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- W4383720909 abstract "Abstract The first interstellar object observed in our solar system, 1I/‘Oumuamua, exhibited several peculiar properties, including extreme elongation and nongravitational acceleration. Bergner & Seligman (hereafter BS23) proposed that evaporation of trapped H 2 created by cosmic rays can explain the nongravitational acceleration. However, their modeling of the thermal structure of 1I/‘Oumuamua ignored the crucial cooling effect of evaporating H 2 . By taking into account the cooling by H 2 evaporation, we show that the surface temperature of H 2 -water ice is a factor of 9 lower than the case without evaporative cooling. As a result, the thermal speed of outgassing H 2 is decreased by a factor of 3. Our one-dimensional thermal modeling that takes into account evaporative cooling for two chosen values of thermal conductivity of κ = 0.01 and 0.1 WK −1 m −1 shows that the water ice volume available for H 2 sublimation at T > 30 K would be reduced by a factor of 9 and 5 compared to the results of BS23, not enabling enough hydrogen to propel 1I/‘Oumuamua." @default.
- W4383720909 created "2023-07-11" @default.
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- W4383720909 date "2023-07-01" @default.
- W4383720909 modified "2023-09-25" @default.
- W4383720909 title "Implications of Evaporative Cooling by H<sub>2</sub> for 1I/‘Oumuamua" @default.
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- W4383720909 doi "https://doi.org/10.3847/2041-8213/acdf57" @default.
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