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- W2464774554 abstract "Approximately $0.2 pm 0.2$ of white dwarfs (WDs) show signs of pollution by metals, which is likely due to the accretion of tidally disrupted planetary material. Models invoking planet-planet interactions after WD formation generally cannot explain pollution at cooling times of several Gyr. We consider a scenario in which a planet is perturbed by Lidov-Kozai oscillations induced by a binary companion and exacerbated by stellar mass loss, explaining pollution at long cooling times. Our computed accretion rates are consistent with observations assuming planetary masses between $sim 0.01$ and $1,M_mathrm{Mars}$, although nongravitational effects may already be important for masses $lesssim 0.3 , M_mathrm{Mars}$. The fraction of polluted WDs in our simulations, $sim 0.05$, is consistent with observations of WDs with intermediate cooling times between $sim 0.1$ and 1 Gyr. For cooling times $lesssim 0.1$ Gyr and $gtrsim 1$ Gyr, our scenario cannot explain the high observed pollution fractions of up to 0.7. Nevertheless, our results motivate searches for companions around polluted WDs." @default.
- W2464774554 created "2016-07-22" @default.
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- W2464774554 date "2016-07-07" @default.
- W2464774554 modified "2023-09-26" @default.
- W2464774554 title "White dwarf pollution by planets in stellar binaries" @default.
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- W2464774554 doi "https://doi.org/10.1093/mnrasl/slw134" @default.
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