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Structure and density of silicon carbide to 1.5 TPa and implications for extrasolar planets

Author

Listed:
  • D. Kim

    (Princeton University)

  • R. F. Smith

    (Lawrence Livermore National Laboratory)

  • I. K. Ocampo

    (Princeton University)

  • F. Coppari

    (Lawrence Livermore National Laboratory)

  • M. C. Marshall

    (University of Rochester)

  • M. K. Ginnane

    (University of Rochester)

  • J. K. Wicks

    (Johns Hopkins University)

  • S. J. Tracy

    (Carnegie Institution for Science)

  • M. Millot

    (Lawrence Livermore National Laboratory)

  • A. Lazicki

    (Lawrence Livermore National Laboratory)

  • J. R. Rygg

    (University of Rochester)

  • J. H. Eggert

    (Lawrence Livermore National Laboratory)

  • T. S. Duffy

    (Princeton University)

Abstract

There has been considerable recent interest in the high-pressure behavior of silicon carbide, a potential major constituent of carbon-rich exoplanets. In this work, the atomic-level structure of SiC was determined through in situ X-ray diffraction under laser-driven ramp compression up to 1.5 TPa; stresses more than seven times greater than previous static and shock data. Here we show that the B1-type structure persists over this stress range and we have constrained its equation of state (EOS). Using this data we have determined the first experimentally based mass-radius curves for a hypothetical pure SiC planet. Interior structure models are constructed for planets consisting of a SiC-rich mantle and iron-rich core. Carbide planets are found to be ~10% less dense than corresponding terrestrial planets.

Suggested Citation

  • D. Kim & R. F. Smith & I. K. Ocampo & F. Coppari & M. C. Marshall & M. K. Ginnane & J. K. Wicks & S. J. Tracy & M. Millot & A. Lazicki & J. R. Rygg & J. H. Eggert & T. S. Duffy, 2022. "Structure and density of silicon carbide to 1.5 TPa and implications for extrasolar planets," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29762-y
    DOI: 10.1038/s41467-022-29762-y
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    References listed on IDEAS

    as
    1. A. Lazicki & D. McGonegle & J. R. Rygg & D. G. Braun & D. C. Swift & M. G. Gorman & R. F. Smith & P. G. Heighway & A. Higginbotham & M. J. Suggit & D. E. Fratanduono & F. Coppari & C. E. Wehrenberg & , 2021. "Metastability of diamond ramp-compressed to 2 terapascals," Nature, Nature, vol. 589(7843), pages 532-535, January.
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