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Exoplanetary oxygen fugacities from polluted white dwarf stars

Published online by Cambridge University Press:  09 October 2020

Alexandra E. Doyle Open the ORCID record for Alexandra E. Doyle [Opens in a new window] ,
Beth Klein ,
Ben Zuckerman ,
Hilke E. Schlichting  and
Edward D. Young
Alexandra E. Doyle
Affiliation:
Earth, Planetary, and Space Sciences, University of California, Los Angeles email: [email protected]
Beth Klein
Affiliation:
Physics and Astronomy, University of California, Los Angeles
Ben Zuckerman
Affiliation:
Physics and Astronomy, University of California, Los Angeles
Hilke E. Schlichting
Affiliation:
Earth, Planetary, and Space Sciences, University of California, Los Angeles email: [email protected] Physics and Astronomy, University of California, Los Angeles Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology
Edward D. Young
Affiliation:
Earth, Planetary, and Space Sciences, University of California, Los Angeles email: [email protected]
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Abstract

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The intrinsic oxygen fugacity of a planet profoundly influences a variety of its geochemical and geophysical aspects. Most rocky bodies in our solar system formed with oxygen fugacities approximately five orders of magnitude higher than that corresponding to a hydrogen-rich gas of solar composition. Here we derive oxygen fugacities of extrasolar rocky bodies from the elemental abundances in 15 white dwarf (WD) stars polluted by accretion of rocks. We find that the intrinsic oxygen fugacities of rocks accreted by the WDs are similar to those of terrestrial planets and asteroids in our solar system. This result suggests that at least some rocky exoplanets are geophysically and geochemically similar to Earth.

Keywords

white dwarfsplanetary systems
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S357: White Dwarfs as Probes of Fundamental Physics: Tracers of Planetary, Stellar and Galactic Evolution , October 2019 , pp. 28 - 32
Copyright
© International Astronomical Union 2020

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