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- W3136133996 abstract "Abstract Data suggest that most rocky exoplanets with orbital period p < 100 days (“hot” rocky exoplanets) formed as gas-rich sub-Neptunes that subsequently lost most of their envelopes, but whether these rocky exoplanets still have atmospheres is unknown. We identify a pathway by which 1–1.7 R ⊕ (1–10 M ⊕ ) rocky exoplanets with orbital periods of 10–100 days can acquire long-lived 10–2000 bar atmospheres that are H 2 O-dominated, with mean molecular weight >10. These atmospheres form during the planets’ evolution from sub-Neptunes into rocky exoplanets. H 2 O that is made by reduction of iron oxides in the silicate magma is highly soluble in the magma, forming a dissolved reservoir that is protected from loss so long as the H 2 -dominated atmosphere persists. The large size of the dissolved reservoir buffers the H 2 O atmosphere against loss after the H 2 has dispersed. Within our model, a long-lived, water-dominated atmosphere is a common outcome for efficient interaction between a nebula-derived atmosphere (peak atmosphere mass fraction 0.1–0.6 wt%) and oxidized magma (>5 wt% FeO), followed by atmospheric loss. This idea predicts that most rocky planets that have orbital periods of 10–100 days and that have radii within 0.1–0.2 R ⊕ of the lower edge of the radius valley still retain H 2 O atmospheres. This prediction is imminently testable with James Webb Space Telescope and has implications for the interpretation of data for transiting super-Earths." @default.
- W3136133996 created "2021-03-29" @default.
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- W3136133996 date "2021-03-01" @default.
- W3136133996 modified "2023-10-12" @default.
- W3136133996 title "Water on Hot Rocky Exoplanets" @default.
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- W3136133996 doi "https://doi.org/10.3847/2041-8213/abe7dc" @default.
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