Photoevaporation from Inner Protoplanetary Disks Confronted with Observations
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866917957357010944 |
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| author | Lin, Yiren Wang, Lile Fang, Min Nemer, Ahmad Goodman, Jeremy |
| author_facet | Lin, Yiren Wang, Lile Fang, Min Nemer, Ahmad Goodman, Jeremy |
| contents | The decades-long explorations on the dispersal of protoplanetary disks involve many debates about photoevaporation versus magnetized wind launching mechanisms. This letter argues that the observed winds originating from the inner disk ($R\lesssim 0.3$ AU) cannot be explained by the photoevaporative mechanism. Energy conservation requires the presumed photoevaporative winds to be heated to $\gtrsim 10^5$ K when launched from inner disks. However, due to efficient thermal accommodation with dust grains and cooling processes at high densities, X-ray irradiation at energies above 1 keV cannot efficiently launch winds in the first place because of its high penetration. Some studies claiming X-ray wind launching have oversimplified the thermochemical couplings. Furthermore, heating the gas to escape velocity will over-ionize it, suppressing the species responsible for observed forbidden lines (e.g., [OI] 6300 $Å$ ). Confirmed by semi-analytic integrations of thermochemical fluid structures, such high ionizations contradict the observed emission of neutral and singly-ionized atoms from the winds originating from the inner disks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_15419 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Photoevaporation from Inner Protoplanetary Disks Confronted with Observations Lin, Yiren Wang, Lile Fang, Min Nemer, Ahmad Goodman, Jeremy Earth and Planetary Astrophysics The decades-long explorations on the dispersal of protoplanetary disks involve many debates about photoevaporation versus magnetized wind launching mechanisms. This letter argues that the observed winds originating from the inner disk ($R\lesssim 0.3$ AU) cannot be explained by the photoevaporative mechanism. Energy conservation requires the presumed photoevaporative winds to be heated to $\gtrsim 10^5$ K when launched from inner disks. However, due to efficient thermal accommodation with dust grains and cooling processes at high densities, X-ray irradiation at energies above 1 keV cannot efficiently launch winds in the first place because of its high penetration. Some studies claiming X-ray wind launching have oversimplified the thermochemical couplings. Furthermore, heating the gas to escape velocity will over-ionize it, suppressing the species responsible for observed forbidden lines (e.g., [OI] 6300 $Å$ ). Confirmed by semi-analytic integrations of thermochemical fluid structures, such high ionizations contradict the observed emission of neutral and singly-ionized atoms from the winds originating from the inner disks. |
| title | Photoevaporation from Inner Protoplanetary Disks Confronted with Observations |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2401.15419 |