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Title: Hydrodynamic simulations of disrupted planetary accretion discs inside the core of an AGB star

Abstract

ABSTRACT Volume complete sky surveys provide evidence for a binary origin for the formation of isolated white dwarfs with magnetic fields in excess of a MegaGauss. Interestingly, not a single high-field magnetic white dwarf has been found in a detached system, suggesting that if the progenitors are indeed binaries, the companion must be removed or merge during formation. An origin scenario consistent with observations involves the engulfment, inspiral, and subsequent tidal disruption of a low-mass companion in the interior of a giant star during a common envelope phase. Material from the shredded companion forms a cold accretion disc embedded in the hot ambient around the proto-white dwarf. Entrainment of hot material may evaporate the disc before it can sufficiently amplify the magnetic field, which typically requires at least a few orbits of the disc. Using three-dimensional hydrodynamic simulations of accretion discs with masses between 1 and 10 times the mass of Jupiter inside the core of an Asymptotic Giant Branch star, we find that the discs survive for at least 10 orbits (and likely for 100 orbits), sufficient for strong magnetic fields to develop.

Authors:
 [1];  [2]; ORCiD logo [3]; ORCiD logo [4];  [3];  [3];  [5];  [5]
  1. Center for Computational Relativity and Gravitation, Rochester Institute of Technology, Rochester, NY 14623, USA
  2. Center for Computational Relativity and Gravitation, Rochester Institute of Technology, Rochester, NY 14623, USA, National Technical Institute for the Deaf, Rochester Institute of Technology, Rochester, NY 14623, USA
  3. Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA
  4. Department of Physics, University of Alberta, Edmonton, AB T6G 2E1, Canada
  5. Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA, Center for Integrated Research Computing, University of Rochester, Rochester, NY 14627, USA, Laboratory for Laser Energetics, University of Rochester, Rochester, NY 14623, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1570088
Grant/Contract Number:  
SC0001063
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 490 Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Guidarelli, G., Nordhaus, J., Chamandy, L., Chen, Z., Blackman, E. G., Frank, A., Carroll-Nellenback, J., and Liu, B. Hydrodynamic simulations of disrupted planetary accretion discs inside the core of an AGB star. United Kingdom: N. p., 2019. Web. doi:10.1093/mnras/stz2641.
Guidarelli, G., Nordhaus, J., Chamandy, L., Chen, Z., Blackman, E. G., Frank, A., Carroll-Nellenback, J., & Liu, B. Hydrodynamic simulations of disrupted planetary accretion discs inside the core of an AGB star. United Kingdom. doi:10.1093/mnras/stz2641.
Guidarelli, G., Nordhaus, J., Chamandy, L., Chen, Z., Blackman, E. G., Frank, A., Carroll-Nellenback, J., and Liu, B. Sat . "Hydrodynamic simulations of disrupted planetary accretion discs inside the core of an AGB star". United Kingdom. doi:10.1093/mnras/stz2641.
@article{osti_1570088,
title = {Hydrodynamic simulations of disrupted planetary accretion discs inside the core of an AGB star},
author = {Guidarelli, G. and Nordhaus, J. and Chamandy, L. and Chen, Z. and Blackman, E. G. and Frank, A. and Carroll-Nellenback, J. and Liu, B.},
abstractNote = {ABSTRACT Volume complete sky surveys provide evidence for a binary origin for the formation of isolated white dwarfs with magnetic fields in excess of a MegaGauss. Interestingly, not a single high-field magnetic white dwarf has been found in a detached system, suggesting that if the progenitors are indeed binaries, the companion must be removed or merge during formation. An origin scenario consistent with observations involves the engulfment, inspiral, and subsequent tidal disruption of a low-mass companion in the interior of a giant star during a common envelope phase. Material from the shredded companion forms a cold accretion disc embedded in the hot ambient around the proto-white dwarf. Entrainment of hot material may evaporate the disc before it can sufficiently amplify the magnetic field, which typically requires at least a few orbits of the disc. Using three-dimensional hydrodynamic simulations of accretion discs with masses between 1 and 10 times the mass of Jupiter inside the core of an Asymptotic Giant Branch star, we find that the discs survive for at least 10 orbits (and likely for 100 orbits), sufficient for strong magnetic fields to develop.},
doi = {10.1093/mnras/stz2641},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 490,
place = {United Kingdom},
year = {2019},
month = {9}
}

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This content will become publicly available on September 21, 2020
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