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Title: White dwarf pollution by hydrated planetary remnants: hydrogen and metals in WD J204713.76–125908.9

Abstract

ABSTRACT WD J204713.76–125908.9 is a new addition to the small class of white dwarfs with helium-dominated photospheres that exhibit strong Balmer absorption lines and atmospheric metal pollution. The exceptional abundances of hydrogen observed in these stars may be the result of accretion of water-rich rocky bodies. We obtained far-ultraviolet and optical spectroscopy of WD J204713.76–125908.9 using the Cosmic Origin Spectrograph on-board the Hubble Space Telescope and X-shooter on the Very Large Telescope, and identify photospheric absorption lines of nine metals: C, O, Mg, Si, P, S, Ca, Fe, and Ni. The abundance ratios are consistent with the steady-state accretion of exo-planetesimal debris rich in the volatile elements carbon and oxygen, and the transitional element sulphur, by factors of 17, 2, and 4, respectively, compared to the bulk Earth. The parent body has a composition akin to Solar system carbonaceous chondrites, and the inferred minimum mass, 1.6 × 1020 g, is comparable to an asteroid 23 km in radius. We model the composition of the disrupted parent body, finding from our simulations a median water mass fraction of 8 per cent.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [3];  [4];  [5]; ORCiD logo [2]; ORCiD logo [6];  [7];  [2];  [5]; ORCiD logo [6]
  1. Department of Physics, University of Warwick, Coventry CV4 7AL, UK, Centre for Exoplanets and Habitability, University of Warwick, Coventry CV4 7AL, UK
  2. Department of Physics, University of Warwick, Coventry CV4 7AL, UK
  3. Dr. Remeis-Sternwarte & ECAP, Friedrich-Alexander Universität Erlangen-Nürnberg, Sternwartstr 7, D-96049 Bamberg, Germany, Departament de Fìsica, Universitat Politécnica de Catalunya, c/Esteve Terrades 5, E-08860 Castelldefels, Spain
  4. Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität, D-24118 Kiel, Germany
  5. Department of Physics, University of Warwick, Coventry CV4 7AL, UK, European Southern Observatory, Karl Schwarzschild Straße 2, Garching D-85748, Germany
  6. Department of Physics & Astronomy, University College London, London WC1E 6BT, UK
  7. Blackett Laboratory, Physics Department, Imperial College London, London SW7 2AZ, UK
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1670813
Resource Type:
Journal Article: 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: 499 Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Hoskin, Matthew J., Toloza, Odette, Gänsicke, Boris T., Raddi, Roberto, Koester, Detlev, Pala, Anna F., Manser, Christopher J., Farihi, Jay, Belmonte, Maria Teresa, Hollands, Mark, Gentile Fusillo, Nicola, and Swan, Andrew. White dwarf pollution by hydrated planetary remnants: hydrogen and metals in WD J204713.76–125908.9. United Kingdom: N. p., 2020. Web. doi:10.1093/mnras/staa2717.
Hoskin, Matthew J., Toloza, Odette, Gänsicke, Boris T., Raddi, Roberto, Koester, Detlev, Pala, Anna F., Manser, Christopher J., Farihi, Jay, Belmonte, Maria Teresa, Hollands, Mark, Gentile Fusillo, Nicola, & Swan, Andrew. White dwarf pollution by hydrated planetary remnants: hydrogen and metals in WD J204713.76–125908.9. United Kingdom. doi:10.1093/mnras/staa2717.
Hoskin, Matthew J., Toloza, Odette, Gänsicke, Boris T., Raddi, Roberto, Koester, Detlev, Pala, Anna F., Manser, Christopher J., Farihi, Jay, Belmonte, Maria Teresa, Hollands, Mark, Gentile Fusillo, Nicola, and Swan, Andrew. Wed . "White dwarf pollution by hydrated planetary remnants: hydrogen and metals in WD J204713.76–125908.9". United Kingdom. doi:10.1093/mnras/staa2717.
@article{osti_1670813,
title = {White dwarf pollution by hydrated planetary remnants: hydrogen and metals in WD J204713.76–125908.9},
author = {Hoskin, Matthew J. and Toloza, Odette and Gänsicke, Boris T. and Raddi, Roberto and Koester, Detlev and Pala, Anna F. and Manser, Christopher J. and Farihi, Jay and Belmonte, Maria Teresa and Hollands, Mark and Gentile Fusillo, Nicola and Swan, Andrew},
abstractNote = {ABSTRACT WD J204713.76–125908.9 is a new addition to the small class of white dwarfs with helium-dominated photospheres that exhibit strong Balmer absorption lines and atmospheric metal pollution. The exceptional abundances of hydrogen observed in these stars may be the result of accretion of water-rich rocky bodies. We obtained far-ultraviolet and optical spectroscopy of WD J204713.76–125908.9 using the Cosmic Origin Spectrograph on-board the Hubble Space Telescope and X-shooter on the Very Large Telescope, and identify photospheric absorption lines of nine metals: C, O, Mg, Si, P, S, Ca, Fe, and Ni. The abundance ratios are consistent with the steady-state accretion of exo-planetesimal debris rich in the volatile elements carbon and oxygen, and the transitional element sulphur, by factors of 17, 2, and 4, respectively, compared to the bulk Earth. The parent body has a composition akin to Solar system carbonaceous chondrites, and the inferred minimum mass, 1.6 × 1020 g, is comparable to an asteroid 23 km in radius. We model the composition of the disrupted parent body, finding from our simulations a median water mass fraction of 8 per cent.},
doi = {10.1093/mnras/staa2717},
journal = {Monthly Notices of the Royal Astronomical Society},
issn = {0035-8711},
number = 1,
volume = 499,
place = {United Kingdom},
year = {2020},
month = {9}
}

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