High-resolution [O i] line spectral mapping of TW Hya consistent with X-ray-driven photoevaporation
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Published version
Author(s)
Rab, Christian
Weber, Michael L
Picogna, Giovanni
Ercolano, Barbara
Owen, James E
Type
Journal Article
Abstract
Theoretical models indicate that photoevaporative and magnetothermal winds play a crucial role in the evolution and dispersal of protoplanetary disks and affect the formation of planetary systems. However, it is still unclear what wind-driving mechanism is dominant or if both are at work, perhaps at different stages of disk evolution. Recent spatially resolved observations by Fang et al. of the [O i] 6300 Å spectral line, a common disk wind tracer in TW Hya, revealed that about 80% of the emission is confined to the inner few astronomical units of the disk. In this work, we show that state-of-the-art X-ray-driven photoevaporation models can reproduce the compact emission and the line profile of the [O i] 6300 Å line. Furthermore, we show that the models also simultaneously reproduce the observed line luminosities and detailed spectral profiles of both the [O i] 6300 Å and the [Ne ii] 12.8 μm lines. While MHD wind models can also reproduce the compact radial emission of the [O i] 6300 Å line, they fail to match the observed spectral profile of the [O i] 6300 Å line and underestimate the luminosity of the [Ne ii] 12.8 μm line by a factor of 3. We conclude that, while we cannot exclude the presence of an MHD wind component, the bulk of the wind structure of TW Hya is predominantly shaped by a photoevaporative flow.
Date Issued
2023-09-20
Date Acceptance
2023-08-30
Citation
Letters of the Astrophysical Journal, 2023, 955 (1)
ISSN
2041-8205
Publisher
IOP Publishing
Journal / Book Title
Letters of the Astrophysical Journal
Volume
955
Issue
1
Copyright Statement
© 2023. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms
of the Creative Commons Attribution 4.0 licence. Any further
distribution of this work must maintain attribution to the author(s) and the title
of the work, journal citation and DOI.
of the Creative Commons Attribution 4.0 licence. Any further
distribution of this work must maintain attribution to the author(s) and the title
of the work, journal citation and DOI.
License URL
Identifier
http://dx.doi.org/10.3847/2041-8213/acf574
Publication Status
Published
Article Number
L11
Date Publish Online
2023-09-20