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| Main Authors: | , , |
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| Format: | Preprint |
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2022
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| Online Access: | https://arxiv.org/abs/2202.02804 |
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| _version_ | 1866913273748652032 |
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| author | Komaki, Ayano Kuiper, Rolf Yoshida, Naoki |
| author_facet | Komaki, Ayano Kuiper, Rolf Yoshida, Naoki |
| contents | We perform radiation hydrodynamics simulations to study the structure and evolution of a photoevaporating protoplanetary disk. Ultraviolet and X-ray radiation from the host star heats the disk surface, where H$_2$ pumping also operates efficiently. We run a set of simulations with varying the amount of dust grains, or the dust-to-gas mass ratio, which determines the relative importance between photoelectric heating and H$_2$ pumping. We show that H$_2$ pumping and X-ray heating contribute stronger to the mass-loss of the disk if the dust-to-gas mass ratio is $\mathcal{D}\leq10^{-3}$.The disk mass loss rate decreases with a lower dust amount, but remains around $10^{-10-11} M_{\odot} {\rm yr}^{-1}$. In such dust-deficient disks, H$_2$ pumping enhances photoevaporation from the inner disk region and shapes the disk mass-loss profile. We thus argue that the late-stage disk evolution is affected by the ultra-violet H$_2$ pumping effect. The mass-loss rates derived from our simulations can be used in the study of long-term disk evolution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2202_02804 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | The effect of ultra-violet photon pumping of H$_2$ in dust-deficient protoplanetary disks Komaki, Ayano Kuiper, Rolf Yoshida, Naoki Earth and Planetary Astrophysics Solar and Stellar Astrophysics We perform radiation hydrodynamics simulations to study the structure and evolution of a photoevaporating protoplanetary disk. Ultraviolet and X-ray radiation from the host star heats the disk surface, where H$_2$ pumping also operates efficiently. We run a set of simulations with varying the amount of dust grains, or the dust-to-gas mass ratio, which determines the relative importance between photoelectric heating and H$_2$ pumping. We show that H$_2$ pumping and X-ray heating contribute stronger to the mass-loss of the disk if the dust-to-gas mass ratio is $\mathcal{D}\leq10^{-3}$.The disk mass loss rate decreases with a lower dust amount, but remains around $10^{-10-11} M_{\odot} {\rm yr}^{-1}$. In such dust-deficient disks, H$_2$ pumping enhances photoevaporation from the inner disk region and shapes the disk mass-loss profile. We thus argue that the late-stage disk evolution is affected by the ultra-violet H$_2$ pumping effect. The mass-loss rates derived from our simulations can be used in the study of long-term disk evolution. |
| title | The effect of ultra-violet photon pumping of H$_2$ in dust-deficient protoplanetary disks |
| topic | Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2202.02804 |