, KIC 12557548b may have lost ∼70 per cent of its formation mass; today we may be observing its naked iron core." @default.
- W1986679848 created "2016-06-24" @default.
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- W1986679848 date "2013-06-12" @default.
- W1986679848 modified "2023-10-18" @default.
- W1986679848 title "Catastrophic evaporation of rocky planets" @default.
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- W1986679848 doi "https://doi.org/10.1093/mnras/stt895" @default.
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