edu.ucar.opensky::articles:21248 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T02:24:04.008529 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7rj4n36 The dehydration of water worlds via atmospheric losses 2017-09-14T00:00:00Z publication https://n2t.org/ark:/85065/d7rj4n36 https://doi.org/10.3847/2041-8213/aa8a60 Dong, Chuanfei author Huang, Z. author Lingam, M. author Tóth, G. author Gombosi, T. author Bhattacharjee, A. author UCAR/NCAR - Library publisher We present a three-species multi-fluid magnetohydrodynamic model (H+, H2O+, and e(-)), endowed with the requisite atmospheric chemistry, that is capable of accurately quantifying the magnitude of water ion losses from exoplanets. We apply this model to a water world with Earth-like parameters orbiting a Sun-like star for three cases: (i) current normal solar wind conditions, (ii) ancient normal solar wind conditions, and (iii) one extreme "Carrington-type" space weather event. We demonstrate that the ion escape rate for (ii), with a value of 6.0 x 10(26) s(-1), is about an order of magnitude higher than the corresponding value of 6.7 x 10(25) s(-1) for (i). Studies of ion losses induced by space weather events, where the ion escape rates can reach similar to 1028 s(-1), are crucial for understanding how an active, early solar-type star (e.g., with frequent coronal mass ejections) could have accelerated the depletion of the exoplanet's atmosphere. We briefly explore the ramifications arising from the loss of water ions, especially for planets orbiting M-dwarfs where such effects are likely to be significant. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2017 the American Astronomical Society. None eng geoscientificInformation