Hydrogen emission from accretion and outflow in T Tauri stars
dc.contributor.author | Wilson, TJG | |
dc.contributor.author | Matt, S | |
dc.contributor.author | Harries, TJ | |
dc.contributor.author | Herczeg, GJ | |
dc.date.accessioned | 2022-05-18T12:25:58Z | |
dc.date.issued | 2022-05-20 | |
dc.date.updated | 2022-05-18T10:19:39Z | |
dc.description.abstract | Radiative transfer modelling offers a powerful tool for understanding the enigmatic hydrogen emission lines from T Tauri stars. This work compares optical and near-IR spectroscopy of 29 T Tauri stars with our grid of synthetic line profiles. The archival spectra, obtained with VLT's X-Shooter, provide simultaneous coverage of many optical and infrared hydrogen lines. The observations exhibit similar morphologies of line profiles seen in other studies. We used the radiative transfer code TORUS to create synthetic Hα, Paβ, Paγ, and Brγ emission lines for a fiducial T Tauri model that included axisymmetric magnetospheric accretion and a polar stellar wind. The distribution of Reipurth types and line widths for the synthetic Hα lines is similar to the observed results. However, the modelled infrared lines are narrower than the observations by ≈80 kms−1, and our models predict a significantly higher proportion (≈90 per cent) of inverse P-Cygni profiles. Furthermore, our radiative transfer models suggest that the frequency of P-Cygni profiles depends on the ratio of the mass loss to mass accretion rates and blue-shifted sub-continuum absorption was predicted for mass loss rates as low as 10−12 M⊙ yr−1. We explore the effect of rotation, turbulence, and the contributions from red-shifted absorption in an attempt to explain the discrepancy in widths. Our findings show that, singularly, none of these effects is sufficient to explain the observed disparity. However, a combination of rotation, turbulence, and non-axisymmetric accretion may improve the fit of the models to the observed data | en_GB |
dc.description.sponsorship | European Commission | en_GB |
dc.identifier.citation | Published online 20 May 2022 | en_GB |
dc.identifier.doi | 10.1093/mnras/stac1397 | |
dc.identifier.grantnumber | 682393 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/129672 | |
dc.language.iso | en | en_GB |
dc.publisher | Oxford University Press / Royal Astronomical Society | en_GB |
dc.relation.url | https://archive.eso.org/scienceportal/home | en_GB |
dc.relation.url | http://www.astro.ex.ac.uk/people/th2/torus_html/homepage.html | en_GB |
dc.rights | © The Author(s) 2022. Published by Oxford University Press on behalf of The Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. | |
dc.subject | Radiative transfer | en_GB |
dc.subject | line: formation | en_GB |
dc.subject | accretion, accretion discs | en_GB |
dc.subject | stars: winds, outflows | en_GB |
dc.subject | stars: pre-main-sequence | en_GB |
dc.subject | stars: variables: T Tauri, Herbig Ae/Be | en_GB |
dc.title | Hydrogen emission from accretion and outflow in T Tauri stars | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2022-05-18T12:25:58Z | |
dc.identifier.issn | 0035-8711 | |
dc.description | This is the author accepted manuscript. The final version is available on open access from Oxford University Press via the DOI in this record | en_GB |
dc.description | Data availability: The VLT/X-Shooter observations are available in the ESO Science Archive Facility at https://archive.eso.org/ scienceportal/home under the program ID 084.C-1095(A). The radiative transfer data underlying this article was generated using the code TORUS which can be found at http://www.astro.ex. ac.uk/people/th2/torus_html/homepage.html. | en_GB |
dc.identifier.eissn | 1365-2966 | |
dc.identifier.journal | Monthly Notices of the Royal Astronomical Society | en_GB |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | en_GB |
dcterms.dateAccepted | 2022-05-17 | |
rioxxterms.version | AM | en_GB |
rioxxterms.licenseref.startdate | 2022-05-17 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2022-05-18T10:19:44Z | |
refterms.versionFCD | AM | |
refterms.dateFOA | 2022-05-25T14:55:31Z | |
refterms.panel | B | en_GB |
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Except where otherwise noted, this item's licence is described as © The Author(s) 2022. Published by Oxford University Press on behalf of The Royal Astronomical Society.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.