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- W3028620190 abstract "Low-gravity waterworlds ($Mlesssim 0.1 M_{oplus}$) are of interest for their potential habitability. The weakly bound atmospheres of such worlds have proportionally larger radiative surfaces and are more susceptible to escape. We conduct a unified investigation into these phenomena, combining analytical energy balance and hydrodynamic escape with line-by-line radiative transfer calculations. Because outgoing radiation is forced to increase with surface temperature by the expansion of the radiative surface, we find that these worlds do not experience a runaway greenhouse. Furthermore, we show that a long-lived liquid water habitable zone is possible for low-gravity waterworlds of sufficient mass. Its inner edge is set by the rate of atmospheric escape, because a short-lived atmosphere limits the time available for life to evolve. In describing the physics of the parameter space transition from planet-like to comet-like, our model produces a lower bound for habitability in terms of gravity. These results provide valuable insights in the context of the ongoing hunt for habitable exoplanets and exomoons." @default.
- W3028620190 created "2020-06-05" @default.
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- W3028620190 date "2018-12-01" @default.
- W3028620190 modified "2023-09-23" @default.
- W3028620190 title "Atmospheric Evolution on Low-Gravity Waterworlds" @default.
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