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Convective overshoot and macroscopic diffusion in pure-hydrogen-atmosphere white dwarfs
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Cunningham, T. J., Tremblay, Pier-Emmanuel, Freytag, Bernd, Ludwig, Hans-Günter and Koester, Detlev (2019) Convective overshoot and macroscopic diffusion in pure-hydrogen-atmosphere white dwarfs. Monthly Notices of the Royal Astronomical Society, 488 (2). pp. 2503-2522. doi:10.1093/mnras/stz1759
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Official URL: https://doi.org/10.1093/mnras/stz1759
Abstract
Abstract We present a theoretical description of macroscopic diffusion caused by convective overshoot in pure-hydrogen DA white dwarfs using 3D, closed-bottom, radiation hydrodynamics co5bold simulations. We rely on a new grid of deep 3D white dwarf models in the temperature range $11\, 400 \le T_{\mathrm{eff}} \le 18\, 000$ K where tracer particles and a tracer density are used to derive macroscopic diffusion coefficients driven by convective overshoot. These diffusion coefficients are compared to microscopic diffusion coefficients from 1D structures. We find that the mass of the fully mixed region is likely to increase by up to 2.5 orders of magnitude while inferred accretion rates increase by a more moderate order of magnitude. We present evidence that an increase in settling time of up to 2 orders of magnitude is to be expected, which is of significance for time-variability studies of polluted white dwarfs. Our grid also provides the most robust constraint on the onset of convective instabilities in DA white dwarfs to be in the effective temperature range from 18 000 to 18 250 K.
| Item Type: | Journal Article | ||||||||||||
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| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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| Divisions: | Faculty of Science > Physics | ||||||||||||
| SWORD Depositor: | Library Publications Router | ||||||||||||
| Library of Congress Subject Headings (LCSH): | White dwarf stars , Convection (Astrophysics), Hydrodynamics | ||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||
| Publisher: | Oxford University Press (OUP) | ||||||||||||
| ISSN: | 1365-2966 | ||||||||||||
| Official Date: | September 2019 | ||||||||||||
| Dates: |
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| Date of first compliant deposit: | 21 November 2019 | ||||||||||||
| Volume: | 488 | ||||||||||||
| Number: | 2 | ||||||||||||
| Page Range: | pp. 2503-2522 | ||||||||||||
| DOI: | 10.1093/mnras/stz1759 | ||||||||||||
| Status: | Peer Reviewed | ||||||||||||
| Publication Status: | Published | ||||||||||||
| Publisher Statement: | This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Tim Cunningham, Pier-Emmanuel Tremblay, Bernd Freytag, Hans-Günter Ludwig, Detlev Koester, Convective overshoot and macroscopic diffusion in pure-hydrogen-atmosphere white dwarfs, Monthly Notices of the Royal Astronomical Society, Volume 488, Issue 2, September 2019, Pages 2503–2522, is available online at:https://doi.org/10.1093/mnras/stz1759 | ||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||
| RIOXX Funder/Project Grant: |
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