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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 ISSN 1365-2966.

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Official URL: https://doi.org/10.1093/mnras/stz1759

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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
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > 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:
DateEvent
September 2019Published
1 July 2019Available
25 June 2019Accepted
Volume: 488
Number: 2
Page Range: pp. 2503-2522
DOI: 10.1093/mnras/stz1759
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): 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
Date of first compliant deposit: 21 November 2019
Date of first compliant Open Access: 21 November 2019
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
677706 (WD3D)[ERC] Horizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
Sonderforschungsbereich SFB 88[DFG] Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
PHY-1748958National Science Foundationhttp://dx.doi.org/10.13039/100000001

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